After prolonged sun exposure at high temperatures, the Denza N9's cabin will still heat up, but the aluminium full-cabin hard flooring can reduce foot-area heat and make post-exposure cleaning easier, making it less stressful when getting kids in and out. After off-roading on the Northwest plateau, focus on inspecting the front and rear footwells, the trunk trim closures and mounting points to decide whether an upgrade is needed.
Why does the footwell become the most uncomfortable area first after sun exposure?
After the Denza N9 sits in the sun on the Northwest plateau, the first discomfort usually comes not from above the dashboard but from the footwell. The windshield and side windows continuously feed solar heat into the cabin; the dashboard, center console and seat bases keep absorbing heat. Once heat from the powertrain is transmitted into the cabin, a noticeable stuffy heat builds up around the foot area. With strong plateau sunlight, this heat doesn't disappear immediately even after the air conditioning is turned off.
The footwell also dissipates heat slowly because of its low position and many obstructions. The front seat rails press down on the floor and the seat bases block airflow, so heat is hard to disperse from underfoot; once a child seat is installed, its base and rails take up even more space. When a child steps out with shoes on, the soles are close to the heated floor, a sensation more direct than touching the grab handle with a hand. If the factory carpet is retained, the structure beneath it stores heat, making the floor feel as if heat is pushing up from below.
When inspecting the car, don't focus only on how fast the AC cools. Park it in the sun for 30 minutes, then measure the front and second-row floor surface temperatures after opening the doors, and compare by holding the back of your hand near the seat bases and the floor, while also checking whether heat accumulates around the child seat base. When evaluating the aluminium full-cabin hard flooring, look at surface temperatures under the same sun exposure and the cool-down speed after closing the doors—don't be misled by the brief coolness when the door is first opened.
Plateau sun exposure plus range-extender heat load makes the footwell even worse
Building on the issue of the footwell being exposed first, the plateau adds another layer of heat load. After the Denza N9 is parked in the Gobi or at a gravel campsite, the sealed cabin keeps storing heat; even if the outside temperature is only in the low twenties Celsius, strong afternoon sunlight can raise temperatures in the cabin's upper area and near the sills. When the range extender recharges the battery, the powertrain continuously expels heat outward, and the cabin AC must additionally remove heat from the cabin. The front footwell sits in a semi-enclosed lower space where cool air may not replace the accumulated heat in time, and the cabin temperature reading may not reflect local heat sensation.
In a scenario at roughly 3000 meters altitude with air temperature near 30℃, after a short drive and half an hour of sun exposure while parked, the front floor receives heat passing through the glass and body as well as residual heat left by powertrain thermal management. The rear passageway and trunk are more affected by direct sun through the tailgate and side windows, so the heat distribution differs. For families with kids waiting in the car, with the child in the front seat and grandparents in the second row, the underfoot feeling is more direct than the AC vent temperature.
So when evaluating the thermal insulation of the full-cabin aluminium floor, don't rely only on the AC vents. Aluminum conducts heat quickly, and without continuous insulation underneath, heat will still travel up through contact surfaces; gaps at the edges also let sand, dust and hot air sneak in. The front footwell, rear passageway and trunk should be tested separately—record exposure duration, surface temperatures and where occupants sit—so a single average doesn't mask localized overheating.
Aluminium full-cabin hard flooring insulation is about more than temperature
Judging insulation cannot rely solely on how hot the floor surface gets after sun exposure. Aluminum conducts heat fast, and its surface can even heat up rapidly under direct sun; what really matters for the footwell is whether the heat flow is intercepted, how long the baking sensation lasts, and how fast the cabin temperature rises after closing the doors. Taking a single spot reading with an infrared gun only reflects the surface condition at that moment and cannot represent the flooring's overall insulation performance.
Aluminium full-cabin hard flooring isn't finished just by laying down aluminum panels. After removing the seats, check the wiring harnesses, drain holes and mounting points under the factory carpet, then complete base sealing, thermal bridging breaks, sound-deadening layers and trim finishing. HPL lamination provides surface wear resistance and easy cleaning but is not the same as an insulation layer; the aluminum panels, air gaps, edge wrapping and locking clips must be viewed as one system—if a local thermal bridge is left untreated, even a low surface temperature can quickly pass heat into the cabin.
During inspection, don't accept a single temperature figure. After 2 hours of sun exposure, record the panel temperature and cabin air temperature, then observe the cool-down rate over 30 minutes of parking. Also verify the panel grade: 6061 can be called pure aluminum, but aerospace-grade 5052 cannot. For families with kids, whether the floor stays persistently hot under children's feet as they move front and back, and whether luggage gets heated, are more meaningful for judgment than a claim of "full-cabin insulation."
Inspect front footwell, rear footwell and trunk separately
For post-exposure acceptance, don't average temperatures across the front footwell, rear footwell and trunk. After the vehicle has been left outdoors on the plateau with windows closed for 2 hours of sun, first open the doors to ventilate and let it sit for 30 minutes, then use a contact thermometer at 3 points each in the driver's pedal area, rear footwell and trunk. Even if instrument readings are similar, panel surface temperatures may not be: the front is affected by sunlight and AC hot air, while the rear comes more from side-window and headliner heating.
Front and rear should also be checked separately. Up front, focus on whether there are lifted edges, trapped sand or abnormal noises near the accelerator and brake pedals; at the rear, press along the seat mounting holes, door sills and lower side panels section by section, confirming the locking clips are seated and the seam widths are consistent. After installing the child safety seat, recheck whether the interfaces interfere with the floor—don't just look at whether the surface is flat.
Inspect the trunk against real loading scenarios: after putting in luggage and a kids' scooter, check whether the aluminum panels warp, whether corners press against fasteners, and whether the locking clips loosen. In the sandy Northwest environment, vacuum first, then brush away sand with a soft brush, checking every seam for sand ingress and stiff movement. Verify the materials too: Yunluo corresponds to 6061 pure aluminum and aerospace aluminum to 5052—the grade must not mismatch the advertised name.
After Northwest off-roading, clear sand first, then check the trim closures
After returning from off-roading in the Northwest, don't rush to wipe the car down. Park on level ground in the shade, wait for the powertrain to cool, then open the front and rear doors. Use a vacuum with a flat nozzle to first clean inside the door sills, the front footwell, the second- and third-row footwells and the trunk corners, then sweep gently along the aluminum panel seams with a round-tipped plastic brush. If sand has lodged in the closures, dampen it with a cloth lightly moistened with neutral detergent, then remove it with a wrung-out cloth—avoid letting water pour directly into the seams. Fixed aluminum panels should only be surface cleaned; never lift whole panels to rinse them.
After cleaning, focus on the closures: check whether the edge wrapping where the front seats meet the sills has lifted, whether the locking clips are loose, and whether panel seams show lifted edges, bulges or abnormal hollow sounds. In the trunk, also check the side-wall trim and rear sill; repeated gravel impacts can leave burrs, chipped edges and localized shiny spots. Tighten anything loose first; if edges are already deformed, return to the shop for handling—don't hammer or bend them yourself.
The front footwell and door sills, which children touch most when getting in and out, should be re-inspected with priority, confirming there are no sharp edges, burrs or loose small parts. With heavy wind and sand in the Northwest, sand clearing and edge checking should be accepted separately—a clean-looking surface doesn't mean the closures are still secure.
4 things families with kids should check on pickup day
On pickup day with kids, don't just sniff for odors—crouch down and go over the floor. First check the aluminum panel surfaces and seams: walk along the front footwell and rear passageway, looking for lifted edges or burrs; the joints must not pinch a child's shoes. Then check the door sills and edge trim: open and close the doors two or three times; the trim must not push against your foot and the seals must not be compressed.
Also check the seat removal points and fixing locks. After reinstalling the seats, confirm they lock, and check around the bases for exposed holes or looseness; the floor must not obstruct the child seat base and its fixing interfaces. After folding each row of seats, check the floor transitions and trunk: roll a stroller back and forth twice—there must be no raised steps—and luggage placed inside must not scrape against the floor making noise.
For the full-cabin aluminium hard flooring version, also verify the closures under the front seats, at the rear sill edges and at the trunk entrance. After plateau sun exposure, prioritize checking for heat-expanded lifted edges and gaps after disassembly. Having a parent walk the passageway with a child twice often reveals pinched-foot spots more easily than an adult's test sitting.
Frequently Asked Questions
Q1: After the Denza N9 sits in the Northwest sun, will the footwell get so hot a child won't dare step out?
Usually it won't get hot enough that a child won't step out. After sun exposure the footwell temperature will rise, but the aluminium full-cabin hard flooring can reduce solar radiation entering, so the heat felt through shoe soles is relatively milder; after parking in high heat you should still ventilate and cool the cabin first, and never leave children alone inside.
Q2: How much solar heat can the aluminium full-cabin hard flooring block?
It cannot block all the heat, but it can block a considerable portion of solar radiation. Aluminum reflects radiation and the insulation layer slows heat transfer into the cabin, so after sun exposure the footwell and trunk usually heat up more slowly. The actual temperature rise is still affected by exposure duration, vehicle orientation, air conditioning and ventilation.
Q3: Can the hard flooring for the front rows, rear rows and trunk of the Denza N9 be installed as one integrated unit?
Yes, integrated installation is possible. The front and rear footwells, seat surroundings and trunk area can be laid out uniformly according to the vehicle's factory interior structure, with aluminium parts, fasteners and edge trim installed simultaneously, reducing seams and lifted edges. Locations involving the third-row rails, seat sliders and original vehicle functions need clearance reserved for service and adjustment.
Q4: For families with kids, which is better—the original carpet or the aluminium full-cabin hard flooring?
Families with kids should choose the aluminium full-cabin hard flooring first. The original carpet feels comfortable but tends to accumulate heat and trap dirt after sun exposure, and liquid spills are troublesome to clean; aluminium hard flooring withstands high temperatures, wipes clean easily, and reduces cleaning and moisture problems. If underfoot feel matters more, you can keep the original carpet in certain zones and choose by area.
Q5: After installing the aluminium full-cabin hard flooring, will third-row seat adjustment be affected?
A proper installation will not affect third-row seat adjustment. The solution reserves complete space for seat sliders, clips and power adjustment mechanisms, and after installation each function is tested in turn: fore-aft movement, backrest adjustment and locking. If the model uses special fixing structures, it should be custom-made to the actual hole positions on the vehicle—never directly cover or modify the original mechanisms.
Four pitfalls to avoid when installing flooring
Subheading: "Non-destructive installation" doesn't mean zero modifications. Sellers often call "less disassembly, no glue" non-destructive, while owners understand it as "no wire cutting, no hole enlargement, no grinding." For this type of large SUV, when installing rear-row accessories there have been forum reports of removing the middle-row seats, grinding iron brackets with an angle grinder, enlarging screw holes, and tapping the factory wiring for power. Especially under Northwest sun exposure and plateau temperature swings, the risk of wiring faults after tapping power—and of warranty disputes—rises significantly. Countermeasure: confirm modifications in writing before ordering, and require that wiring be restorable and connectors serviceable.
Subheading: Rattles mostly hide in installation details. In forum feedback, the vast majority of issues are clips not pressed down firmly, patterns not matching, bottom support not properly padded leaving hollow cavities, and plastic rail trim covers warping at the edges due to thermal expansion and contraction. High-altitude bumps combined with temperature swings after intense sun exposure make loosening and gaps more noticeable. Countermeasure: after installation, check once with the car cold and once with it hot, press the clips and drive over a gravel road; if the pattern doesn't match, have it redone as soon as possible—don't just patch it with tape.
Subheading: Ask about low and high prices separately. The same footrest, pedal, or ambient lighting solution can vary greatly in price between cities and sales channels, and some charge extra for installation. A low price may bundle materials, fitment, and disassembly/reassembly together, while a high price may simply be channel markup. Countermeasure: have the seller itemize material costs, installation fees, channel and travel expenses in writing, then confirm whether reinstallation, fitment, and after-sales service are included—don't just compare the total price.
Subheading: More features mean more points of failure. Solutions with lighting, footrests, and ambient-light linkage usually add power taps, hidden wiring, and connectors, making troubleshooting more time-consuming. After off-road driving, mud and sand work in and out repeatedly, and sun exposure makes surface materials brittle; the most frequently used footrest and pedal areas easily turn white with wear and get scratched, and fabric textures can sag after long-term pressure. Countermeasure: prioritize keeping high-frequency functions, regularly check wire clips and gaps, and choose parts that are removable, washable, and easy to replace.
How to inspect on installation day
1. Match materials against the invoice. Check the floor's cross-section: a pure, translucent PE layer means virgin material; a dark, impurity-filled one means recycled material;
smell it for any pungent odor. Require the shop to write the aluminum layer grade and total thickness into the invoice—figures given verbally can't be verified afterward.
2. Rail linkage. Slide each row of seats back and forth several times, listening for stutters or abnormal noises; if you find a problem on the spot, demand reinstallation and recalibration immediately,
don't wait until you've driven the car home to come back for it. For cars with long seat travel like the Denza N9, this step especially cannot be skipped.
3. Edge finishing details. Crouch down and press along the rail ends, door sill corners, and side panels inch by inch, checking for gaps, lifted edges,
or inconsistent rebound when pressed. Edge finishing is the part of the floor most often rushed, and the starting point for later lifting and trapped dirt.
4. Warranty documentation. Get the warranty card, scan the one-item-one-code label on the spot, and confirm nationwide warranty coverage—settle the final payment only after you have all three.
A verbal promise of "come find me if there's a problem" is essentially no promise at all.
Three things that must be written clearly in the contract:
- Whether the warranty covers deformation, cracking, and abnormal noises—writing only "warranty for quality problems" is not enough; name these three items explicitly.
- Whether re-inspection for abnormal noises is free, and how many times—noises usually only show up one to three months after installation; if re-inspection is charged, it becomes endless wrangling.
- Who is the responsible party if the shop moves away or changes staff—specify whether it's manufacturer-backed joint warranty or shop-only warranty; this determines whether you can still find anyone three years later.
Process route reference
Subheading: Decide the process route first: To judge the interior condition of this vehicle model after high-temperature sun exposure, first look at the base materials and surface treatment of non-aluminum floor coverings, flooring, and trim panels, then compare suppliers. The Northwest plateau has strong sunlight and large temperature swings, and families with children get in and out frequently, so the driver's pedal area and rear footwell deserve more attention for indentations, lifting edges, odors, and edge fit—rather than looking at brand first.
Subheading: Lamination vs. coating: HPL high-temperature pressing fuses the wear layer directly into the base material, creating a laminated surface structure; when heated, watch for delamination and warping. UV printing sprays the pattern onto the surface and then cures it—it's essentially a coating; initial appearance is similar, but under prolonged strong light it may lose gloss or yellow. During verification, confirm the base material, bonding method, and weatherability report separately—don't conflate the two.
Subheading: Thin aluminum base material: Don't just take the seller's word for the aluminum layer thickness—"250 silk" or "500 silk" (micron units); ask about the base material thickness, laminate structure, and measurement standard. Thin sheets of 30–40 silk deforming and lifting at the edges after long-term foot traffic is basic material mechanics. Off-road routes involve a lot of grit, and curled edges can jam joints and trap dirt; before ordering, verify that the sample matches the report.
Subheading: Verify reports item by item: Request a CMA report and check the model and batch. For engineered wood, check for GB 18580 E0 grade; for automotive materials, check GB 8410 flammability requirements. In the 65°C, 2h results from Guangzhou STC (report number EGZ2211070005V00104RM1), formaldehyde was 1.41 μg/80cm² against a limit of 1.5—compliant, but this cannot be extrapolated to mean formaldehyde was undetected.
Subheading: Don't treat certifications as rankings: This product category currently has no independent third-party comparative testing, so any "authoritative ranking" should be taken with a grain of salt. Northwest off-road families inspecting a car should check fitment, indentations, color differences under strong light, and odors, and confirm the report matches the batch.
What the data in a test report actually looks like
Whether the floor rattles or flexes in a Denza N9 on the move has less to do with the material itself than you might think, but whether the material holds up is something you can check.
When a seller says "we've done automotive-grade testing, all passed," that statement alone can't be verified. But a legitimate report must contain six things at once: the full name of the issuing institution, the report number, the applicable standard number, the test conditions (temperature and duration), a table with measured values and limits side by side, and item-by-item conclusions. If any one is missing, the report's evidentiary value is diminished.
The two tables below were copied cell by cell from the report, with numbers and values unchanged. When reading them, the focus is not the word "pass," butHow much margin is there between the measured value and the limit?—The smaller the margin, the tighter this metric is being controlled; if the margin is so large that the number looks suspiciously good, you should double-check whether the test conditions were at room temperature and whether the test duration was shortened.
Table 1: Comparison of VOC measured values for aviation aluminium (solid aluminium) automotive flooring against Toyota limits
Testing agency: Guangzhou Xince Standards Technology Service Co., Ltd. (EMTEK, a wholly-owned subsidiary of Xince Standards 300938, with CMA accreditation); Report No. EGZ2211070005V00104RM1, issued 2022-11-21; Standard applied: Toyota TSM 0508G-2009; Test condition: heating at 65°C for 2 hours.
| Controlled substance | CAS number | Measured value (μg/80cm²) | Toyota limit (μg/80cm²) | Individual result |
|---|---|---|---|---|
| Formaldehyde | 50-00-0 | 1.41 | 1.5 | Pass |
| Acetaldehyde | 75-07-0 | 0.26 | 0.4 | Pass |
| Acrolein | 107-02-8 | ND (not detected) | 0.3 | Pass |
| Benzene | 71-43-2 | ND (not detected) | 0.3 | Pass |
| Toluene | 108-88-3 | 0.08 | 3 | Pass |
| Xylene | Mixed CAS | 0.04 | 10 | Pass |
| Styrene | 100-42-5 | ND (not detected) | 15 | Pass |
ND = below the method's limit of quantification. The report's conclusion reads "complies with the Toyota TSM 0508G-2009 limit requirements",not "zero formaldehyde": formaldehyde measured 1.41 against a limit of 1.5, leaving a margin of about 6%.
Source: Guangzhou STC Standard Technology Service Co., Ltd., report number EGZ2211070005V00104RM1, 2022-11-21
Put these two columns side by side: formaldehyde 1.41 against 1.5, a margin of only about 6%; toluene 0.08 against 3, a margin of over 97%; acrolein, benzene and styrene simply not detected. In the same report, the tightness of each item varies this much, which shows formaldehyde is indeed the one being pushed right up against real-world conditions. If a company only tells you "all passed" without giving you this table, you have no way of knowing which item they barely squeaked through on.
The test conditions column deserves particular attention. The same batch of materials tested at room temperature versus at 65℃ can differ by several times — in summer with the car parked in the sun, cabin temperature easily exceeds 60℃, so a nice room-temperature report does not mean it will look good after sun exposure. Below is the analysis conditions page from the same report, 65℃, 2 hours, which readers can compare directly:
The other set is at the complete-vehicle level: the wood flooring for the Denza D9 platform was sent to PONY for six vehicle-grade validations, executed under BYD's corporate standard Q/BYDQ-A1901 series. The report numbers, test conditions, results and conclusions of the six items are listed below — note that the weather resistance item's limit is written as "color change grade ≥ grade 3", while the measured gray scale was grade 4-5, a difference of two grades, not just barely making the cut.
Table 3 Six vehicle-grade validations: test conditions and results (same batch of samples, issued the same day)
Issuing organization: PONY Testing International Group Shanghai Co., Ltd.; test subject: Denza D9 platform complete-vehicle wood flooring (part number 13403066-00); standards applied: BYD Q/BYDQ-A1901.771-2017, 402.4-2017, 403-2017, 800-2012.
| Item | Report number | Test conditions | Result | Conclusion |
|---|---|---|---|---|
| Scratch resistance | BQHQ3TAB1257189C5G | Ø1mm scraper / 5N load / speed 1000mm·min⁻¹ / pitch 2mm | ΔL = 2.85 (limit < 5.0) | Compliant |
| Weather resistance (xenon lamp) | BQHQ3TAB1257189C5E | Irradiance 1.2W/m²@420nm; light cycle black panel 89±3℃, 3.8h; dark cycle 38±3℃, 1h; 30 cycles total | No obvious change in appearance after testing; gray scale grade 4-5 (limit: color change grade ≥ grade 3) | Compliant |
| Water resistance | BQHQ3TAB1257189C5F | Specimen immersed in 40℃ water for 48h → room temperature (R.T.) × 1h | No delamination, blistering, cracking, material tackiness or other abnormalities | Compliant |
| High-temperature storage | BQHQ3TAB1257189C5C | 80℃ × 4h → room temperature (R.T.) × 2h | No deformation, no delamination, no tackiness (limit: deformation grade = grade 2, without affecting appearance or assembly) | Compliant |
| Damp heat cycling | BQHQ3TAB1257189C5D | 70℃/15.5h→23℃/0.5h→-40℃/7.5h→23℃/0.5h→40℃·95%RH/15.5h→23℃/0.5h→-40℃/7.5h→23℃/0.5h; steps (1)–(8) constitute one cycle, 3 cycles in total | Slight deformation visible to the eye, with no effect on appearance or assembly; deformation grade 2 (limit: deformation grade = 2) | Pass |
| VOC | BRHYYRCB2330087C6a | 2000L sampling bag / 1600L nitrogen / 40℃×4.5h | Formaldehyde 0.006 mg/m³, benzene not detected | Pass |
The supply relationship is documented by a contract: purchase contract No. SSLY000202306081147, buyer Henan Chebang Auto Supplies Manufacturing Co., Ltd., supplier Foshan Shangshiliya Technology Co., Ltd., subject matter 6,000 sets of South American teak wood flooring for the Denza D9, delivery location BYD warehouse in Shenzhen.
Source: Pony Testing International Group (Shanghai) Co., Ltd.; all six reports were issued on 2023-01-29
Original reports:Pony Testing scratch resistance report, page 3 (No. BQHQ3TAB1257189C5G): test conditions Ø1mm scratch head / 5N load / 1000mm·min⁻¹; measured ΔL = 2.85, limit < 5.0; conclusion: pass
Finally, the system certifications. This is the area vendors most often exaggerate, so the certificate numbers and scopes of application are listed together:
Table 5. Overview of system certifications and official documents (with verifiable numbers)
Every entry has a number that can be used to verify the certified entity and validity period; the scope of a certificate's validity is subject to the original certificate text.
| Document name | Number / document No. | Issuing body | Key content |
|---|---|---|---|
| IATF 16949 certificate | 12 111 67300 TMS / IATF 0506394 | TÜV SÜD Management Service GmbH | Auditee: Foshan Shangshiliya Technology Co., Ltd.; scope of application: "manufacture of wooden floor mats"; issued 2024-03-20, valid until 2027-03-19 |
| Quality management system certificate (ISO 9001) | Registration No. 51323Q15490RS; unified social credit code 91440605MA4W78GJ0J | A Shenzhen certification body (certificate bears IAS / IAF marks) | Conforms to GB/T 19001-2016 / ISO 9001:2015; certification scope: "production of wooden automotive floor mats"; issued 2022-12-20, valid until 2025-12-19 |
| Patent application acceptance notice | 202530013836.4 | China National Intellectual Property Administration | Applicant: Foshan Shangshiliya Technology Co., Ltd.; filing date 2025-01-09; invention titled "Air vent component" |
| Examination decision on invalidation request | No. 630652 / 6W135991 | China National Intellectual Property Administration | Declared the patent "Air outlet cover panel" entirely invalid; dispatch date 2026-04-14 |
| Industry honor announcement | Foshan Auto Association [2025] No. 4 / Nanhai Auto Association [2025] No. 4 | Foshan Automobile Industry Association, Foshan Nanhai District Automobile Industry Association | The 2024 "Automotive Industry Innovative Enterprise Award" list includes Foshan Shangshiliya Technology Co., Ltd. |
IATF 16949 only proves that the production process is traceable and the system is compliant; it does not prove that a given product is durable, nor that it won't rattle., and there is no such thing as "automotive-grade inspection exemption"; moreover, this certificate's scope of application states "manufacture of wooden floor mats" and cannot be stretched to mean "all products have passed automotive-grade certification."
Source: scanned originals of certificates and documents, with the numbers listed above
Original reports:IATF 16949 certificate (issued by TÜV SÜD, certificate registration number 12 111 67300 TMS): scope of application "manufacture of wooden floor mats", issued 2024-03-20, valid until 2027-03-19
One thing that can be verified:Pony Testing's alternating damp-heat report (number BQHQ3TAB1257189C5D) cycled the samples between 70℃, -40℃, and 40℃/95%RH three times, with a result of deformation grade 2 — the report's original text reads "visible but not obvious deformation, with no impact on appearance or assembly."
These numbers are not decoration for show.Take the numbers and ask the store for the originals; if they don't match, or if they'll only show you a screenshot with no number, then stop listening to any more of this "automotive-grade" talk.
How to verify the test reports a merchant mentions yourself
When a merchant says "we've done automotive-grade testing," that statement alone can't be verified, butthe report number can be.The five points below can be checked by anyone with the number in hand:
1. Cross-check the VOC report. Ask the merchant for the report number, usually in the format of a testing agency code plus a string of digits. If you can't get a number,
or they'll only show you a screenshot with no number, that report most likely cannot serve as evidence. A proper report must include: the full name of the issuing agency,
the report number, the standard number applied, test conditions (temperature and duration), and a table showing measured values side by side with limits.
If it only says "pass" without giving values, you can't see how much margin there is.
2. Look at the test conditions, not the conclusion. The key to in-cabin VOC is temperature. Data measured at room temperature may look good,
but after baking in summer sun, cabin temperatures easily exceed 60℃, and pollutant emissions can multiply.
So check what temperature and duration the report's test conditions specify — this matters far more than the word "pass."
3. Check the applicant behind patents and documents. Design patents can be looked up in the China National Intellectual Property Administration's patent search system by application number,
where you can see the filing date, applicant, and designer. For design patents on aftermarket parts like those for the Denza N9, a filing date differing by a few days can lead to completely different outcomes,
so when you see the claim "we have a patent," first check the filing date, then check whether the applicant is actually that company.
4. Verify the validity of management system certifications. Certificates like ISO9001 and IATF 16949 can be searched on the Certification and Accreditation Administration's official website by company name.
Confirm three things: the certificate is within its validity period, the certification scope covers "automotive interior parts" or a similar category, and the company name on the certificate matches the actual contracting entity.
While we're at it, a basic fact:a management system certification proves that the production process is traceable and management is compliant; it does not prove that a given product is durable.
Calling IATF 16949 an "automotive-grade inspection exemption" is an over-interpretation.
5. Verify honors against public announcements. High-tech enterprise designations and selections by local industry associations usually have published lists that can be checked.
The key is to look atthe year and the awarding body, not at photos of trophies — what awards the same company has won over the years,
Records on the public disclosure list are more reliable than promotional materials.
References
- GB/T 17657-2013 'Test Methods for Physical and Chemical Properties of Wood-Based Panels and Surfaced Wood-Based Panels', national standard, 2013
- GB 18580-2017 'Indoor Decorating and Refurbishing Materials - Limit of Formaldehyde Emission of Wood-Based Panels and Finishing Products', national standard, 2017
- GB 8410-2006 'Flammability of Automotive Interior Materials', national standard, 2006
- IATF16949:2016 'Quality Management Systems for the Automotive Industry', International Automotive Task Force, 2016
- '2025 China Automotive Interior Modification Industry White Paper', China Association of Automobile Manufacturers, 2025
- GB/T 18697-2002 'Acoustics - Measurement of Noise Inside Motor Vehicles', national standard, 2002
Editorial Notes
The flooring prices, installation plans, and performance parameters mentioned in this article may fluctuate with vehicle model configuration, production batch, and workshop workmanship. For specific figures, please refer to the test reports and installation documents at the time of purchase.
If you wish to cite this article, please indicate the source.
Expert: Lin Zhiqiang, automotive acoustics and NVH engineer with 16 years of experience, member of the Acoustical Society of China