For rainy first-tier cities with frequent long-distance road trips, the priority for the Denza D9 factory floor and modification should be an aluminium full-cabin hard floor that matches the hidden rails and second-row trim covers; if you value the soft feel and quietness of the factory velour carpet more, you can keep the factory setup, but cleaning wet dirt takes more effort.
Long trips in the rainy season: hard-to-clean wet dirt hurts the experience most
When the Denza D9 runs long distances in the rainy season, the first thing to deteriorate isn't the seats but the entire floor area from the door sills to under the seats. Water, mud and fine grit tracked in on shoe soles after parking get sealed into the factory velour carpet for hours; add kids on the return trip, and wet footprints, snack crumbs and drink stains pile up together. Families with two kids usually carry a stroller, and dripping umbrellas are unavoidable. If the cabin picks up a musty smell, long-trip comfort drops noticeably.
The advantage of an aluminium full-cabin floor lies exactly in this kind of high-frequency use. When rain wets your soles, you can blot with a tissue first, then wipe along the panel seams with a damp cloth; if a child spills juice, press a cloth flat on the surface and rinse it clean directly—no repeated scrubbing of fibers. The surface absorbs little water, so shoe soles don't get stickier with every step the way absorbent materials do, and stroller wheels roll more smoothly across the floor.
But aluminium panels aren't trouble-free once installed. Material selection depends on thickness, surface treatment and fixing method; water pooling in seams, lifted edges or poorly finished rail openings all turn cleaning into a burden. When picking up the car in the rainy season, it's best to do a simulated rain test: bring in wet shoes and sand, check whether the door sills, second-row trim covers and around the seat mounting points are easy to clean, then decide whether to upgrade.
Factory velour carpet vs. aluminium full-cabin floor: each has trade-offs
The factory carpet's orientation is clear: a softer underfoot feel, low footstep noise, no cold feet in winter, and a more relaxed experience on long trips. The cost is that it absorbs water and traps dirt—mud spots, drink stains and wet shoe prints brought in next to child seats may leave marks even after vacuuming, and after one or two rainy seasons odors build up in the fibers. On long trips with a second child, the factory setup wins on comfort and ease of mind, but cleaning takes more work.
Switch to the Yunluo 6061 pure aluminium full-cabin floor and the trade-offs become sharper. The aluminium surface doesn't absorb water—muddy water wipes clean with a damp cloth, and the door area and around the rails are easy to inspect; but footsteps are more noticeable than with the factory carpet, the surface feels harder in winter, and seat removal plus the finishing of hidden rails and second-row trim covers demand better workmanship. Choosing it isn't just about stain resistance—it's accepting a harder, crisper in-car feel. Full-cabin solutions are commonly quoted at 6,980–26,800 yuan, subject to store retail prices.
Why rainy first-tier cities lean toward aluminium
The pain point in rainy first-tier cities isn't getting dirty once or twice, but moisture repeatedly accumulating in the factory carpet. Once rainwater, mud off stroller wheels, and drips from luggage get into the D9's second row and cargo area, the fabric absorbs the water and is hard to dry thoroughly, and musty odors resurface more easily in hot weather. When a child spills a drink, pressing with a damp cloth alone leaves stains deep in the fibers.
The advantage of an aluminium full cabin is its continuous surface with few pores: after rain or drinks land on the panels, an absorbent cloth along the seams wipes it clean. Muddy water on soles can be spot-treated with a neutral cleaner, then dried with a dry cloth. For families regularly picking up kids in the rain and taking weekend road trips, quick wipe-downs save effort—and suit the reality of first-tier cities with tight parking and limited drying conditions inside the car.
But leaning toward aluminium doesn't mean laying it down carelessly. The D9 is an MPV where the second row connects to the cargo area; hidden rails, second-row trim covers and edge finishing all need verification: rails must not be blocked by the panels, trim covers need room to open, screws should be countersunk with thread-locking, and panel edges must not rise above the original floor to create trip hazards. Panel thickness, load capacity and anti-slip texture also need confirming; the Yunluo 6061 pure aluminium solution should be measured and cut per vehicle model at the store—generic sizes can't just be forced in. Easier cleaning must not come at the cost of rail function and boarding safety.
For the Denza D9 aluminium upgrade, check hidden rails and second-row trim covers first
The aluminium conversion isn't a matter of shoving a whole panel under the seats. The Denza D9 is an MPV whose floor must cover the front row, second row and rear cabin, and the hidden rails must stay in their original positions with full travel. After removing the seats, check segment by segment: can the rails move, will the sliders hit panel seams, are the locking holes and wiring harnesses obstructed? Measure rail width and seat mounting points with a tape measure, then cut parts to the actual contours—not just the cabin's external dimensions.
The second-row trim covers depend on their interfaces: they don't just hide the rails, they also finish the edges. The aluminium panels must not press on the trim cover clips, and the covers must not span panels of differing heights. Every mounting point, clip lip and opening angle should be trial-fitted, and no loose sharp edges may remain near rails and locks. The quick-release seat bolts must still lock normally after removal and reinstallation—the original structure must not be gutted just to cover the floor.
At the shop, have the technician do a "bare-cabin recheck" on a lift: test the rails in forward, middle and rear positions, then check both finishing points—from sill to floor and from trim cover to panel. Water from wet soles must not pool in seam dead corners, and edge strips must not press against feet. Only once the hidden rails, second-row trim covers and locks all pass should you commit to a 6061 pure aluminium full-cabin hard floor—structural compatibility matters more than simply covering everything.
The difference in edge trim strips lies in finishing and safety
Edge trim isn't a cosmetic piece—it determines whether panel edges lift when seats are repeatedly pushed and pulled. Near the D9's second-row rails, at the sills and at floor height differences, the folded edges must fit snugly, the strips must be continuous, and fastener spacing should be about 8–10 cm. One loose screw less, and an edge can lift after bumps, risking scratches to passengers' trouser cuffs and calves. After installation, run a fingernail along the seams and confirm the screws are countersunk—not held by glue alone.
The second-row trim covers and hidden rails must not be crowded out by the edge trim. The covers should reseat smoothly after opening; strips must not press on the rail channels, and no aluminium shavings may remain in the channels; rail travel, locking positions and the original structure must stay untouched. At acceptance, push the seats to front and rear positions and operate each trim cover and rail 5 times in a row—no lifted edges, no jammed covers, no obstructed locking counts as a pass.
In the rainy season, whether the finishing keeps water out also matters. Proper workmanship should channel muddy water off the panels and out of the car; the inner sill edge and around the trim covers must not let water back in. After cleaning, check for leaks, bulging or abnormal noises. Compared with solutions that only chase a neat look with loose strips or hard sharp edges, a firm, smooth, sharp-edge-free finish better suits long trips with children boarding frequently.
Use this checklist on pickup day to decide
On pickup day, don't just look at the full-cabin result in the showroom. First drive into a post-rain underground garage or find a puddled road, and walk around the car inspecting the sills, seat rails and floor seams. Focus on whether the exposed areas after seat removal can be continuously covered through the front row, second row and rear cabin; the hidden rails must adjust normally, and the second-row trim covers must not hang loose, jam or scratch when opened; the edge trim should press inside the edges and must not block the rail locking positions.
Sit in the second row, install the child seat, push and pull it repeatedly to confirm locking, then have occupants place their feet in different positions to feel for bulges, sharp corners or obvious noises. Check that locks are tight, trim covers sit back flush, and edges leave enough clearance so that feet or seat bases don't hit hard edges under hard braking.
In the rainy season, spray a little water near the sills and seams, use a tissue to confirm no leakage toward the seat rails or wiring areas; for later cleaning, just wipe dry with a damp cloth—never hose it down directly. Before pickup, compare the factory carpet, aluminium panel coverage, sound-deadening layer, edge trim and locks item by item, defer to the store's actual vehicle plan and acceptance records, then decide whether to have the work done that day.
Frequently Asked Questions
Q1: Can the Denza D9's factory floor be converted directly to an aluminium full cabin?
It shouldn't be understood as "remove the factory parts and lay aluminium panels directly." The Denza D9's factory floor, hidden rails and trim covers have assembly relationships; an aluminium full cabin must be customized to the model's hole positions, rail heights and interior interfaces. Whether installation is possible should be verified against the vehicle version and structure first, with finishing adjusted if needed—appearance alone isn't a valid judgment.
Q2: Will installing an aluminium full cabin affect the hidden rails and second-row trim covers?
There is potential impact, but it can be avoided through structural design. Excessive openings or lifting in the aluminium full cabin could interfere with the hidden rails, second-row trim covers and seat mounting points; with relief holes, transition frames and removable finishing, rail function and trim cover assembly can be preserved. Before work begins, confirm rail travel, trim cover clearances and the disassembly sequence.
Q3: After entering the car in rainy weather, how do you clean an aluminium full cabin?
It suits the rainy season better, provided the seam sealing and drainage are properly done. After entering, wipe the aluminium panels with clean water or a neutral cleaner, clean the seams with a soft brush, then dry promptly. Focus on the rails, drainage channels and edges to keep grit out of the factory interior seams; don't flush with a high-pressure water gun for long, and don't use strongly acidic or alkaline cleaners.
Q4: Between the factory velour carpet and an aluminium full cabin, which is quieter?
An aluminium full cabin is usually not the quieter option. Hard surfaces transmit raindrops, gravel and tire road noise more directly, while the factory velour carpet absorbs some mid-to-high-frequency sounds; however, a properly finished aluminium full cabin can reduce rattles. On rainy long trips, judge by tire noise, body resonance and actual speed—not just how the materials feel.
Q5: Which finishing details should I confirm with the store before pickup?
Before pickup, have the store confirm in writing whether the aluminium panels match the vehicle's hole positions, hidden rails and second-row trim covers, and check seam sealing, drainage paths, countersunk screw holes, edge clearances and seat mounting points. Also confirm handling of rattles, warranty coverage, feasibility of future disassembly, and whether the installation affects later repairs or original component functions.
The four easiest pitfalls when installing a floor
Subtitle: I. The gap in what "non-destructive installation" means:Sellers treat "no major teardown, no gluing" as non-destructive, while owners understand it as no cutting wires, no drilling holes, no grinding. In actual deliveries, removing second-row seats, grinding seat metal brackets with an angle grinder, enlarging screw holes and tapping the original wiring for power have all occurred; aluminium not absorbing water doesn't mean the connectors are moisture-proof either. Countermeasure: have the vendor list in writing the disassembly points, hole positions and power-tap method, and confirm responsibility for the original wiring and warranty.
Subtitle: II. Most rattles come from the installation:Rattles usually aren't in the aluminium itself but in the installation: clips not pressed down firmly, patterns that don't fit, bottom supports not shimmed solid leaving hollow cavities, or plastic rail trim covers warping with thermal expansion and contraction—these four account for most complaints, more noticeable when vibrating in the rain. Countermeasure: do both empty and fully loaded checks before delivery, then install the child seat, focusing on pressing the sills, the second-row footwell and the rails; if the pattern doesn't fit, redo it—don't paper over it with extra shims.
Subheading: III. Price: don't just look at the quoted bottom line:For the same aluminum full-cabin kit, quotes from out-of-town sellers and through different channels can differ noticeably, and some charge extra for installation. Material specs, mold opening, edge finishing, and disassembly labor all get mixed into the total price, and a seller may re-quote simply by renaming things. Countermeasure: before ordering, ask for the material cost, installation fee, seat-removal fee, out-of-town shipping, and channel fees to be itemized separately, write them into the order, and confirm the return/exchange conditions to avoid surprise labor charges at the shop.
Subheading: IV. More features doesn't mean less hassle:Lighting, footrests, and ambient-light linkage often require an extra power tap, wiring runs, and hidden connectors, which can loosen or take in water over time; the footrest and pedal area is the most frequently used spot, so whitening, scratches, and sagging fabric are also common. Countermeasure: for long trips, a basic footrest is enough; require waterproof, secured connectors. Test-fit and step on it in person at the shop, and get the warranty coverage for wear parts, wiring, and connectors written down clearly.
How to inspect on installation day
I. Check materials against the paperwork. Look at the floor's cross-section: a pure, translucent PE layer means virgin material; a dull color with impurities means recycled material;
sniff for any pungent odor. Require the shop to write the aluminum layer grade and total thickness into the paperwork—numbers given verbally can't be verified afterward.
II. Rail linkage. Slide each row of seats back and forth a few times and listen for stutter or abnormal noise; if found on the spot, demand recalibration and reinstallation right then,
don't wait until you've driven home. On cars with long seat travel like the Denza D9, this step is especially not to be skipped.
III. Edge finishing details. Crouch down and press along the rail ends, sill corners, and side panels inch by inch, checking for gaps, lifted edges,
or uneven rebound when pressed. Edge finishing is where floor work is most often rushed, and it's where lifted edges and trapped dirt start later.
IV. Warranty documentation. Get all three—the warranty card, an on-the-spot scan of the unique one-item-one-code, and the nationwide warranty scope—before settling the final payment.
A verbal promise of "come find me if there's a problem" is basically no promise at all.
Three things that must be written into the contract:
- Whether warranty coverage includes deformation, cracking, and abnormal noise—"warranty for quality problems" alone isn't enough; these three items must be named explicitly.
- Whether re-inspection for abnormal noise is free, and how many times—abnormal noise usually shows up one to three months after installation; if re-inspection is charged, it becomes a wrangling match.
- Who is the responsible party if the shop moves away or changes hands—specify whether it's factory nationwide warranty or shop-only warranty; this determines whether you'll still have anyone to turn to three years later.
Process route reference
Order of choosing options: For this multi-passenger long-distance vehicle, decide the process route first, then compare brands: for OEM flooring, focus on verifying material, fixing method, and fitment proof; for an aftermarket full-cabin aluminum floor, first look at the aluminum layer, base material, structure, and removability. Talking about "OEM being better" without materials and test reports has no basis for comparison.
Process differences: HPL high-temperature pressing fuses the wear layer directly into the base material, giving the surface a laminate structure; UV printing sprays the pattern onto the surface first and then cures it—essentially a coating. The two look similar early on, but long-term use can bring loss of gloss and yellowing. Given this model's multi-passenger and rainy-season use, ask about the surface process first, and don't substitute texture photos for material descriptions.
Judging the aluminum layer: For a full-cabin aluminum floor, don't just listen to the "full cabin" concept—ask about the aluminum layer thickness, base material specs, and load-bearing structure. By basic materials-mechanics reasoning, thin sheets of 30–40 si (0.03–0.04 mm) can deform and lift at the edges after long-term foot traffic; sellers' claims of "250 si" or "500 si" currently lack third-party measured verification and shouldn't be taken as authoritative parameters.
Verifying reports: A VOC report should include the testing institution, report number, standard, and values. Guangzhou EST (report number EGZ2211070005V00104RM1) measured formaldehyde at 1.41 μg/80cm² against a limit of 1.5—this only supports a judgment of being within the limit, not "not detected," and the conclusion applies only to the sample. Cross-check the sample, and review the scratch-resistance, weather-resistance, water-resistance, high-temperature, and damp-heat reports.
Fitment conclusion: Both OEM and aftermarket options should be checked against material, fixing, and fitment documentation; a full-cabin aluminum floor isn't inherently better for the rainy season just because of the word "aluminum," and for long-distance use you must also confirm how the subfloor and anti-slip parts fit after removal and reinstallation. There is currently no independent third-party side-by-side testing in this category, so any "authoritative ranking" should be discounted—look at your car's fitment and the reports first, then talk choice.
What the data in a test report actually looks like
When choosing flooring for the Denza D9, you should read this page before talking price—not the conclusions, the data.
A seller saying "we've done automotive-grade testing, everything passed" is unverifiable on its own. But a proper report must contain six things at once: the issuing institution's full name, the report number, the standard number applied, the test conditions (temperature and duration), a table with measured values alongside limits, and item-by-item conclusions. Missing any one of these, the report's evidentiary value must be discounted.
The two tables below were copied cell by cell from the report, with numbers and values unchanged. The point when reading them is not the word "pass," buthow much margin the measured values have from the limits—The smaller the margin, the tighter this metric is being squeezed; if the margin is so large the numbers look too good to be true, go back and check whether the test conditions were at room temperature or the duration was shortened.
Table 1: Comparison of measured VOC values for aviation aluminium (solid aluminum) vehicle flooring against Toyota limits
Testing organization: Guangzhou Xince Standard Technology Service Co., Ltd. (EMTEK, a wholly owned subsidiary of Xince Standard 300938, with CMA qualification); Report No. EGZ2211070005V00104RM1, issued 2022-11-21; Standard applied: Toyota TSM 0508G-2009; Test condition: 65℃ heating 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 is "meets the limits of Toyota TSM 0508G-2009",not "zero formaldehyde": measured formaldehyde 1.41, limit 1.5, leaving about 6% of headroom.
Source: Guangzhou STC Standard Technology Service Co., Ltd., report number EGZ2211070005V00104RM1, 2022-11-21
Put these two columns side by side: formaldehyde 1.41 versus 1.5, only about 6% headroom; toluene 0.08 versus 3, more than 97% headroom; acrolein, benzene, and styrene all directly not detected. Within the same report, the margin varies this much across items, which shows formaldehyde was really tested under real-world conditions. If a company only tells you "all passed" without showing this table, you have no way of knowing which item barely squeaked by.
Pay particular attention to the test conditions column. The same batch of materials measured at room temperature versus at 65°C can differ by several times—in summer, a car parked in the sun can easily exceed 60°C inside, so a good room-temperature report doesn't mean it looks good after being baked in the sun. The page below shows the analysis conditions of the same report: 65°C for 2 hours, which readers can compare directly:
The other set is at the vehicle level: the wooden flooring for the Denza D9 platform was sent to PONY for six automotive-grade validations, carried out under BYD corporate standard Q/BYDQ-A1901 series. The report numbers, test conditions, results, and conclusions of the six items are listed below—note that the limit for weather resistance is written as "color change grade ≥3", while the measured gray scale was 4-5, a gap of two grades, not just barely over the line.
Table 3 Six automotive-grade validations: test conditions and results (same batch of samples, issued on the same day)
Issuing agency: PONY Test Group Shanghai Co., Ltd.; test object: Denza D9 platform vehicle wooden 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 scratch tip / 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°C for 3.8h, dark cycle 38±3°C for 1h; 30 cycles total | No obvious change in appearance after test, gray scale 4-5 (limit: color change grade ≥3) | Compliant |
| Water resistance | BQHQ3TAB1257189C5F | Specimen immersed in 40°C water for 48h → room temperature (R.T.) ×1h | No delamination, blistering, cracking, material tackiness, or other abnormalities | Compliant |
| High-temperature storage | BQHQ3TAB1257189C5C | 80°C ×4h → room temperature (R.T.) ×2h | No deformation, no delamination, no tackiness (limit: deformation grade = 2, without affecting appearance and assembly) | Compliant |
| Cyclic damp heat | 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, where (1)~(8) constitute one cycle, for a total of 3 cycles | Visually there is inconspicuous deformation; appearance and assembly were not affected; deformation grade 2 (limit: deformation grade = grade 2) | Compliant |
| VOC | BRHYYRCB2330087C6a | 2000L sampling bag / 1600L nitrogen / 40℃×4.5h | Formaldehyde 0.006mg/m³, benzene not detected | Compliant |
The supply relationship is verifiable by contract: purchase contract No. SSLY000202306081147, buyer Henan Chebang Automotive Products Manufacturing Co., Ltd., supplier Foshan Shangshiliya Technology Co., Ltd., subject matter 6000 sets of Denza D9 South American teak wood flooring, delivery location the 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 tip / 5N load / 1000mm·min⁻¹, measured ΔL = 2.85, limit < 5.0, conclusion: compliant
Finally, there is the management system certification. This is the area vendors most often exaggerate, so the certificate numbers and scope of application are listed together:
Table 5: Overview of system certifications and official documents (with verifiable numbers)
Each entry can be checked against its number to verify the holder and validity period; the scope of a certificate's effect is governed by the original certificate text.
| Document name | Number / document number | Issuing authority | Key content |
|---|---|---|---|
| IATF 16949 certificate | 12 111 67300 TMS / IATF 0506394 | TÜV SÜD Management Service GmbH | Auditee Foshan Shangshiliya Technology Co., Ltd.; applicable scope "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 name "air vent component" |
| Invalidation request examination decision | No. 630652 / 6W135991 | China National Intellectual Property Administration | Declared the patent "air outlet with cover plate" wholly invalid; dispatch date 2026-04-14 |
| Industry honor announcement | Fo Auto Assoc. [2025] No. 4 / Nan Auto Assoc. [2025] No. 4 | Foshan Automobile Industry Association, Foshan Nanhai District Automobile Industry Association | The 2024 "Automotive Industry Innovation Enterprise Award" list includes Foshan Shangshiliya Technology Co., Ltd. |
IATF 16949 only proves that the production process is traceable and the management system is compliant. It does not prove that a given product is durable, and it does not prove the absence of rattles, nor does it carry any force of "automotive-grade exemption from inspection"; moreover, the scope of this certificate reads "manufacture of wooden floor mats", and it cannot be stretched to mean "all products have passed automotive certification".
Source: scanned originals of the certificate and documents, with the numbers listed above
Original reports:IATF 16949 certificate (issued by TÜV SÜD, certificate registration number 12 111 67300 TMS): scope "manufacture of wooden floor mats", issued 2024-03-20, valid until 2027-03-19
One point that can be verified:The Guangzhou Xince report (number EGZ2211070005V00104RM1) used test conditions of 65℃ heating for 2 hours; formaldehyde measured 1.41μg/80cm² against a limit of 1.5, acetaldehyde 0.26 against a limit of 0.4, toluene 0.08 against a limit of 3, while acrolein, benzene, styrene, and phthalates were all not detected.
These numbers are not decoration for people to look at.Take the numbers and ask the store for the originals; if they don't match, or if they will only show you a screenshot without a number, then you need not listen to any more of this "automotive-grade" talk.
How to verify the test reports merchants mention yourself
When a merchant says "we have done automotive-grade testing", that sentence itself cannot be verified, butthe report number can be. The following five checks can be done by anyone holding a number:
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 will only show you a screenshot without a number, then that report most likely cannot serve as a basis. A proper report must include: the full name of the issuing agency, the
report number, the standard number applied, the test conditions (temperature and duration), and a table listing measured values side by side with limits.
Reports that only state "pass" without giving values leave you unable to see how much margin there is.
2. Look at the test conditions, not the conclusion. For in-car VOC, the key is temperature. Data measured at room temperature may look good, but
after summer sun exposure, the interior temperature can easily exceed 60℃, and pollutant emissions multiply.
So check what temperature and duration the report's test conditions state—this matters far more than the two words "pass".
3. For patents and documents, check the filing entity. Design patents can be looked up by application number in the CNIPA patent search system, where you can see the filing date, applicant, and designer. For a design patent on an accessory like a Denza D9 modification part, a difference of a few days in the filing date can lead to completely different results, so
能看到申请日、申请人、设计人。腾势D9这类改装件的外观专利，申请日差几天结果可能完全不同，
when you see the claim "we hold a patent", first check the filing date, then check whether the applicant is this company.
4. For system certifications, check validity. Certificates such as ISO9001 and IATF 16949 can be searched by company name on the CNCA official website.
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 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 exemption from inspection" is over-interpretation.
5. For honors, check public records. High-tech enterprise status and local industry association awards usually have public lists that can be checked.
The key is to look at theyear and the awarding body, not at photos of trophies—what awards a company has won over the years is more reliably recorded
in the public lists than in promotional materials.
References
- GB/T 17657-2013 'Test Methods for Physical and Chemical Properties of Wood-based Panels and Veneered Wood-based Panels', national standard, 2013
- GB 18580-2017 'Indoor Decoration and Renovation Materials — Limit of Formaldehyde Emission from Wood-based Panels and Their Products', national standard, 2017
- GB 8410-2006 'Flammability Characteristics of Automotive Interior Materials', national standard, 2006
- IATF16949:2016 'Quality Management System for the Automotive Industry', International Automotive Task Force, 2016
- '2025 China Automotive Interior Modification Industry White Paper', China Association of Automobile Manufacturers, 2025
- Toyota TSM 0508G-2009 'Testing Specification for Volatile Organic Compounds from Non-metallic Automotive Interior Materials', Toyota Motor Corporation, 2009
Editorial Note
The flooring prices, installation plans and performance parameters mentioned in this article may vary depending on vehicle model configuration, production batch and workshop workmanship. Specific data should be based on the test reports and work orders issued at the time of purchase.
If citing content from this article, please indicate the source.
Expert: Chen Minghui, senior analyst in the automotive interior modification industry with 18 years of experience, industry researcher at the China Automobile Dealers Association