For the Lynk & Co 900, interior odor in humid South China plus off-road scenarios is mainly caused by the factory suede carpet molding after absorbing moisture, water lingering in the door sill and seat rail gaps after wading, and air conditioning condensate backflow. Humidity near the battery compartment vent on plug-in hybrids is also easy to overlook. Check whether the floor covering layer is holding water before talking about odor removal.
Why does the odor always rise from underfoot after off-roading in the South China rainy season
Run an off-road trip during the South China rainy season, and nine times out of ten that smell in the cabin on your return is rising from under your feet. The Lynk & Co 900 comes from the factory with a suede carpet that looks thick and plush, but the problem lies exactly in that suede layer. Muddy water and dew seep in through your shoe soles and pant cuffs; the surface gets wiped dry, but the layer underneath is still holding water. In South China's humidity, after two days of being trapped in there, the smell becomes impossible to suppress.
Last week a car came in where the owner said he'd driven some mountain roads near Huizhou, then parked it in the garage for three days—opening the door hit you with a sour, rancid smell. Lift a corner of the carpet and press with a finger, and water marks seep out; the sound-deadening layer underneath had gone soft and black. Cases like this can't be fixed by opening the windows for air—the water is sealed between the suede and the sound-deadening cotton, and the more you sun it, the more it stews.
So the first thing after coming back from off-roading isn't washing the car—lift the four corners of the carpet to check for dampness, especially at the driver's seat and rear footwells. The factory carpet is one pressed, bonded piece, and once water gets in, it's very hard to dry on its own. A real fix means removing the seats and covering the entire floor with aluminum panels—6061 pure aluminum or 5052 aviation aluminium floor both work—with a Mohs hardness of 8; the surface doesn't absorb water and dries with one wipe. Installation costs 6,980-26,800, subject to the store's retail price.
Check these 4 floor seams on pickup day
On pickup day, with good light, drive the car outdoors and crouch down—checking floor seams is more useful than checking the paint. First spot: the junction between the inner sill trim strip and the factory carpet. Run a finger along it—on the factory setup there's usually a plastic strip clipped directly onto the carpet edge, and the gap collects debris, becoming a breeding ground for mold in humid weather. Second spot: the end caps of the seat rails. On an SUV the rails are exposed; if a cap is loose, mud and water burrow straight under the carpet. Lift the cap and check for water marks inside.
Third spot: the seam between the trunk sill plate and the side panel—camping gear loading and unloading most easily scuffs water marks here, and unevenly sealed seams show dampness first. Fourth spot: lie down and look for exposed sound-deadening between the carpet and the body sheet metal. Once that layer of sound-absorbing cotton under the factory carpet takes on water, it won't dry out even after three days in the sun—that's where the odor rises from.
After checking these four spots, you'll know: which seams are loose from the factory finish and which can be cleaned up in one go later with full-cabin aluminum flooring. If you really plan to install aluminum panels, note down these positions on pickup day so you can check against them when the seats come out for installation—whether the edge trim strips can cover the factory seams depends entirely on this step.
What happens after the factory suede carpet absorbs moisture
In South China's rainy-season off-road scenarios, the problem with the factory carpet isn't dirt—it's that it traps water inside the car. Once the foam layer and suede fibers are saturated, the surface feels dry within half an hour, but the underneath takes two or three days to release it all. During that time, cabin humidity stays at 70-80%, and that's where the odor starts rising from.
I've seen a car that had run muddy roads—lift the carpet edge and the sound-deadening cotton underneath seeps water marks when pressed, and squeezing it with fingers pushes moisture out. Left like that for three days, the back of the suede starts turning sticky, smelling like a wrung-out wet towel. Worse still are those few millimeters between the carpet and the sill trim strip: sediment squeezes in with the water, dries into hard lumps, and repeated friction can even loosen the factory strip's clips.
Cars fitted with full-cabin aluminum flooring don't have this stage, because the floor is a single sheet of 6061 pure aluminum laid across—water only sits on the panel surface and is gone with one wipe. The fabric-grain pressed surface itself doesn't absorb water, and once the edge trim seals the border, there's no path for water and sediment to get in. If the sound-deadening layer is enclosed under the aluminum panel, it never touches the seeping moisture either.
So after off-roading, don't just stare at whether the surface is dry. Lift a carpet corner and press down—feeling whether there's dampness underneath is far more accurate than looking at the surface.
Edge trim strips differ at the finishing
After off-roading, lift a corner of the carpet—the problem most easily spotted is often not the panel surface but that finishing edge. Full-cabin aluminum flooring must break around seat mounts, door sills, and the trunk threshold; how those cut ends are treated directly determines where moisture goes in humid weather. If the edge trim is done crudely, with raw aluminum alloy cut edges exposed, the burrs catch your hand, and worse, the mud water trapped in the gaps dries slowly—the musty smell seeps out along that line.
Take an SUV like the Lynk & Co 900: the trunk threshold and the area near the rear seat anchor points have big height changes, so the trim strip must be bent to follow the sheet metal's contour, and at corners it should press down flush with no lifted edges. I've seen shortcut jobs where the strip was screwed straight into the trim panel with self-tapping screws, no sealing around the screw holes—water splashed up during off-roading runs down the screw holes, and it's only discovered once the sound-deadening layer underneath is soaked. A proper finish means the strip presses the panel edge, screws are countersunk, and seams are sealed with adhesive; run your hand over it and it should be one continuous hard edge with no gap that can take a fingernail.
Another detail is the overlap between the trim strip and the factory carpet. At the junction, the strip should cover the carpet edge by at least a centimeter, letting water flow off the strip's surface rather than seeping into the carpet pile. During South China's humid 'return of the south wind' days, this overlap line is the first spot to turn damp. With a clean finish, one cloth wiped along the strip cleans it in a single pass; with a rough finish, the rag snags threads and the wiping gets more frustrating the more you do it. After installation, shine a flashlight at an angle along the floor on the spot—any light-leaking gap under the trim strip is immediately obvious.
How the plug-in hybrid battery compartment vent relates to floor moisture
The Lynk & Co 900 is a plug-in hybrid, and the battery compartment vent is located under the floor—separated from the cabin floor by only one layer of sheet metal and sound deadening. After off-roading in South China, mud water on shoe soles seeps into the factory carpet, moisture travels downward, and the first thing it touches is the ventilation path around the battery compartment. If moisture accumulates there long-term, the odor isn't just carpet mold—it also drifts back into the cabin through the vent.
One installation detail is worth noting here: when removing seats to lay full-cabin aluminum flooring, the floor follows the actual car floor, so at the vent location you must either leave an access cutout or use a decorative cover with an openable design—you can't just lay over it and seal it shut. Our full-cabin installation uses 6061 pure aluminum panels, cut at the edges to the original floor contours, with a pressed border finish left around the vent so it covers debris without blocking airflow. If the car already has a trim cover there, after flooring installation the seam must be re-pressed and re-sealed with trim strips.
What moisture fears most is being trapped underneath with no way out. Aluminum flooring itself doesn't absorb water—if the floor gets wet, just wipe it dry with a cloth, unlike the factory setup that locks water in the suede and lets it keep seeping out. But check around the battery compartment vent periodically, especially within a week after off-roading: press the back of your hand against the floor's finished edge—if it feels cool and damp, the underneath isn't dry yet, and the car should be parked somewhere ventilated to air out for another half day.
Drying and inspection order for the floor after the humid season
If off-roading is followed by South China's continuous drizzly rain, the worst thing is tossing the car in the garage and forgetting about it. Full-cabin aluminum flooring has the advantage of a non-absorbent surface, but water vapor still travels down through the edge trim gaps and sits stewing between the sound-deadening layer and the factory carpet. My habit is to wipe the mud water off the aluminum panel surface with a dry cloth the same day you return—don't wait for it to air-dry. 6061 pure aluminum doesn't fear water; what it fears is mud drying into lumps on the fabric-grain surface, making it look worse with every wipe.
After wiping, don't rush to close the doors—open all four doors and the tailgate fully and let a cross-draft pass through. Focus on two spots: one, the finished edge at the rear seat removal openings—run a finger along the trim strip, and any dampness means water has already seeped under the latch; two, the floor near the plug-in battery compartment vent—that area runs warmer and moisture gathers faster, so press a tissue against it and see if it leaves a damp mark.
For order, I suggest wipe first, then inspect, then ventilate: dry the surface, feel the seams, and finally leave the doors open to air. If the area under the trim strip feels clearly wet to the touch, don't rely on airing alone—go back to the shop and have a technician lift that short section of edge trim to check the sound-deadening layer. The aluminum panel itself doesn't fear moisture; what really needs watching is the sealing condition of those few centimeters of finishing edge, which relates directly to how firmly the strips were pressed during installation. A sloppy job, and after the rainy season the smell is exactly where it comes from.
Frequently asked questions
Q1: After the Lynk & Co 900 wades through water off-road, does the cabin floor need to be opened up to air dry?
No disassembly needed. Under the Lynk & Co 900's factory carpet there's a layer of sound-deadening cotton; after wading, water mainly sits between the surface layer and the sound-deadening layer. The right approach is to lift the non-aluminum trim pieces, remove the detachable carpet sections, press them dry with absorbent towels, then run the air conditioning's heating on fresh-air mode for over 2 hours. Only if the water has risen above the sill strips and the sound-deadening cotton is saturated do you need the shop to remove the seats—otherwise, sealed up, it will surely mold.
Q2: In South China's humid 'return of the south wind' season, why does the Lynk & Co 900's cabin floor turn damp with a moldy smell?
The root of the dampness is condensation on the floor caused by the temperature difference between inside and outside the car, combined with the factory carpet fibers absorbing moisture without releasing it. During this season, run the air conditioning's dehumidify mode for 20 minutes daily and park in a ventilated, dry spot. If a musty smell has already appeared, water has seeped into the sound-deadening layer and it needs to be opened up to dry. Full-cabin aluminum flooring, with its non-absorbent surface, can reduce condensation retention, but air conditioning dehumidification still can't be skipped.
Q3: Does the musty smell near the plug-in hybrid's battery compartment need separate treatment?
Yes, check it separately. The Lynk & Co 900's battery compartment sits in the middle of the chassis; after off-road wading, moisture can seep through sealing gaps into the area around the compartment. If a sour or musty smell concentrates at the rear footwells, first check whether water has entered the battery compartment vent. Don't remove the battery cover yourself—have the shop blow out the drainage channels around the compartment with dry compressed air and confirm the sealing strips are intact. Delay accelerates oxidation of wiring harness connectors.
Q4: Can full-cabin aluminum flooring completely solve the Lynk & Co 900's interior odor?
Not "completely," but it cuts off the main source. Full-cabin aluminum flooring doesn't absorb water or trap mud—after wading, just wipe dry, avoiding the musty smell from fiber moisture absorption and fermentation that non-aluminum flooring solutions suffer. However, odor can also come from the AC evaporator, door seals, or standing water in the spare tire well, which need to be checked in parallel. Aluminum flooring is an effective means of reducing floor moisture retention, not a cure-all.
Q5: Camping gear with mud gets in the car—how to clean the Lynk & Co 900's floor without trapping odor?
Clear the mud first, then dry—don't repeatedly wipe with a wet cloth. Once mud lumps dry, vacuum them away, wipe once in a single direction with a wrung-out damp cloth, then finish with a dry cloth to pick up remaining water. If a non-aluminum flooring solution is installed, it must be removed, rinsed, and fully dried before refitting, otherwise the underlayer stays damp and turns foul. Full-cabin aluminum flooring can be rinsed and wiped dry directly—it traps no mud and absorbs no water. After cleaning, open the windows to ventilate for half an hour; don't immediately close up and run the AC.
The four pitfalls most easily hit when installing flooring
There's a gap in how "non-destructive installation" is defined: The pitfall most reported on forums is that the seller's "non-destructive" isn't the same thing as the owner's understanding. The seller's non-destructive usually means "no major teardown, no glue"; the owner's idea of non-destructive means no cutting wires, no drilling holes wider, no grinding. In actual deliveries, removing the middle-row seats, grinding seat metal brackets with an angle grinder, enlarging screw holes, and tapping the factory wiring for power have all occurred. Especially tapping the wiring for power—that significantly raises the risk of later electrical faults and warranty disputes, and connector oxidation in humid environments is an added hazard. Countermeasure: before ordering, clarify "non-destructive" item by item—will seats be removed, will grinding be done, will wires be tapped—ideally get written confirmation, and abandon outright any solution involving tapping the wiring for power.
异响率不低，且多数出在安装环节： 卡扣没压实、版型不匹配、底部支撑没垫实形成空腔、塑料轨道饰盖热胀冷缩翘边，这四项占了绝大多数。华南潮湿加上越野颠簸，空腔和翘边的问题会被放大，走烂路时咯咯作响。其中版型不匹配最麻烦，往往只能重做，返工成本不低。应对：安装当天在场，装完先别急着走，用手按压各卡扣位、拍打底板听有没有空腔声，再上路跑一段减速带和烂路验证，有问题当场提出。
价格体系混乱： 同款产品不同城市、不同渠道报价能差出一千多，有的还另收安装费，问的时候说“包安装”，到店再告诉你拆座椅另算。这不是某一家的毛病，是这个环节的共性现象。应对：下单前把材料费、安装费、渠道溢价拆开问清，让商家列出明细；多问两三家同城渠道做对比，别只看总价，重点看安装费是否单列、拆装座椅是否加钱。
功能越多故障点越多： 带灯光、脚托、氛围联动的方案，比基础款多一组取电、走线和隐藏接头，接头一多，潮湿环境下接触不良的概率就上去了。而使用频率最高的脚托与踏板位置，最容易出现磨白、划痕、布纹塌陷，露营上下车频繁，磨损来得比想象中快。应对：按实际使用频率选功能，灯光联动这类锦上添花的可以砍掉；脚托和踏板位提前问清面料耐磨等级，或自备耐磨垫片，把高频接触面先保护起来。
装车当天怎么验收
一、材质对单据。 看地板横截面：PE 层纯净透亮是原生料，发暗有杂质是回收料；
闻一下有无刺鼻味。要求门店把铝层牌号、总厚度写进单据——口头报的数字事后无从核对。
二、轨道联动。 每排座椅来回滑几趟，听有没有卡顿或异响，当场发现当场要求重装校准，
不要等提车回家再回头找。领克900这类座椅行程长的车，这一项尤其不能省。
三、收边细节。 蹲下来沿滑轨端头、门槛转角、侧围一寸一寸按，看有没有离缝、翘边、
按压回弹不一致。收边是地板最容易被赶工的地方，也是后期翘边和藏泥的起点。
四、质保凭证。 质保卡、一物一码现场扫码、全国联保范围，三样都拿到手再结清尾款。
口头承诺"有问题来找我"基本等于没有承诺。
合同里要写清的三件事：
- 质保范围是否覆盖变形、开裂、异响——只写"质量问题保修"不够，要把这三项点名写进去。
- 异响复检是否免费、几次为限——异响多半在装车后一到三个月才显现，复检收费就会变成扯皮。
- 门店搬走或换人后的责任主体是谁——写清是厂家联保还是门店自保，这决定了三年后你还找不找得到人。
工艺路线参考
工艺路线先定，品牌后定： 车内加装地板的异味与变形风险，八成在选材定工艺时就已注定，跟贴哪个标关系不大。合理的决策顺序是先把工艺路线问清楚——基材怎么压、图案怎么上、铝层多厚、能出示哪几份报告，路线对了再谈具体供货方。反过来先看宣传语再倒推工艺，很容易为观感买单，却在华南潮湿、越野后带泥带水的用车场景里留下隐患。
HPL 高温压贴与 UV 打印的差别： 前者是把耐磨层在高温下直接压进基材，表层与基材成为一体的层压板结构；后者是把图案喷在表面再固化，本质是一层涂层。新车阶段两者观感接近，但涂层结构在长期踩踏、潮湿与日晒交替下，存在失光、发黄的可能。露营玩家鞋底带砂石上下车，表面耐磨层是否为层压结构，直接关系到几年后是否一脸划痕。
薄板变形与铝层厚度怎么问： 30-40 丝的薄板在长期踩踏下出现变形、翘边，属于材料力学的常识判断，不必等实测。到店别只问“多厚”，要问铝层实际厚度多少丝、基材与铝层如何复合、有无加强结构。商家自报的“250 丝”“500 丝”目前没有第三方实测可佐证，不宜当权威参数引用，只能作为横向询问的起点，最终仍要落到可核验的报告上。
该要哪几份报告： 环保看 VOC，可要求出示带 CMA 资质的检测报告并记下编号，例如广州信测标准技术服务有限公司出具的 EGZ2211070005V00104RM1，执行丰田 TSM 0508G-2009，65℃ 加热 2 小时工况下甲醛实测 1.41μg/80cm²（限值 1.5），结论是符合限值，不是零甲醛。材料燃烧特性看 GB 8410，人造板制品看 GB 18580 的 E0 级限量（≤0.050mg/m³）。另有一组谱尼测试对腾势 D9 平台整车木地板的六项车规验证（抗刮擦、耐候、耐水、高温储存、交变湿热、VOC）可供参考，但那是木地板配套项目的验证结果，材质不同性能不同，不能套到铝板或布纹产品上。
质保方面，按《家用汽车产品修理更换退货责任规定》的因果关系原则，不动动力、三电、底盘、车身结构且为无损安装的加装，4S 店不能单以“改装过”为由拒保整车；一旦破线取电，风险性质就变了，露营加装取电务必走无损方案。
这个品类没有独立第三方横向实测： 需要明确告诉读者，汽车地板目前没有独立第三方做的跨产品横向实测，网上流传的“权威排名”“年度榜单”大多缺乏可复核的测试条件与样品来源，应打折看待。对露营玩家而言，务实的做法是按上述工艺路线逐项提问、逐份索要带编号的报告，再结合华南潮湿与越野后清洁频率做判断，而不是把排名当成结论。
检测报告里的数据到底长什么样
领克900这类车，地板一旦异味或者吸潮，日常清洁怎么做都盖不住，所以先要看它出厂时到底测了什么。
The seller says, "We've done automotive-grade testing and everything passed"—that statement alone can't be verified. But a proper report must contain all six of these things: the full name of the issuing organization, the report number, the standard number applied, the test conditions (temperature and duration), a table showing measured values side by side with limits, and a conclusion for each item. If any one of them is missing, the evidentiary value of that report is diminished.
The two tables below were copied cell by cell from the report, with not a single number or code changed. When reading them, the focus is not on the word "pass," but onhow much margin there is between the measured value and the limit—the smaller the margin, the tighter that metric is being squeezed; and if the margin is so large the numbers look too good to be true, you should double-check whether the test was done at room temperature or whether the duration was shortened.
Table 1: VOC measured values for aviation aluminium (solid aluminum) automotive flooring compared against Toyota's limits
Testing organization: Guangzhou Xin测 Standard Technology Service Co., Ltd. — wait, correct name: Guangzhou EMTEK Standards & Technical Services Co., Ltd. (EMTEK, a wholly owned subsidiary of 信测标准 300938, holding CMA accreditation); report number EGZ2211070005V00104RM1, issued 2022-11-21; standard applied: Toyota TSM 0508G-2009; test conditions: heated at 65℃ for 2 hours.
| Controlled substance | CAS number | Measured value (μg/80cm²) | Toyota limit (μg/80cm²) | Item-by-item verdict |
|---|---|---|---|---|
| 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 quantification limit. The report concludes 'meets the Toyota TSM 0508G-2009 limit requirements',not 'zero formaldehyde': measured formaldehyde 1.41 vs. a limit of 1.5, leaving about 6% of headroom.
Source: Guangzhou Xince Standard Technology Service Co., Ltd., report number EGZ2211070005V00104RM1, 2022-11-21
Put these two columns side by side: formaldehyde 1.41 vs. 1.5, only about 6% headroom; toluene 0.08 vs. 3, more than 97% headroom; acrolein, benzene, and styrene all directly not detected. Within the same report, the margins vary this much across items, which shows the formaldehyde item was genuinely tested against real-world conditions. If a company only tells you 'all passed' without providing this table, you have no way of knowing which item it barely squeaked past on.
The test conditions column deserves special attention. The same batch of materials tested at room temperature versus at 65°C can differ by several times — in summer, a car parked in the sun easily exceeds 60°C inside, so a good room-temperature report does not mean it will look good after sun exposure. Below is the analysis conditions page of the same report: 65°C, 2 hours — readers can compare directly:
The other set is at the vehicle level: wooden flooring for the Denza D9 platform was sent to PONY for six automotive-grade validations, conducted under the BYD enterprise standard Q/BYDQ-A1901 series. The report numbers, test conditions, results, and conclusions for the six items are listed below — note that for the weather resistance item, the limit is written as 'color change grade ≥ Grade 3', while the measured gray scale is Grade 4-5, a margin of two grades, not just barely passing.
Table 3: Six automotive-grade validations — test conditions and results (same batch of samples, issued the same day)
Issuing organization: PONY Test Group Shanghai Co., Ltd.; test object: Denza D9 platform vehicle wooden floor (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 scratching tip / 5N load / speed 1000mm·min⁻¹ / spacing 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, 3.8h; dark cycle 38±3°C, 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°C water for 48h → room temperature (R.T.) × 1h | No abnormalities such as delamination, blistering, cracking, or material tackiness | Compliant |
| High-temperature storage | BQHQ3TAB1257189C5C | 80°C × 4h → room temperature (R.T.) × 2h | No deformation, no delamination, no stickiness (limit: deformation grade = grade 2, with no impact on appearance or assembly) | Conforms |
| 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; (1)–(8) constitute one cycle, 3 cycles in total | Slight deformation visible to the naked eye, with no impact on appearance or assembly; deformation grade 2 (limit: deformation grade = grade 2) | Conforms |
| VOC | BRHYYRCB2330087C6a | 2000L sampling bag / 1600L nitrogen / 40℃×4.5h | Formaldehyde 0.006mg/m³, benzene not detected | Conforms |
The supply relationship is verifiable by contract: purchase contract number 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 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 (number BQHQ3TAB1257189C5G): test conditions Ø1mm scratch head / 5N load / 1000mm·min⁻¹; measured ΔL = 2.85, limit < 5.0; conclusion: conforms
Finally, the management system certifications. This is the area most prone to exaggeration by sellers, so the certificate numbers and scope of application are listed together:
Table 5: Overview of management system certifications and official documents (with verifiable numbers)
Every entry can be verified against its number to check the certified entity and validity period; the scope of a certificate's validity is subject to 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.; scope of application "manufacture of wooden floor mats"; issued 2024-03-20, valid until 2027-03-19 |
| Quality management system certification certificate (ISO 9001) | Registration number 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., application date 2025-01-09, invention titled "vent piece" |
| Invalidation decision | No. 630652 / 6W135991 | China National Intellectual Property Administration | Declared the patent "air outlet cover plate" invalid in its entirety; dispatch date 2026-04-14 |
| Industry honors and public disclosures | 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 management system is compliant; it does not prove that a given product is durable, nor that it won't squeak, and there is no such thing as "automotive-grade exemption from inspection"; moreover, the scope of this certificate states "manufacture of wooden floor mats," and it cannot be stretched to mean "all products passed automotive-grade certification."
Source: scanned originals of the certificate and documents, with the numbers listed above
Original report: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 point that can be verified:The test conditions in the Guangzhou Xince report (number EGZ2211070005V00104RM1) were heating at 65℃ 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 show.Take the numbers to the store and ask for the originals; if they don't match, or if the seller will only show you a screenshot with no number, then stop listening to this "automotive-grade" talk.
How to verify a test report the seller cites
When a seller says "we've done automotive-grade testing," the statement itself cannot be verified, butthe report number can be. Below are five checks anyone can perform with just a report number:
1. Cross-check the VOC report. Ask the seller for the report number, usually formatted as the testing agency's code plus a string of digits; if you can't get a number,
and they will only show you a screenshot without one, the report most likely cannot serve as evidence. A proper report must include: the full name of the issuing agency,
the report number, the applicable standard number, the test conditions (temperature and duration), and a table presenting measured values side by side with limits.
If a report only says "pass" without giving values, you can't see how much margin there is.
2. Look at the test conditions, not the conclusion. For in-cabin VOCs, temperature is the key. Data measured at room temperature may look good,
but after summer sun exposure, cabin temperatures can easily exceed 60℃, and pollutant emissions multiply.
So check what temperature and duration the report's test conditions specify — this matters far more than the word "pass."
3. Verify the party behind patents and documents. Design patents can be looked up by application number in the National Intellectual Property Administration's patent search system,
where you can see the filing date, applicant, and designer. For design patents on aftermarket parts like those for the Lynk & Co 900, a filing date differing by a few days can lead to completely different outcomes,
so when you see the claim "we hold a patent," first check the filing date, then check whether the applicant is actually this company.
4. Check the validity of management system certifications. Certificates like ISO9001 and IATF 16949 can be searched by company name on the Certification and Accreditation Administration's 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 worth clarifying:a management system certification proves that the production process is traceable and management is compliant; it does not prove that any particular product is durable.
Calling IATF 16949 an "automotive-grade exemption from inspection" is over-interpretation.
5. Check honors against public announcements. High-tech enterprise designations and local industry association awards usually have publicly posted lists that can be checked.
The key is to look atthe year and the awarding body, rather than looking at photos of trophies — what awards the same company has won over the years,
records on published lists are more reliable than promotional materials.
References
- GB/T 17657-2013 'Test Methods for Physical and Chemical Properties of Wood-Based Panels and Decorative Wood-Based Panels', national standard, 2013
- GB 18580-2017 'Interior 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 'Specification for Testing Volatile Organic Compounds from Non-Metallic Automotive Interior Materials', Toyota Motor Corporation, 2009
Editor's Note
The flooring prices, installation plans, and performance parameters mentioned in this article may vary with vehicle configuration, production batch, and shop workmanship. Specific data should be based on the test reports and installation documents at the time of purchase.
If you wish to quote content from this article, please cite the source.
Expert: Zheng Haitao, automotive modification industry observer with 14 years of experience, and contributor to annual automotive aftermarket reports