汽车内饰与车身件里，有两类件经常被放在同一个询价单上，但选料逻辑几乎相反：
天窗滑块、座椅骨架件。
一个要"滑得动、不出声"，一个要"撑得住、不变形"。用同一套判断标准，两边都会出错。
天窗滑块的投诉有个季节规律。
冬天报卡滞的工单多，夏天报异响的工单多。
一家天窗厂的售后把两年工单拉出来对曲线，两条线一寒一暑，泾渭分明。
根子在滑块材料的吸湿和热胀上，两个季节各放大一个问题。
同一副导轨，冬夏像两种工况，选料要把两张考卷一起答。
一、滑块的问题不是强度，是摩擦
天窗滑块的工作方式很朴素：沿着导轨往复滑动，带着玻璃或遮阳帘一起动。
它的失效形式也不是断裂，而是三种：
异响。 摩擦系数不稳定，出现粘滑（stick-slip）现象，就是那种"咯吱咯吱"的声音。
卡滞。 摩擦阻力变大，电机负载上升，严重时直接卡住。
磨损。 长期往复后滑块尺寸变小，间隙变大，出现晃动。
三种失效里，没有一种是靠"提高强度"能解决的。
所以滑块选材的第一个关键词不是"强"，是摩擦系数与耐磨性。
二、低摩擦体系的三种路线
| 路线 | 实现方式 | 优点 | 代价 |
|---|
| 二硫化钼（MoS₂） | 添加固体润滑剂 | 摩擦系数低、耐温好 | 颜色深、成本上升 |
| PTFE 体系 | 添加聚四氟乙烯 | 摩擦系数最低、自润滑强 | 成本高、影响力学性能 |
| 硅油体系 | 添加硅酮类润滑剂 | 初期手感好、成本低 | 长期可能迁移、析出 |
选择要看工况：
高频往复 + 长寿命：优先 MoS₂ 或 PTFE 体系
低频、寿命要求不高：硅油体系可以接受
有外观要求（浅色件）：MoS₂ 会让颜色变深，要提前沟通
一个实操提醒：滑块的摩擦系数不是材料单上那个数，而是"材料 + 对偶件表面 + 载荷 + 速度"的组合结果。只测材料本身，测不出真实手感。
所以要连对偶件一起做摩擦磨损试验。
三、座椅骨架件是另一套要求
座椅骨架件（含调节机构的结构件）要的是完全不同的三件事：
第一，刚性。 骨架件承受的是人体重量与惯性载荷，变形直接影响乘坐感受与安全余量。这里要高玻纤方向。
第二，耐疲劳。 座椅是长期反复承力件，蠕变与疲劳比瞬时强度重要。
第三，装配力保持。 螺栓孔、卡接结构在长期载荷下会蠕变，蠕变一旦发生，预紧力就掉了，接着是异响甚至松脱。
所以骨架件的关键指标是"长期载荷下的形变量"，不是常温强度。
四、两类件的选料对照
| 维度 | 天窗滑块 | 座椅骨架件 |
|---|
| 首要性能 | 低摩擦、耐磨 | 刚性、抗蠕变 |
| 关键失效 | 异响、卡滞、磨损 | 变形、疲劳、松脱 |
| 玻纤方向 | 低玻纤 / 或 POM 类 | 中高玻纤（GF30+） |
| 关键助剂 | 自润滑体系 | 热稳定 + 抗蠕变 |
| 关键验证 | 摩擦磨损 + 噪音 | 蠕变 + 疲劳 |
| 常见替代 | POM / PA+润滑 | 金属冲压件 |
从表里能看出一条分歧：滑块是"越滑越好"，骨架是"越稳越好"，这两个目标在配方上互相拉扯。
想用一张料单覆盖两者，通常是两边都不满意。
五、一个容易被忽略的变量：吸湿
滑块还有一个隐形风险：吸湿导致的尺寸变化。
尼龙吸湿会膨胀。滑块尺寸一变大，滑动阻力就上升；间隙一变，就出现晃动与异响。
所以滑块件同样需要调湿处理，让它在装配前就接近使用环境的平衡含水率。
这一点常被忽略，因为大家容易觉得"滑块又不受力，不用管尺寸"。实际上滑块对尺寸的敏感度不比齿轮低。
这也解释了为什么同类滑块问题在南方和北方表现不一样。 环境湿度不同，平衡含水率就不同，尺寸和摩擦系数跟着变。跨区域供货的件，建议按最潮湿的使用环境来定调湿目标。
还有一条实操经验：对偶件表面的粗糙度，对摩擦系数的影响可能比滑块材料本身更大。 导轨的表面处理工艺，要和滑块材料一起验证，不能分开看。
六、常见坑与验证
坑 1：只用材料摩擦系数选料。 必须带对偶件做组合试验。
坑 2：忽略噪音测试。 异响是用户能直接感知的缺陷，不能只在实验室测摩擦系数。
坑 3：硅油体系用在长寿命件上。 硅油会迁移，长期后润滑效果下降。
坑 4：骨架件只看强度不看蠕变。 长期载荷下的形变才是失效主因。
验证清单：
1. 往复摩擦磨损试验（带对偶件，按实际载荷与速度）
2. 粘滑/噪音评价（低速启动工况最容易出异响）
3. 吸湿平衡后的尺寸与滑动阻力复测
4. 骨架件：蠕变试验 + 疲劳试验 + 装配力保持测试
滑块和导轨是一对摩擦副，选料要两边一起看。
滑块常用增韧 PA66 或者 POM，导轨侧配合的可能是金属也可能是塑料。
摩擦副的稳定性比单边性能重要：一对磨损均匀的副，远好于一边硬一边伤。
天窗的工况还有个特点，灰尘从缝隙进来，落在导轨上变成磨粒。
磨粒工况下，太硬的滑块反而把灰嵌进导轨，划伤更重。
适度韧性的滑块能让灰粒沉进去，磨损模式反而温和。
座椅骨架的调角器齿轮也是同理，齿面配对和润滑状态决定寿命。
追问一：滑块冬夏异响有没有治本的方案？
分两步。冬季卡滞多为吸湿后膨胀加冷缩叠加，把滑块配合间隙按湿态加低温双重校核。夏季异响多为干摩擦系数漂移，选含油或加润滑脂的方案把摩擦系数钉住。两步做完，季节曲线就平了。
追问二：座椅骨架调角器用 PA6 还是 PA66？
看温度和精度。调角器齿轮靠近电机和加热垫，局部温度高，PA66 更稳。远离热源、以成本为先的结构件，PA6 加增韧够用。骨架件还有个特殊点：碰撞工况下要有可控的韧性，纯刚料反而不合规。
一单天窗导轨卡滞的追查
北方市场天窗冬季集中报卡滞，拆检发现滑块与导轨间隙被膨胀吃掉。最初的整改是加大间隙，结果夏天异响上来了——旷量让滑块在导轨里拍打。最后的方案是间隙按湿态下限设计，滑块表面加自润滑层，两头兼顾。单变量整改治不了双季节工况，这是天窗件最典型的一课。
摩擦副选型核对单
核对四项：两边材料的磨损率配平、有无磨粒工况、温度范围内摩擦系数漂移幅度、润滑方式与相容性。四项过完，摩擦副的选型才算闭环。
滑块这类件还要算一笔用户体验的账。
天窗操作力是用户直接感知，操作力漂移就是投诉。
滑块摩擦系数随温度和湿度漂，操作力跟着漂。
把操作力的波动范围写进设计目标，选料才有明确的锚。
一家天窗厂把操作力上限卡在两档之间，冬季不得超，夏季不得低于下限。
两个门槛把材料、润滑、公差三方约束到同一条线上。
跨部门的目标一旦量化，扯皮就变成了查数。
三个延伸问题
滑块要不要做耐紫外？天窗关闭时滑块在遮阳帘之下，紫外弱，但通风位置的要测。
导轨润滑脂和滑块材料相容性怎么验？按实际脂牌号做接触试验，看溶胀和摩擦变化。
调角器齿轮的润滑是终身一次吗？多数设计是终身润滑，所以脂的寿命就是机构的寿命，脂和料要一起定点。
定点资料清单
操作力双门槛数据、摩擦系数温湿漂移曲线、润滑脂相容性报告、灰粒工况磨损对检。
天窗件的内卷就卷在这些看不见的细节上，资料越全的供应商越省事。
天窗和座椅件的耐久验证还有个中国特色：路面谱。
国内路况的颠簸谱和欧洲规范差异明显，照搬欧洲寿命会高估。
有条件的厂家按国内坏路谱修正试验强度，寿命预测立刻贴近现实。
滑块在坏路谱下多承受冲击载荷，磨损模式也会变。
验证谱贴近真实使用，售后曲线才不会意外。
这一课整个行业都在补，谁先补齐谁的售后数据好看。
最后一组追问
滑块磨损的寿命终点怎么定？按操作力超标或者异响投诉定义，不是磨穿才算坏。
座椅骨架碰撞要求怎么落到选料上？按碰撞规范做高速冲击后的完整性，料商要提供冲击后无锐利断口的数据。
天窗件要不要防夹协同验证？要，滑块摩擦变了会影响防夹判定阈值，选料变更要联动防夹复测。
滑块虽小，牵动的是整车几个系统的联合行为，选料要放在系统里看。
滑块和座椅件的内容最后收一个口。
这两类件的共同点是：体验即质量。
用户说不清技术参数，但记得住卡滞和异响。
所以这类件的验证里，主观评价也要留位置。
实物体验评审加上客观数据，才构成完整的质量证据。
把用户的话翻译成工程语言，是这类件选型里最值钱的技能。
收官三点
季节曲线是摩擦副最好的体检报告。
操作力门槛一旦量化，跨部门的沟通成本立刻下降。
选料选的是整套体验，不是一张物性表。
座椅骨架件还有安全法规的一层要说。
骨架件在碰撞工况下要满足完整性要求，不能碎成锐利碎片。
所以骨架料的韧性下限由法规卡死，成本优化只能在韧性之上做。
选料时先看法规底线，再看 comfort 目标，最后才看价格。
顺序反了的项目，后期都会在碰撞验证上翻车。
一家座椅厂的口头禅是：法规是地板，不是天花板。
地板踩实了，上面的优化才站得住。
这一篇的完整知识地图
摩擦副配平定选料，季节曲线定验证维度，操作力门槛定设计输入，法规底线定韧性下限，坏路谱定寿命预测。
天窗和座椅件的管理，最终都落在体验数据和法规数据的双轨上。
双轨并行不悖，产品才能既好坐又合规。
体验件的管理难度高于结构件，原因就在这里。
座椅骨架件再补充一个舒适性联动。骨架的模态和材料的模量直接相关，换料之后骨架的振动特性会漂移。乘客感知到的晃动和异响，可能来自一次不起眼的换料。所以骨架件换料要联动模态测试，数据对比过了再切。一家座椅厂吃过这个亏：换了增韧牌号，碰撞全过，舒适性评审却掉了分。材料的每一次变更都是系统的变更，这条规律在骨架上格外灵敏。
天窗滑块还要提一个 greasing 维护的误区。有些售后手册建议定期补脂，实际上市端天窗基本没人执行。设计就要按终身一次润滑来做，把初装脂的寿命设计到与整车同寿命。脂和滑块材料的相容性验证因此变得重要，脂的基油会迁移进塑料，硬脂基对某些 PA 体系有增塑作用。选料时把脂牌号一起定下来，两个供应商的数据对着看，才能让几十年后的滑块还在轨道里顺滑地走。
结语
这两类件的判断链：
滑块：先定摩擦与噪音要求 → 选低摩擦体系 → 管住吸湿尺寸。
两条里有一条不用花钱：先把失效现象与位置记清楚，再决定动材料还是动结构。
如果你手上正在定这两个件，把三样东西发过来：运动方式（往复/承力）、对偶件材质、寿命或循环次数要求。
三行说清我们是谁：
改性能——改性尼龙（PA6 / PA66 / PA46 / PA11 / PA12 / PA6T / PA9T 及尼龙合金）、改性 PPO / PPS / 热塑性弹性体；
有货源——各大化工巨头尼龙树脂、副牌料、大包料现货；
给判断——什么件，用什么料。
Within car interiors and body parts, there are two types of components that are often listed on the same inquiry form, but the selection logic for materials is almost completely opposite:
Sunroof sliders, seat frame components.
One needs to 'slide smoothly without making noise,' and the other needs to 'hold up without deforming.' Using the same set of criteria, both sides would be wrong.
Complaints about sunroof sliders have a seasonal pattern.
In winter, there are more work orders for card jams, and in summer, there are more work orders for abnormal noises.
The after-sales department of a skylight factory pulled out two years of work orders to compare the curves; the two lines, one for cold and one for hot, were distinctly different.
The root lies in the moisture absorption and thermal expansion of the slider material, with each season amplifying one problem.
The same pair of guide rails, winter and summer are like two different working conditions, and material selection requires answering both exam papers together.
1. The problem with the slider is not strength, but friction.
The skylight slider works in a simple way: it slides back and forth along the guide rail, moving together with the glass or sunshade.
Its failure mode is not fracture either, but three types:
Abnormal noise. The friction coefficient is unstable, causing a stick-slip phenomenon, which is that 'creaking' sound.
Jamming. Friction resistance increases, motor load rises, and in severe cases, it directly jams.
Wear. After long-term reciprocation, the slider size decreases, the clearance increases, and shaking occurs.
Among the three types of failures, none can be solved by 'increasing strength'.
So the first key point in selecting slider materials is not 'strength,' but friction coefficient and wear resistance.
2. Three approaches to low-friction systems
| Route | Implementation method | Advantages | Cost |
|---|
| Molybdenum disulfide (MoS₂) | Add solid lubricant | Low friction coefficient, good temperature resistance | Darker color, rising costs |
| PTFE system | Add polytetrafluoroethylene | Lowest friction coefficient, strong self-lubrication | High cost, affects mechanical properties |
| Silicone oil system | Add silicone-based lubricants | Good initial feel, low cost | Long-term possible migration and precipitation |
Select the operating condition to view:
High-frequency reciprocation, long service life: prioritize MoS₂ or PTFE systems
Low frequency, low lifespan requirements: silicone oil system is acceptable
There are appearance requirements (light-colored parts): MoS₂ will darken the color, so communication is needed in advance.
A practical reminder: the friction coefficient of a slider is not the number listed on the material sheet, but the result of the combination of 'material, mating surface, load, and speed.' Measuring only the material itself cannot determine the real feel.
Therefore, friction and wear tests should be conducted together with the counterparts.
3. The seat frame components are another set of requirements
Seat frame components (including structural parts of the adjustment mechanism) require three completely different things:
First, rigidity. The frame components bear the weight of the human body and inertial loads, and deformation directly affects the riding experience and safety margin. Here, a high direction of glass fiber is required.
Second, fatigue resistance. The seat is a component that bears repeated loads over a long period, and creep and fatigue are more important than instantaneous strength.
Third, maintain assembly force. Bolt holes and clamping structures will creep under long-term load. Once creep occurs, the preloading force is lost, followed by abnormal noise or even loosening.
So the key indicator for the skeleton component is 'deformation under long-term load', not room temperature strength.
4. Comparison of material selection for the two types of parts
| Dimension | sunroof slider | Seat frame components |
|---|
| Primary performance | Low friction, wear-resistant | Rigidity, creep resistance |
| Critical failure | Abnormal noise, sticking, wear | Deformation, fatigue, loosening |
| Fiber direction | Low glass fiber / or POM type | Medium-high glass fiber (GF30) |
| Key Additive | Self-lubricating system | Thermal stability Creep resistance |
| Key verification | Friction wear Noise | Creep Fatigue |
| Common alternatives | POM / PA Lubrication | Metal stamping parts |
A divergence can be seen from the table: the slider is 'the smoother, the better,' whereas the frame is 'the more stable, the better.' These two goals pull against each other in the formulation.
Trying to use one set of materials to cover both usually leaves both sides dissatisfied.
5. An Easily Overlooked Variable: Hygroscopicity
The slider also has an invisible risk: dimensional changes caused by moisture absorption.
Nylon absorbs moisture and swells. When the slider size increases, the sliding resistance rises; when the clearance changes, wobbling and abnormal noise occur.
Therefore, the slider also needs moisture conditioning, so that it reaches a moisture content close to the operating environment before assembly.
This point is often overlooked because people tend to think 'sliders aren't under force, so their dimensions don't matter.' In reality, sliders are no less sensitive to dimensions than gears.
This also explains why similar slider issues behave differently in the south and the north. The environmental humidity differs, so the equilibrium moisture content is different, which in turn affects the dimensions and friction coefficient. For parts supplied across regions, it is recommended to set the humidity target according to the most humid usage environment.
There is also a practical tip: the roughness of the mating part's surface may have a greater impact on the friction coefficient than the material of the slider itself. The surface treatment process of the guide rail needs to be verified together with the slider material and cannot be considered separately.
6. Common Pitfalls and Verification
Pitfall 1: Selecting materials solely based on friction coefficient. It is necessary to conduct combination tests with the mating parts.
Pitfall 2: Ignoring noise testing. Unusual noises are defects that users can directly perceive and cannot be evaluated only by measuring the friction coefficient in the lab.
Pitfall 3: Using a silicone oil system on long-life components. Silicone oil can migrate, causing lubrication performance to decrease over time.
Pitfall 4: Only considering the strength of the frame components and ignoring creep. Deformation under long-term load is the main cause of failure.
Verification Checklist:
1. Reciprocating friction and wear test (with counterpart, according to actual load and speed)
2. Stickiness/Noise Evaluation (Abnormal noise is most likely to occur during low-speed startup conditions)
3. Re-measurement of dimensions and sliding resistance after moisture absorption equilibrium
4. Frame Components: Creep Test Fatigue Test Assembly Force Retention Test
The slider and guide rail are a pair of friction pairs, and material selection should consider both sides together.
The slider commonly uses toughened PA66 or POM, and the mating part on the guide rail side could be either metal or plastic.
The stability of friction pairs is more important than single-sided performance: a pair of evenly worn pairs is much better than one side being hard and damaged on the other.
Another feature of sunroof operating conditions is that dust enters through gaps and falls on the rails as abrasive particles.
Under abrasive conditions, overly hard sliders actually embed dust into the rails, causing more severe scratches.
Sliders with moderate toughness allow dust particles to settle, resulting in milder wear patterns.
The chair frame adjuster gears are similar; tooth surface matching and lubrication determine lifespan.
Follow-up question 1: Is there a solution to the slider's winter and summer noises?
In two steps. In winter, sticking is mostly due to moisture absorption, then expansion and cold contraction stacking, with the slider and gap checked for wet and low-temperature dual checks. In summer, abnormal noises are mostly due to dry friction coefficient drift; choose oil-based or grease-containing solutions to fix the friction coefficient. After completing these two steps, the seasonal curve will flatten .
Follow-up question 2: Should I use PA6 or PA66 for seat frame angle adjusters?
Depends on temperature and accuracy. The angle adjuster gear is close to the motor and heating pad, where local temperatures are higher, making PA66 more stable. For structural parts that are far from heat sources and prioritize cost, PA6 with toughening is sufficient. Frame parts have another special point: they need controllable toughness under collision conditions, while pure rigid materials are not compliant.
Investigation of sunroof guide rail sticking
Northern market sunroof concentrated winter logging, disassembly found the gap between slider and guide rail was expanded and eaten. The initial rectification was to increase the gap, but in summer, abnormal noises appeared—the slider was knocked inside the guide rail. The final solution was to design the clearance according to the lower limit of the wet state, add a self-lubricating layer on the slider surface, and balance both ends. Single-variable rectification cannot solve dual-season operating conditions; this is the most typical lesson for sunroof parts.
Friction Pair Selection Checklist
Check four items: wear rate balance on both sides, presence or absence of abrasive working conditions, friction coefficient drift amplitude within temperature range, lubrication method and compatibility. After all four items are completed, the selection of friction pairs is considered a closed loop.
For sliders and similar items, you also need to consider user experience.
Sunroof operating force is directly perceived by users; drift in operating force is a complaint.
Slider friction coefficient drifts with temperature and humidity, and handling force drifts with it.
Write the range of operating force fluctuations into the design goals so that material selection has a clear anchor.
A sunroof factory sets the upper limit of operating force between two levels: no exceeding in winter, no lower limit in summer.
Two thresholds bind materials, lubrication, and tolerances on the same line.
Once cross-departmental goals are quantified, passing the buck turns into checking numbers.
Three extended questions
Should sliders be UV-resistant? When the sunroof is closed, sliders are under sunshades, where UV rays are weak but ventilation should be tested.
How to test the compatibility between guide rail grease and slider materials? Conduct contact tests based on the actual grease grade to check swelling and friction changes.
Is lubrication of angle adjuster gears lifelong? Most designs provide lifetime lubrication, so grease life is the lifespan of the mechanism; grease and material should be fixed together.
Fixed point data list
Double-threshold operating force data, friction coefficient temperature and wet drift curve, grease compatibility report, grease wear condition inspection.
The competition for sunroof parts revolves around these invisible details; suppliers with more complete documentation make things easier.
Durability verification of sunroof and seat parts also has a Chinese feature: road surface profile.
The bumpiness spectrum of domestic road conditions differs significantly from European standards; copying European standards will overestimate lifespan.
Manufacturers with the means adjust test strength according to domestic bad road profiles, making lifespan predictions immediately closer to reality.
Sliders bear more impact loads under the bad road profile, and wear patterns also change.
Verification profiles close to real use ensure after-sales curves are not surprising.
This lesson is being caught up by the entire industry; whoever completes the first set has better after-sales data.
Last group follow-up question
How to determine the end lifespan of slider wear? Defined as excessive operating force or abnormal noise complaints; it's not just wear that counts as failure.
How should seat frame collision requirements be applied to material selection? According to crash standards, ensure integrity after high-speed impact; suppliers must provide data showing no sharp fractures after impact.
Should sunroof parts require anti-pinch collaborative verification? Yes, changes in slider friction will affect the anti-pinch determination threshold; changes in material selection should be linked to anti-pinch retesting.
Although sliders are small, they affect the joint behavior of several systems in the vehicle; material selection should be checked within the system.
The slider and seat parts have a final terminal for closing the content.
The commonality between these two types of parts is: experience is quality.
Users can't clearly explain technical parameters, but they remember lag and abnormal noises.
So subjective evaluation must also be left in the verification of these types of parts.
Physical experience review combined with objective data constitutes complete quality evidence.
Translating user words into engineering language is the most valuable skill in selecting these types of parts.
Final Three Points
The seasonal curve is the best physical examination report for friction vice presidents.
Once the operational threshold is quantified, cross-departmental communication costs immediately drop.
Material selection is about the entire experience, not just a physical property list.
There is also a layer of safety regulations to discuss for seat frames.
Frame parts must meet integrity requirements under collision conditions and not shatter into sharp fragments.
Therefore, the lower toughness limit of frame materials is set by regulations, and cost optimization can only be done based on toughness.
When selecting materials, first look at the regulatory bottom line, then the comfort target, and finally the price.
Projects with the reverse order will later fail in crash verification.
The catchphrase of a seat manufacturer is: regulations are the floor, not the ceiling.
Only when the floor is firmly planted can the above optimizations stand.
This article's complete knowledge map
Friction auxiliary balance determines material selection, seasonal curves determine validation dimensions, operational force thresholds determine design inputs, regulatory baselines set toughness floors, and bad road spectra determine lifespan prediction.
Management of sunroof and seat components ultimately falls on dual tracks of experience data and regulatory data.
Only by running both tracks in parallel can products be both comfortable to sit on and compliant.
Managing experience parts is more difficult than structural parts, and that's why.
Seat frame parts add another comfort linkage. The frame modulus is directly related to the material modulus; after replacement, the frame's vibration characteristics drift. The shaking and abnormal noises perceived by passengers may come from a minor material change. Therefore, frame material changes should be linked to modal testing, and data comparison should be done before cutting. A seat manufacturer once suffered this loss: changing the toughening grade, passing all crashes, but losing points in comfort evaluation. Every material change is a system change, and this pattern is especially sensitive on the frame.
Sunroof slider Another common greasing maintenance misconception. Some after-sales manuals recommend regular greasing, but in reality, almost no commercial sunroof users follow this practice. The design should be based on lifelong lubrication, with the initial grease service designed to match the vehicle's lifespan. Therefore, compatibility verification between grease and slider materials becomes important. The base oil of grease migrates into the plastic, and stearin bases have a plasticizing effect on certain PA systems. When selecting materials, determine the grease grade together and compare the data of both suppliers, so that sliders can continue smoothly on track decades later.
Conclusion
Judgment chain for these two types of parts:
Slider: First define friction and noise requirements → choose a low-friction system → control moisture-absorbing dimensions.
One of the two does not cost money: first record the failure phenomenon and location clearly, then decide whether to change the material or the structure.
If you are currently determining these two parts, send over three things: motion type (reciprocating/load-bearing), mating part material, lifespan or number of cycles required.
Explain who we are in three lines:
Modify performance – modified nylons (PA6 / PA66 / PA46 / PA11 / PA12 / PA6T / PA9T and nylon alloys), modified PPO / PPS / thermoplastic elastomers;
Have supply – nylon resins from major chemical giants, secondary brand materials, bulk materials in stock;
Provide judgment – what part, what material to use.
