底盘护板石击就裂，泥水一冲就变脆。冲击韧性和耐候，没一起看就完蛋。
一句话结论：底盘护板，冲击韧性和耐候一起看
底盘护板是“被欺负”的件：石子崩、泥水泡、冬天冻。材料要冲击韧性、耐候、耐水——结论先给：底盘护板用 TPO 或高韧性 SEBS 基 TPE；低温冲击要求高，TPO 优先。
底盘护板的最大坑：差 10 分，成本差一倍。硬度差一点、韧性差一档，价格差一截——按工况定价，别只比单价。
底盘护板是底盘件：耐石击、耐泥水、耐低温。三关都要过——底盘件，别省韧性钱。
为什么 TPE：冲击可调加耐候
底盘护板用 TPE 的理由：冲击韧性可调、耐候好、可回收、注塑效率高——四条合起来，适合底盘护板。
低温冲击是核心：冬天底盘件最脆。低温冲击测试（按实际温度）写进验收——低温不过，冬天就裂。
耐石击不能省：石子崩、泥水冲。耐石击测试（按标准）要验——崩裂底盘护板，就是异响源。
工况拆解：石击、泥水、温度
石击工况：高速石子崩击。耐石击测试数据要验——崩裂、穿孔，都是问题。
底盘件天天泡泥水盐雾，腐蚀发脆是慢性病——耐水解、耐盐雾 48h+ 必测，漏了这项三年后崩裂不知道找谁。
温度工况：冬天 -30℃、夏天 70℃+。低温冲击加高温不变形——底盘件，温度不能赌。
对比表：TPO vs SEBS 基做底盘护板
| 维度 | TPO | SEBS 基 TPE |
|---|
| 冲击韧性 | 好 | 中上 |
| 耐候 | 强 | 中上 |
| 耐水 | 好 | 中上 |
| 成本 | 中 | 低 |
| 刚性 | 好 | 中 |
| 低温 | 好 | 中上 |
表格读法：TPO 在冲击和刚性上更稳；SEBS 基便宜但韧性要验证——底盘件，选成熟体系。
按车型定位选：家用车 SEBS 基够用，硬派越野 TPO 或加厚——定位不同，材料不同。
常见坑：韧性虚标和耐候漏测
坑一：韧性虚标。报告写冲击 40，实际 25——冲击数据按实测验收。
坑二：耐候漏测。底盘件晒不到，但冻得狠——低温冲击，冬天必测。
坑三：成本只看单价。差 10 分钱，返工差一倍——总账算清，贵料不贵。
底盘护板到货三笔账，石击必测
三问：低温按多少度、冲击按什么标准、耐盐雾多少小时。一验：按底盘实际工况打样——三问一验，供应商底细清楚。
冲击验证要实测：落锤、石击。实测最硬——报告再漂亮，一崩就裂就是白搭。
留样要成习惯：每批留样，冲击耐候按批次复测。批次换料先对比再放量——批次稳，客诉少。
延伸判断：底盘护板的石击测试，别省
底盘护板的石击测试，别省：石子崩击是底盘件的日常。石击测试（按标准）写进验收——崩裂，就是异响源。
石击测试要按速度：高速石击更狠。按实际车速验——速度对齐，数据才可信。
石击测试要分区域：正面受击区、边缘薄弱区。区域不同，崩击不同——分区域测试，才能覆盖。
石击与低温要联合测：冬天石击更脆。低温石击联合测试——联合条件，才是真实工况。
| 石击测试 | 条件 | 通过线 |
|---|
| 冲击能量 | 按车速对应 | 无裂纹 |
| 低温石击 | -30℃ 联合 | 无破碎 |
| 边缘区 | 重点受击 | 无开裂 |
| 盐雾后 | 48h 后测试 | 无腐蚀裂 |
表2读法：石击四条件，覆盖底盘真实工况。石击不过，就是异响源。
| 材料指标 | 要求 | 说明 |
|---|
| 低温冲击 | -30℃ 通过 | 冬天不裂 |
| 耐候 | 氙灯 1000h | 不脆不裂 |
| 耐盐雾 | 48h+ | 底盘必测 |
| 韧性 | 落锤通过 | 抗石击 |
表3读法：四指标对齐底盘工况。底盘件，韧性不能省。
石子高速崩击，崩裂就是异响源——耐石击按实际车速对应能量测，无裂纹无穿孔才放行。
TPO 冲击刚性更稳，SEBS 基便宜但韧性要验证——硬派越野上 TPO 或加厚，家用车 SEBS 基够用，按定位选。
常温冲击和低温冲击差别很大，按实际温度读数据——-30℃ 低温石击联合测，冬天底盘件最脆。
底盘护板的供应商，问四句：什么体系、低温按多少度、石击按什么标准、变更会不会通知。四句问完，底细清楚——问对问题，比压价有用。
打样时把底盘护板的石击按满载模拟一次：满载离地更低，石击更频。满载场景过了，空载更稳——模拟极限，比只看空载全面。
冬季路试含石击和盐雾，是底盘件的双重考验——路试过了量产才放心，满载离地更低石击更频，满载场景也要模拟。
科隆客户案例：回弹不足功能不达标，调参数过气味验收
无锡一家汽车零部件厂，底盘护板回弹不足，功能件性能不达标。科隆配合调整注塑参数（模温/料温/保压），气味等级通过客户验收标准。参数窗口对了，性能就稳了——工艺和配方，两头都要对。
小结
底盘护板这类部件，工况越早写全，选型越少返工，把石击和低温一起交给供应商，功夫在选型之前。
The chassis skid plate cracks from stone hits and becomes brittle when washed with mud and water. If you don't consider impact toughness and weather resistance together, it's doomed.
One-sentence conclusion: Look at the chassis guard, impact toughness, and weather resistance together.
The chassis skid plate is a 'bullied' part: hit by stones, soaked in mud and water, frozen in winter. The material needs impact toughness, weather resistance, and water resistance — here's the conclusion first: use TPO or high-toughness SEBS-based TPE for chassis skid plates; if low-temperature impact resistance is critical, TPO is preferred.
The biggest pitfall of the chassis skid plate: 10 points lower in quality, and the cost doubles. Slightly lower hardness, slightly lower toughness, and a big difference in price—pricing should be based on working conditions, not just unit price.
The chassis skid plate is a chassis part: resistant to stone hits, mud and water, and low temperatures. All three tests must be passed—chassis parts, don't skimp on toughness.
Why TPE: Impact adjustable and weather-resistant
Reasons for using TPE for the chassis guard: adjustable impact toughness, good weather resistance, recyclable, high injection molding efficiency — together, these four make it suitable for the chassis guard.
Low-temperature impact is the core: chassis parts are most fragile in winter. Low-temperature impact testing (according to actual temperature) should be included in acceptance—if it fails low temperature, it will crack in winter.
Stone impact resistance cannot be ignored: gravel breakage, mudwater collision. Stone impact resistance tests (according to standards) need to check——the cracked chassis skid plate, which is the source of abnormal noises.
Operating Condition Breakdown: Rock Impact, Mud and Water, Temperature
Stone impact condition: high-speed stone crushing impact. Stone impact resistance test data must be verified—cracking and perforation are both problems.
Chassis parts are exposed to muddy water and salt mist every day, and corrosion and brittleness are chronic problems—hydrolysis resistance and 48-hour salt spray resistance must be tested. If this test is skipped, no one will know who to hold accountable when it cracks after three years.
Temperature conditions: Winter -30℃, summer 70℃. Low-temperature shock combined with high temperature without deformation — chassis parts, temperature cannot be compromised.
Comparison Table: TPO vs SEBS Base Chassis Guard
| Dimension | TPO | SEBS-based TPE |
|---|
| Impact toughness | Good | Upper-middle |
| weather-resistant | Strong | Upper-middle |
| Water-resistant | Good | Upper-middle |
| Cost | middle | Low |
| Rigidity | Good | middle |
| Low temperature | Good | Upper-middle |
Table interpretation: TPO is more stable in impact and rigidity; SEBS is basically cheap but its toughness needs to be verified—for chassis parts, choose a mature system.
Choose according to the type of vehicle: for family cars, SEBS is sufficient, for rugged off-road vehicles, TPO or thicker material—different positioning, different materials.
Common pitfalls: exaggeration of toughness and omission of weather resistance testing
Pitfall 1: Overstated toughness. The report states an impact of 40, but the actual is 25 — impact data should be accepted based on measured values.
Pitfall 2: Missing weather resistance tests. Chassis parts are not exposed to the sun, but they freeze severely—low-temperature impact tests are a must in winter.
Pitfall three: only looking at unit price for cost. A 10-cent difference can double rework costs—calculate the total account clearly, expensive materials are not necessarily costly.
Three entries for the arrival of the chassis guard plate, rock impact must be tested
Three questions: what temperature for low temperature, what standard for impact, how many hours for salt spray resistance. One test: make a prototype according to the actual conditions of the chassis — three questions and one test, the suppliers are well aware of the details.
Impact verification must be tested in practice: drop hammer, stone strike. No matter how good the report looks, if it breaks at the slightest impact, it's useless.
Making sample retention a habit: retain samples for each batch, and retest weather resistance per batch. When changing materials between batches, compare first before scaling up—the batch is stable, and customer complaints are few.
Extended judgment: When testing stone strikes on the chassis guard, don't skimp
Don't skimp on the chassis skid plate stone impact test: stone chips hitting are a daily occurrence for chassis components. The stone impact test (according to standards) should be included in acceptance inspections—cracks are a source of abnormal noise.
Stone impact tests should be based on speed: higher speed stone impacts are more severe. Test according to the actual vehicle speed—only when the speeds are aligned is the data reliable.
Stone impact tests need to be divided by area: the front impact zone and the weak edge zone. Different areas result in different types of damage — only by testing by area can coverage be ensured.
Impact testing and low temperature should be combined: rocks are more brittle in winter. Low-temperature impact combined testing—combined conditions are the real working conditions.
| Stone Impact Test | Condition | Through the line |
|---|
| Impact energy | According to the corresponding vehicle speed | No cracks |
| Low-temperature rock strike | -30℃ United | No breakage |
| Marginal area | Key target | No cracking |
| After salt spray | Test after 48 hours | No corrosion cracks |
Table 2 reading method: Four conditions of stone impact, covering the real working conditions of the chassis. If the stone impact does not occur, it is the source of abnormal noise.
| Material specifications | Requirement | Explanation |
|---|
| Low temperature shock | -30℃ pass | Does not crack in winter |
| weather-resistant | Xenon lamp 1000h | Neither crispy nor brittle |
| Salt spray resistant | 48h | Chassis must be tested |
| Resilience | Drop hammer pass | Stone Resistance Strike |
Table 3 reading: Four indicators aligned with chassis conditions. Chassis parts, toughness cannot be compromised.
Pebble high-speed impact and cracking are the sources of abnormal noise — stone impact resistance is measured according to the actual vehicle speed corresponding energy, and it is only approved if there are no cracks or perforations.
TPO has more stable impact rigidity, SEBS-based is cheaper but its toughness needs to be verified—on hardcore off-road vehicles, TPO or thicker material is preferred, while for household cars, SEBS-based is sufficient. Choose according to positioning.
There is a big difference between normal temperature impact and low temperature impact. Read the data according to the actual temperature — -30°C low temperature stone impact combined test, chassis parts are most brittle in winter.
For chassis skid plate suppliers, ask four questions: What system, what temperature for low temperature, what standard for stone impact, and whether changes will be notified. After asking these four questions, the details are clear — asking the right questions is more useful than negotiating prices.
When prototyping, simulate stone impacts on the chassis skid plate under full load once: with full load, the ground clearance is lower and stone impacts are more frequent. After the full-load scenario, the vehicle is more stable when empty — simulating the extremes is more comprehensive than only looking at empty load.
Winter road tests include stone impacts and salt spray, which are a double test for chassis components — only after passing road tests can mass production be assured. Fully loaded, the ground clearance is lower and stone impacts are more frequent, so fully loaded scenarios also need to be simulated.
Cologne Customer Case: Insufficient rebound, function not meeting standards, parameter adjustment causes excessive smell during acceptance
A auto parts factory in Wuxi had insufficient rebound in chassis guards and substandard functional part performance. Cologne assisted in adjusting the injection molding parameters (mold temperature/material temperature/holding pressure), and the odor level met customer acceptance standards. Once the parameter window was correct, the performance stabilized—both the process and the formulation need to be right.
Summary
For components like chassis skid plates, the earlier the operating conditions are fully specified, the less rework there will be in selection. Hand over stone impact and low temperatures to the supplier together; the effort lies before the selection.
