冬天一搬就脆裂，客户以为料掺了假。耐温等级没选够，低温就是照妖镜。
一搬就裂，不是掺假是耐低温不够
TPE 开裂脆裂，等级和批次是两条线：耐温、批次、配方。结论先给：冬天一掰就裂，多半是耐温没跟上——等级，是开裂的头一线索。
TPE开裂最大的坑：脆裂先查耐温等级，先看批次。等级不够，脆裂跑不了——等级，是开裂的底线。
TPE 开裂是品质关：脆裂、开裂都是问题。等级对了，品质才稳——品质关，别省配方。
耐温不够就变脆，为什么先核等级
TPE 耐温分等级：SEBS 基 70-100℃，TPV 130℃。等级不够，低温就脆——耐温等级，是开裂的底线。
脆裂看低温：低温冲击测试，弯折不过就脆。低温测试写进验收——低温，是脆裂的考场。
开裂看应力：应力集中处先裂。设计注意，应力分散——应力，是开裂的导火索。
来源、稳定性、追溯，批次怎么查
批次来源：正牌副牌分开管。来源混了，性能漂——来源，是批次的身份证。
批次稳定：同一牌号多批对比。批间波动大，换批就出事——稳定性，是批次的底线。
批次追溯：留样登记批次号。出问题，先查批次——追溯，是批次的账本。
耐温等级，一张表对照清楚
| 体系 | 连续耐温 | 用途 |
|---|
| SEBS基 | 70-100℃ | 通用 |
| TPV | 130℃ | 耐油 |
| TPU | 80-120℃ | 耐磨 |
| TPEE | 150℃ | 高温 |
表格读法：耐温等级对着使用温度选，低了就脆——开裂件先问工况温度，再回头对批次。
等级选对，脆裂不来。
低温不裂不开，验收测这四项
| 项目 | 检查 | 判断 |
|---|
| 等级 | 达标 | 核验 |
| 批次 | 锁定 | 核验 |
| 低温 | 测试 | 核验 |
| 应力 | 设计 | 核验 |
表格读法：脆裂位置、断面、使用温度逐项记——温度不够硬撑，脆裂跑不了。
等级，是开裂的头一线索。
脆了先怪料，等级批次没人核
坑一：先怪料。一裂就换料，耐温等级和批次还没核——脆裂从工况温度和批次两头查。
坑二：低温不测。脆裂——低温测试必做。
坑三：来源不核。批次漂——来源必查。
耐温、批次、追溯——定料前问清
三问：什么体系、什么低温、什么应力。一验：实际工况实测——三问一验，供应商底细清楚。
等级验证要先行：按使用温度定耐温档，再核当前批次。先核等级，再谈配方——等级，是开裂的底线。
留样要成习惯：每批留样，耐温按批次复测。批次换料先对比再放量——批次稳，客诉少。
脆裂、发白、掉渣：故障对照一张表
| 现象 | 原因 | 对策 |
|---|
| 脆裂 | 等级低 | 换耐温料 |
| 开裂 | 应力集中 | 改设计 |
| 开裂 | 批次漂 | 锁批次 |
| 脆裂 | 低温 | 换低温料 |
| 开裂 | 老化 | 换耐候料 |
冬天户外件一弯就脆裂，客户说料不行——多半是耐温等级没压到低温档。 SEBS基连续耐温70-100℃，北方冬用件要补低温冲击数据，弯折不开裂才算过。
脆裂先别怪料，先看应力集中。 分型面、尖角、浇口这些地方先裂，圆角加大过渡，开裂概率先降一半。
耐温档按体系分：SEBS 70-100℃、TPV 130℃、TPEE 150℃。 按工况上限选，别按价格选，高温件错用SEBS就是脆裂的开始。
开裂是TPE的“感冒”，应力和温度是两个受凉点。 留样每批复测耐温和低温弯折，换批先对比再放量，客诉从源头断。
低温弯折-30℃不开裂、批次硬度波动收进±3A，脆裂客诉能压到零。 验收就按这两条核，别信口头“耐低温”三个字。
开裂件先别换料，把分型面和浇口的应力集中点列出来。尖角、厚薄交界、熔接线是开裂高发区，R角加大到料厚一半，开裂概率先降一截。
低温脆裂看体系不看牌号，SEBS基-30℃、TPV基-40℃是两档。北方户外件按-30℃弯折不开裂验收，薄件要叠6mm试片测Shore，厚度不够读数偏软5度。
开裂件留样每批复测低温弯折，换批先对比再放量。-30℃弯折不开裂、批次Shore波动收进±3A，脆裂客诉从源头断，别信口头耐低温三个字。
耐温档按体系分：SEBS 70-100℃、TPV 130℃、TPEE 150℃。按工况上限选别按价格选，高温件错用SEBS就是脆裂的开始，批次换料先对比再放量。
验收就按低温弯折-30℃不开裂加批次硬度±3A两条核。别信口头耐低温三个字，脆裂客诉从源头断，换批先对比再放量。
科隆客户案例：耐磨不合格磨花快，匹配基材返工降半
苏州一家注塑加工厂，TPE 件耐磨不合格，表面磨花快。科隆配合重新匹配包胶基材与加工温度，耐磨提升，返工率降了一半。基材匹配对了，耐磨从配方提——耐磨问题，先看基材体系。
小结
TPE开裂的处理，等级先核，批次再查，脆裂先查耐温等级先看批次，等级是底线。
It cracks as soon as you move it in winter, and customers think the material has been adulterated. The temperature resistance grade wasn't chosen high enough; the low temperature acts like a revealing mirror.
It cracks as soon as it’s moved; it’s not adulterated, it just can’t withstand low temperatures.
TPE cracks and becomes brittle, and grade and batch are two separate lines: temperature resistance, batch, formulation. Here's the conclusion first: if it breaks easily in winter, it is most likely due to insufficient temperature resistance—the grade is the first clue to cracking.
The biggest pitfall in TPE cracking: When it cracks brittly, first check the temperature resistance grade, then check the batch. If the grade is not enough, brittleness is unavoidable—the grade is the baseline for cracking.
TPE cracking is a quality issue: brittleness and cracking are both problems. Only with the right grade can quality be stable—quality is key, don’t skimp on the formula.
If the temperature resistance is insufficient, it becomes brittle. Why prioritize the core grade first?
TPE temperature resistance grades: SEBS base 70-100°C, TPV 130°C. If the grade is insufficient, it becomes brittle at low temperatures—the temperature resistance grade is the baseline for cracking.
Brittleness seen at low temperatures: low-temperature impact test, if it doesn't bend, it breaks. Low-temperature testing is written into acceptance — low temperature is the examination ground for brittleness.
Check cracks by stress: cracks appear first at stress concentration points. In design, pay attention to stress dispersion—stress is the fuse for cracking.
Source, stability, traceability, how to check the batch
Batch source: main and secondary brands are managed separately. If sources are mixed, performance fluctuates——the source is the batch's ID.
Batch stability: Comparison across multiple batches of the same grade. Large fluctuations between batches can cause problems when switching batches—stability is the baseline for batches.
Batch traceability: Record the batch number of the sample. If there is a problem, check the batch first—traceability is the ledger of the batch.
Temperature resistance rating, clearly compared in one table
| system | Continuous temperature resistance | Purpose |
|---|
| SEBS-based | 70-100℃ | General |
| TPV | 130℃ | Oil-resistant |
| TPU | 80-120℃ | Wear-resistant |
| TPEE | 150℃ | High temperature |
Reading the table: Match the temperature resistance grade with the operating temperature; if it's too low, it will become brittle— for cracked parts, first check the working temperature, then go back to check the batch.
Choose the right grade, and it won't crack.
Doesn't crack in low temperatures, test these four items for acceptance
| Project | Check | Judgment |
|---|
| Level | Meet the standard | Verification |
| Batch | Lock | Verification |
| Low temperature | Test | Verification |
| Stress | Design | Verification |
Table reading method: Record each item—brittle fracture location, cross-section, and operating temperature—temperature too low makes it hard to support, brittle fracture won't occur.
Grade is the first clue of cracking.
When it breaks, first blame the materials; no one checks the grade or batch.
Pitfall 1: Blaming the material first. As soon as it cracks, the material is replaced, but the temperature resistance rating and batch haven't been verified yet — check brittle cracking from both operating temperature and batch.
Pitfall 2: Not testing for low temperatures. Brittle cracking — low-temperature testing is a must.
Pitfall three: Source not verified. Batch drift—source must be checked.
Temperature resistance, batch, traceability — ask clearly before confirming the material
Three questions: what system, what low temperature, what stress. One verification: actual operating conditions measured — three questions and one verification, the supplier's details are clear.
Level verification comes first: determine the temperature resistance grade based on the operating temperature, then check the current batch. First verify the grade, then discuss the formula—the grade is the baseline for cracking.
Making sample retention a habit: retain samples for each batch, and re-test temperature resistance batch by batch. Before switching materials between batches, compare them first before scaling up—the batches are stable, and customer complaints are few.
Brittle, whitening, crumbling: a table of fault comparisons
| Phenomenon | Reason | Countermeasure |
|---|
| Brittle and cracked | Low level | Change to heat-resistant material |
| Cracking | Stress concentration | Redesign |
| Cracking | Batch bleaching | Lock batch |
| Brittle and cracked | Low temperature | Switch to low-temperature material |
| Cracking | Aging | Replace with weather-resistant material |
Outdoor parts become brittle and crack with a bend in winter. Customers say the material is not good—most likely the temperature resistance grade did not reach the low-temperature level. SEBS-based materials have a continuous temperature resistance of 70-100°C. For winter parts in the north, low-temperature impact data need to be supplemented; bending without cracking is considered passing.
Don't blame the material for brittleness first; check stress concentration first. Parting surfaces, sharp corners, and gates are the first places to crack. Increasing the radius of corners and smoothing transitions can reduce the probability of cracking by half.
Temperature resistance categories by system: SEBS 70-100°C, TPV 130°C, TPEE 150°C. Choose based on the upper limit of the working conditions, not the price. Using SEBS for high-temperature parts is the beginning of cracking.
Cracking is TPE's 'cold,' with stress and temperature being two points of vulnerability. For each batch, samples are retested for heat resistance and low-temperature bending; before changing batches, compare first before scaling up, preventing customer complaints from the source.
Low-temperature bending - does not crack at -30°C, batch hardness fluctuation controlled within ±3A, complaints about brittleness can be reduced to zero. Acceptance should be based on these two criteria, don’t trust the verbal claim of 'low-temperature resistance'.
Don't change the material for the cracked part yet. First, list the stress concentration points on the parting surface and the gate. Sharp corners, thickness transitions, and weld lines are high-risk areas for cracking. Increase the radius R to half the material thickness to temporarily reduce the probability of cracking.
Low-temperature brittleness depends on the system, not the grade. SEBS-based is -30°C, TPV-based is -40°C. Outdoor parts in the north are accepted if they do not crack when bent at -30°C. Thin parts need to stack 6mm test pieces to measure the Shore hardness, and if the thickness is insufficient, the reading will be 5 degrees softer.
For cracked parts, keep samples from each batch for re-testing of low-temperature bending. For a new batch, compare first before ramping up production. Bending at -30°C should not cause cracking, and batch-to-batch Shore hardness fluctuations should be within ±3A. Complaints about brittle cracking should be stopped at the source; don't trust the words 'low-temperature resistance' casually.
Temperature resistance grades are divided by system: SEBS 70-100℃, TPV 130℃, TPEE 150℃. Choose according to the upper limit of operating conditions and price. Using SEBS for high-temperature parts is the beginning of brittleness. When changing batches of materials, compare first before increasing the quantity.
Acceptance should be based on low-temperature bending at -30°C without cracking, plus batch hardness ±3A as two criteria. Don't trust the mere words 'low-temperature resistance'; cracking complaints should be stopped at the source. When switching batches, compare first before increasing the volume.
Cologne Customer Case: Wear resistance failed, scratching occurs quickly, rework on matching substrate halved
An injection molding factory in Suzhou had TPE parts that were not wear-resistant, and the surface scratched quickly. With cooperation from Cologne, the coating substrate and processing temperature were re-matched, improving wear resistance and halving the rework rate. When the substrate matching is correct, wear resistance can be enhanced from the formulation—when facing wear resistance issues, first look at the substrate system.
Summary
Handling TPE cracking: first check the grade, then check the batch. For brittle cracking, first check the temperature resistance grade, then look at the batch. Grade is the baseline.
