试产摔过了，量产两批货防摔差一截。防摔壳不连打三批，等于没试。
结论先摆：防摔壳，防摔批次绑一起
防摔壳是“宣传防摔的件”：标榜防摔，就要真防摔。材料要防摔好、批次稳、耐磨——结论先给：防摔壳用 TPU 是主流；软硬复合结构，TPE 加 TPU 复合优先。
防摔壳的最大坑：试产过了，量产还要看。试产样品好，量产批次飘——批次验证，就是台阶。
防摔壳是功能件：防摔是卖点，也是责任。材料选对，口碑才稳——功能件，别省料钱。
TPU凭啥稳：防摔强，批次还不飘
防摔壳用 TPU 的理由：防摔强、批次稳、耐磨、颜色可定制——四条合起来，适合防摔壳。
防摔是核心：四角缓冲。防摔测试（按高度）写进验收——防摔，就是命。
批次不能省：防摔等级随批次飘——三批数据，先查再下单。
三摔三温磨它：跌落、冬夏、磨损
跌落工况：不同高度跌落。防摔测试按高度分级验——四角裂，就是事故。
温度工况：冬天发脆。低温跌落测试（-20℃）——冬天场景，别漏。
磨损工况：天天磨。耐磨数据按实际使用验——磨亮，防摔就降。
TPU还是TPE：防摔壳上见高低
| 维度 | TPU | TPE |
|---|
| 防摔 | 强 | 中 |
| 低温 | 好 | 可做 |
| 耐磨 | 强 | 中 |
| 成本 | 中高 | 低 |
| 复合 | 好 | 好 |
| 批次 | 稳 | 稳 |
表格读法：TPU 防摔全面占优；TPE 便宜——主流防摔壳 TPU，复合结构 TPU+TPE。
按结构选：一体 TPU，复合软硬 TPU+TPE——结构不同，材料不同。
两个自欺：试产当量产、防摔造假
坑一：试产即量产。样品好不等于批次好，连打三批才见真章——批次稳，才敢放量。
坑二：防摔虚标。宣传防摔，实际四角裂——防摔按实测验收。
坑三：真假料混用。副牌料指标飘——真假辨别（批次、报告）不能省。
连打三批再放量：批次先锁
三问：防摔按什么高度、批次数据齐不齐、耐磨按什么方法。一验：连打三批实测——三问一验，供应商底细清楚。
批次验证要先行：连打三批，逐批对比。防摔等级、耐磨、外观一批一批摸——三批稳，才敢上量产。
留样要成习惯：每批留样，防摔耐磨按批次复测。批次换料先对比再放量——批次稳，客诉少。
试产过了不算过：连打三批说话
三批验证连打三批：防摔、耐磨、外观逐批测。批次硬度飘差超过±3A，手感就分层——三批稳，才敢上量产。
首批打基准：防摔等级、耐磨数据记基准。基准清楚，对比才有据——基准，就是起点。
第二批第三批对比：波动≤5% 才放行。波动超限，查根源——波动，就是警报。
三批数据存档：量产对比有据。数据存档，是批次管理的底账——存档，就是保险。
| 批次验证 | 项目 | 通过线 |
|---|
| 首批 | 基准数据 | 记基准 |
| 第二批 | 同上 | 波动≤5% |
| 第三批 | 同上 | 波动≤5% |
| 三批汇总 | 存档 | 连续稳定 |
表2读法：连打三批，逐批对比，任一批波动都要查原因。
| 材料指标 | 要求 | 说明 |
|---|
| 防摔 | 按高度 | 四角不裂 |
| 低温 | -20℃ 跌落 | 冬天不裂 |
| 耐磨 | 按使用 | 无磨亮 |
| 批次 | 三批稳定 | 量产保障 |
表3读法：四指标是防摔壳的体检表。一批好是运气，批批好才是材料。
防摔等级按高度写死，1 米、1.5 米分档验收。 冬天发脆，冻一晚再摔一次，低温抗冲是防摔壳的隐藏考点。
试产过了不代表量产稳，三批数据存档才上台阶。 首批打基准、第二批第三批对比，波动 ≤5% 才放行。
TPE 吸能好但偏软，TPU 硬挺但偏涩——同是防摔手感差一截。 按定位选，运动款 TPU、日常款 SEBS 基 TPE。
样壳装满沙袋摔三次看四角，冻一晚再补一摔。 冬夏两季都过，防摔数据随批走，摔裂一次宣传全打脸。
防摔壳是卖点也是责任，摔裂一次口碑就垮。 批次、低温、高度三关一起锁，批批好才是真材料。
防摔壳冬天要冻一晚再摔，低温发脆是隐形考点。 冻到零下再做跌落，脆裂一次宣传全打脸，运动款 SEBS 基偏软吸能更好。
科隆客户案例：异味被退货压仓，定制牌号良率98%
台州一家电子消费厂，防摔壳成品异味被下游退回，货压在仓库。科隆配合定制耐油/耐温专用牌号，异味消除，量产良率稳定在 98%。异味是配方问题，定制才根治——通用料扛不住，就定制。
小结
防摔壳的选型没有一步到位的魔法，但判据能让你少绕圈，功夫在选型之前。
总有人问：副牌料到底能不能用。
我们的回答一直没变——能用的地方很多，不能用的地方一处都不能碰。它和回料是两回事：一个是指标偏了，一个是分子链断了。
The trial production failed the drop test, and the first two batches of mass production shipments fell short in drop resistance. Not testing the drop-proof case on three consecutive batches is equivalent to not testing it at all.
Conclusion first: put the anti-drop cases and the anti-drop batches together
A shockproof case is a 'promoted shockproof item': if it advertises being shockproof, it must truly be shockproof. The materials should be good at resisting drops, have stable batches, and be wear-resistant — conclusion first: using TPU for shockproof cases is mainstream; for soft-hard composite structures, TPE combined with TPU is preferred.
The biggest pitfall of drop-proof cases: after trial production, mass production still needs to be seen. The trial production samples are good, but the mass production batches vary — batch validation is a step.
A shockproof case is a functional item: being drop-resistant is both a selling point and a responsibility. Choosing the right material ensures a solid reputation—it's a functional item, so don't skimp on material costs.
Why TPU is stable: strong against drops, and batches are consistent
Reasons for using TPU for protective cases: strong drop resistance, stable batches, wear resistance, customizable colors—together, these four make it suitable for protective cases.
Drop protection is key: cushioning at the four corners. Drop tests (by height) are written into acceptance—drop protection is life.
Batches cannot be skipped: Drop resistance level varies by batch — check three batches of data before placing an order.
Three falls and three temperatures grind it: dropping, winter and summer, wear
Drop conditions: dropping from different heights. Drop tests are graded according to height—cracks at the four corners are considered accidents.
Temperature conditions: brittle in winter. Low-temperature drop test (-20℃) — winter scenario, don't miss it.
Wear conditions: worn every day. Wear resistance data is verified according to actual use—polished, impact resistance decreases.
TPU or TPE: the differences show on drop-proof cases
| Dimension | TPU | TPE |
|---|
| Drop-resistant | Strong | middle |
| Low temperature | Good | Can do |
| Wear-resistant | Strong | middle |
| Cost | Medium-high | Low |
| Compound | Good | Good |
| Batch | Stable | Stable |
Table reading: TPU is fully superior in drop resistance; TPE is cheap — mainstream drop-resistant cases use TPU, composite structures use TPU and TPE.
Select by structure: integrated TPU, composite soft and hard TPU TPE—the structure is different, and the materials are different.
Two self-deceptions: treating trial production as mass production, faking drop resistance
Pitfall 1: Trial production is the same as mass production. Just because the sample is good doesn't mean the batch will be good. It takes producing three consecutive batches to see the real result—only when the batches are stable can you confidently ramp up production.
Pitfall 2: Misleading drop-resistance claims. Promoted as drop-resistant, but the corners actually crack—drop resistance should be verified by actual testing.
Pitfall Three: Mixing real and fake materials. The indicators of secondary brand materials fluctuate — the identification of authenticity (batch, report) cannot be skipped.
Strike three batches in a row before increasing volume: lock the batches first
Three questions: At what height should it be drop-tested, are the batch data complete, and what method should be used for abrasion resistance? One verification: Conduct real tests on three consecutive batches — three questions and one verification make the supplier's details clear.
Batch validation must come first: test three batches consecutively, comparing them batch by batch. Hand-check each batch for drop resistance, wear resistance, and appearance — only if all three batches are stable can mass production proceed.
Make sampling a habit: sample every batch, and retest drop resistance and wear resistance by batch. When changing materials for a batch, compare first before scaling up — stable batches mean fewer customer complaints.
Trial production doesn't count as passing: speak after three consecutive batches
Three batches of validation repeatedly tested in three batches: each batch is measured for drop resistance, wear resistance, and appearance. If the hardness variation between batches exceeds ±3A, the feel becomes layered—only when three batches are stable do we dare to go into mass production.
First batch sets the benchmark: Anti-drop level and wear resistance data are recorded as the benchmark. With a clear benchmark, comparisons are supported—the benchmark is the starting point.
Comparison between the second batch and the third batch: Only release if the fluctuation ≤ 5%. If the fluctuation exceeds the limit, investigate the source — fluctuation is an alarm.
Three batches of data archived: production comparison has evidence. Data archiving is the basic account for batch management—archiving is insurance.
| Batch verification | Project | Through line |
|---|
| first batch | Benchmark data | Record baseline |
| The second batch | Same as above | Fluctuation ≤5% |
| The third batch | Same as above | Fluctuation ≤5% |
| Summary of three batches | Archive | Continuous and stable |
Table 2 reading method: Run three batches consecutively, compare them batch by batch, and investigate the cause if there is fluctuation in any batch.
| Material indicators | Requirement | Explanation |
|---|
| Drop-resistant | By height | The four corners are intact |
| Low temperature | Fall at -20℃ | Does not crack in winter |
| Wear-resistant | According to use | Unpolished |
| Batch | Three Batches Stable | Mass production assurance |
Table 3 reading: The four indicators are the health check report of the drop-proof case. A batch being good is luck; every batch being good is the material.
The drop resistance level is fixed according to height, with acceptance divided into 1 meter and 1.5 meters. It becomes brittle in winter; after freezing overnight, dropping it again tests low-temperature impact resistance, which is a hidden evaluation point for drop-proof cases.
Passing the trial production does not mean mass production is stable; only after archiving data from three batches can progress be made. The first batch sets the benchmark, and the second and third batches are compared; only if the fluctuation is ≤5% will it be released.
TPE absorbs impact well but is on the soft side, while TPU is firm but a bit rough—though both are shockproof, the feel is quite different. Choose based on purpose: TPU for sports models, SEBS-based TPE for daily use.
Fill the sample shell with sandbags and drop it three times to check the four corners, then freeze it overnight and drop it once more. It goes through both winter and summer seasons, and the drop test data is batch-specific; if it cracks once, all the publicity is ruined.
A shockproof case is both a selling point and a responsibility; if it cracks from one drop, the reputation collapses. Batch, low temperature, and height are three checkpoints locked together; only consistently good batches are truly quality materials.
Drop-resistant cases should be left in the cold overnight before dropping them in winter; brittleness at low temperatures is a hidden test point. Dropping them after freezing below zero could cause cracking, which would completely contradict promotional claims. Sport-style SEBS is generally softer and absorbs impact better.
Cologne Customer Case: Odor Returned and Overstocked, Custom Grade Yield 98%
An electronic consumer goods factory in Taizhou had finished anti-drop cases returned by downstream clients due to odor, and the stock piled up in the warehouse. Cologne cooperated to customize oil-resistant/temperature-resistant special grades, eliminating the odor, with mass production yield stabilized at 98%. The odor is a formulation issue; only customization can solve it—instead of general materials that can't handle it, customize it.
Summary
There is no magic to choosing a shockproof case in one step, but criteria can help you take fewer detours; the effort lies before the selection.
There are always people asking: Can substandard materials actually be used?
Our answer has never changed — it can be used in many places, but any place where it can't be used must not be touched at all. It is different from recycled material: one has deviated indicators, the other has broken molecular chains.
