正牌副牌差价不小，用错了批次就崩。副牌不是次品，是没进正牌的门，先把定位分清。
差价不小用错就崩，副牌先定位
TPE 副牌料是“分级货”：正牌、副牌、水口、回料。结论先给：正牌副牌差多少，先看水口占比——水口，是副牌的标尺。
TPE副牌料最大的坑：水口料掺多了，熔指和硬度跟着飘——水口占比，是副牌的体检单。
副牌料是成本账：会看副牌，省的是真金白银。不会看，省的是事故——副牌，是采购的考题。
指标偏了不等于废，为什么有副牌
副牌料是生产中的次等级：指标偏了，不是废料。指标偏一点，性能差一截——副牌，是正牌的影子。
水口料是浇口流道：回收再用，性能打折。水口占比，决定性能——水口，是副牌的标尺。
回料是分子链断了：性能大降，看场合用。回料，是副牌的底线。
正牌、副牌、水口、回料，怎么分
正牌：全项达标，放心用。正牌是标准线——正牌，是采购的参照。
副牌：部分指标偏，看用途用。副牌是分级货——副牌，是成本的通道。
水口：回收料，性能打折。水口按占比用——水口，是性能的变量。
回料：分子链断，谨慎用。回料看场合——回料，是使用的红线。
四类料，一张表对照清楚
| 类别 | 来源 | 性能 | 用途 |
|---|
| 正牌 | 原厂 | 全项达标 | 全场景 |
| 副牌 | 原厂次等级 | 部分偏 | 低要求 |
| 水口 | 浇口回收 | 打折 | 掺混 |
| 回料 | 再生 | 大降 | 谨慎 |
表格读法：类别分来源，用途跟着走，水口比例那一栏先问清。
分级看用途，料才买对。
用对副牌不翻车，验收核这四项
| 项目 | 要求 | 判断 |
|---|
| 来源 | 可溯 | 达标 |
| 水口占比 | 写单 | 达标 |
| 物性 | 实测 | 达标 |
| 批次 | 锁定 | 达标 |
表格读法：副牌一项项核，成本看得见，水口占比写进验收单。
水口，是副牌的标尺。
副牌当正牌用，批次先翻车
坑一：副牌当正牌。水口比例不问就当正牌买，性能差一档——分级必核。
坑二：水口不核。性能飘——水口占比必核。
坑三：回料乱用。事故——回料看场合。
水口占比、指标、用途——买前问清
三问：什么来源、水口占比多少、什么用途。一验：实测物性验收——三问一验，供应商底细清楚。
水口验证要先行：先把水口掺比和熔指对一遍，再谈每吨报价——水口，是副牌的标尺。
留样要成习惯：每批留样，物性按批次复测。批次换料先对比再放量——批次稳，客诉少。
波动、掺假、掉级：对照一张表
| 现象 | 原因 | 对策 |
|---|
| 性能飘 | 水口掺多 | 降占比 |
| 开裂 | 回料多 | 换正牌 |
| 批次乱 | 来源混 | 锁来源 |
| 色差 | 批次漂 | 锁批次 |
| 客诉 | 分级不清 | 写清分级 |
副牌便宜三成，硬度漂移也大三成——省的钱正好够赔客诉。 低价副牌用错地方，差价还得连本吐回去。
副牌不是废，是原厂次等级，部分指标偏。 先看水口占比，占比写进验收单，再谈用在哪个件，别一上来就囤。
正牌全项达标、副牌部分偏、水口打折、回料大降。 按指标偏项选用途，别把副牌当正牌使，分级用错就是翻车。
水口是副牌的“标尺”，占比是答案。 掺水口多了硬度、强度都打折，分级管理写清用途，别混着用。
副牌物性对比正牌实测、来源批次可溯，低要求件用副牌省三成不翻车。 关键件还是正牌，分级不混，才省得踏实。
副牌料水口占比写进验收单，超约定值直接退回。水口料掺多了硬度漂±5A、强度打折，没有料号批次号的散装便宜货再低也别碰。
副牌料按指标偏项分级用，别把副牌当正牌使。外观件掺两成水口降本，受力密封件别碰副牌，分级用错一次翻车差价全赔回去。
掺水口多了硬度强度都打折，分级管理写清用途别混着用
。先看水口占比写进验收单再谈用在哪个件，低价副牌用错地方差价连本吐回去。
低价副牌用错地方差价还得连本吐回去
。先看水口感口占比占比写进验收单再谈用在哪个件别一上来就囤，按指标偏项选用途别把副牌当正牌使分级用错就是翻车。
科隆客户案例：硬度漂移手感飘，换体系过低温弯折
合肥一家改性料应用厂，TPE 副牌料硬度批次漂移，手感忽软忽硬。科隆配合换体系换牌号（SEBS 基换 TPV 基），硬度稳定，-40℃ 低温弯折一次通过。体系换了，批次问题从源头断——批次漂移，先看体系稳定性。
小结
TPE副牌料的选型，水口先核，分级再看，正牌副牌差多少先看水口占比，水口是标尺。
十几年，只做一件事：把尼龙改成能用的样子。
PA6、PA66 是基本盘，PA46、PA6T、PA9T 是耐高温的门槛，PA11、PA12 管水路和油路，尼龙合金补单一树脂给不了的平衡。改性热塑性弹性体、改性尼龙、改性 PPO、PPS 并行，还有各大化工巨头的尼龙树脂、副牌料、大包料现货。
同一块料，用错地方就是事故。所以先问件，再问料。
There is a significant price difference between the main brand and the sub-brand. Using the wrong batch can cause a collapse. The sub-brand is not a defective product; it just didn’t enter the main brand category. First, clarify the positioning.
The price difference is significant; using the wrong one will fail. The sub-brand should be positioned first.
TPE secondary-grade material is 'graded material': primary grade, secondary grade, runners, and recycled material. Here's the conclusion first: to see how much difference there is between primary and secondary grade, first look at the proportion of runners—runners are the benchmark for secondary grade.
The biggest pitfall of TPE secondary-grade material: too much gate material mixed in, causing melt flow index and hardness to fluctuate—the proportion of gate material is like a health check report for secondary-grade material.
Secondary label material is a cost account: knowing how to read the secondary label saves real money. Not knowing it saves accidents—secondary labels are the test questions for procurement.
A skewed metric doesn't mean it's useless; why have a secondary benchmark?
Secondary-grade materials are lower-tier products in production: the standards are off, but they are not waste. When the standards are slightly off, performance drops a bit—secondary-grade materials are the shadow of the main brand.
Sprue material is the gate runner: recycled and reused, with reduced performance. The proportion of sprue determines performance—the sprue is the benchmark for secondary brands.
Recycled material means the molecular chains are broken: performance drops significantly, use it depending on the situation. Recycled material is the baseline for sub-brands.
How to distinguish between authentic brands, counterfeit brands, scraps, and recycled materials
Authentic brand: Meets all standards, safe to use. The authentic brand is the standard line—the authentic brand serves as a reference for procurement.
Secondary brand: Some indicators are off, use according to purpose. Secondary brand is graded goods—secondary brand is a channel for cost.
Sprue: Recycled material, performance is discounted. The sprue is used according to its proportion—the sprue is a variable of performance.
Recycled material: molecular chains are broken, use with caution. Using recycled material depends on the situation—recycled material is a red line in use.
Four types of materials, clearly compared on one sheet
| Category | Source | Performance | Purpose |
|---|
| Authentic brand | Original factory | All items meet the standard | All-scenario |
| Side deck | Original Factory Secondary Grade | Partially biased | Low requirements |
| water outlet | Gate Recycling | Discount | blending |
| Return material | Regeneration | Great drop | Cautious |
How to read the table: categories are divided by source, follow the usage, and first clarify the proportion in the 'water mouth' column.
Classify according to use, and you'll buy the right material.
Use the right auxiliary card to avoid mishaps, check these four items for inspection
| Project | Requirement | Judgment |
|---|
| Source | traceable | Meet the standard |
| Water mouth proportion | Write an order | Meet the standard |
| Physical properties | Actual measurement | Meet the standard |
| Batch | Lock | Meet the standard |
Table reading method: check the subsidiary cards item by item, costs are visible, and the proportion of the water mouth is written into the acceptance form.
Shuikou is the standard for secondary brands.
Using the secondary card as the main card, the batch failed first
Pitfall 1: Treating a secondary card as a primary card. Buying it as if it were a primary card without checking the water ratio, with performance being one level lower — grading is a must.
Pit two: The water gate is not checked. Performance fluctuates — the water gate proportion must be checked.
Pitfall three: Misusing recycled materials. Accident—depends on the situation for using recycled materials.
Proportion of water outlets, indicators, uses — ask clearly before buying
Three questions: What is the source, what is the proportion of water content, and what is the use? One inspection: actual measured physical properties acceptance—three questions and one inspection, the supplier's details are clear.
Sprue verification should come first: first check the sprue blending ratio and fluidity index, then discuss the price per ton—sprue is the benchmark for the secondary brand.
Making sample retention a habit: retain samples for each batch, and re-test the physical properties by batch. Before switching materials between batches, compare them first before scaling up—the batch stability is maintained, and complaints are fewer.
Fluctuations, Adulteration, Downgrading: Compared in a Table
| Phenomenon | Reason | Countermeasure |
|---|
| Unstable performance | Too much water added | Reduce proportion |
| Cracking | More recycled material | Change to the official brand |
| Batch disorder | Mixed sources | Lock source |
| Color difference | batch bleaching | Lock batch |
| Customer complaint | Unclear grading | Write the classification clearly |
Counterfeit brands are 30% cheaper, and the hardness deviation is also 30% — the money saved is just enough to cover customer complaints. If low-priced counterfeit brands are used in the wrong place, the price difference will have to be paid back in full.
Secondary cards are not waste; they are factory-grade lower-tier, with some indicators being off. First, look at the proportion of defects, record the proportion on the acceptance form, and then discuss which part to use them for. Don’t start stockpiling right away.
The main brand fully meets the standards, the secondary brand is partially substandard, there are discounts on minor defects, and recycled material is significantly reduced. Choose the application according to the substandard indicators, don’t use the secondary brand as if it were the main brand, misusing the grading can lead to failure.
Water content is the 'scale' for sub-brands, and the proportion is the answer. Adding too much water content reduces hardness and strength, so record the用途 in graded management and don't mix them.
The physical properties of secondary-brand parts are comparable to those of genuine-brand parts and the source batch is traceable; using secondary-brand parts for low-requirement components can save about 30% without causing issues. For critical components, it's still the genuine brand, and do not mix grades, only then can you feel secure in saving costs.
The proportion of secondary mold gate material should be recorded on the acceptance sheet; if it exceeds the agreed value, it will be returned immediately. If too much gate material is mixed in, the hardness will fluctuate ±5A and the strength will be discounted. Do not touch loose, cheap materials without material numbers or batch numbers, no matter how low the price is.
Sub-standard materials are graded for use according to specific indicators; do not treat sub-standard materials as standard ones. For appearance parts, mixing in 20% sprue can reduce costs, but do not use sub-standard materials for stress-bearing sealing parts. If grading is used incorrectly even once, any price difference must be fully compensated.
If too much water is added, both hardness and strength are compromised. Classification management should clearly specify the uses to avoid mixing them.
. First, look at the proportion of water inlets and write it into the acceptance form before discussing which part it will be used on. If the low-cost sub-brand is used in the wrong place, the price difference will have to be returned in full.
If you use a low-priced sub-brand in the wrong place, you still have to return the price difference in full.
. First, look at the water mouthfeel proportion, record the proportion in the acceptance form, then discuss which part to use. Do not stockpile immediately. Choose the intended use according to the index deviations, and do not treat secondary labels as primary ones. Misusing them in grading will lead to failure.
Cologne client case: hardness drift causing inconsistent feel, switching system leads to too low temperature bending
A modified material application factory in Hefei experienced batch hardness drift in TPE secondary materials, with inconsistent feel, sometimes soft and sometimes hard. Cologne cooperated to change the system and switch grades (from SEBS-based to TPV-based), resulting in stable hardness and passing -40°C low-temperature bending on the first try. With the system changed, the batch issue is cut off from the source—the first thing to check for batch drift is the system's stability.
Summary
For the selection of TPE secondary grade materials, first check the sprue, then look at the grading. To see the difference between primary and secondary grades, first check the proportion of the sprue, as the sprue is the benchmark.
For more than ten years, I've been doing only one thing: turning nylon into something usable.
PA6 and PA66 are the basic materials, PA46, PA6T, and PA9T are the high-temperature threshold materials, PA11 and PA12 are for water and oil pipes, and nylon alloys make up for the balance that a single resin cannot provide. Modified thermoplastic elastomers, modified nylon, modified PPO, PPS are all used in parallel, along with major chemical companies' nylon resins, secondary brand materials, and bulk materials in stock.
Using the same material in the wrong place can cause accidents. So first ask about the part, then ask about the material.
