食品级 TPE 和硅胶的“认证差”：硅胶早有 FDA/LFGB 的传统地位，TPE 要靠 SEBS 基加助剂体系重做迁移数据。不是 TPE 不行，是认证门槛得重新过一遍。
食品级 TPE 和硅胶的“迁移差”：硅胶惰性高、析出少；TPE 含油和助剂，迁移控制全看配方。瓶盖、密封圈这类长期接触件，迁移数据比硬度更要紧。
食品级 TPE 和硅胶的“成本差”：硅胶要硫化、效率低；TPE 注塑分钟级，单件成本压得下来。要超软和高温蒸煮选硅胶，要效率和多彩成型选 TPE。
保鲜盒盖一进冰箱就析出，内壁蹭一层油。食品级TPE和硅胶，从来不是谁替代谁。
一句话结论：食品级 TPE 和硅胶，不是谁替代谁
食品级场景里，TPE 和硅胶经常同场竞争：奶嘴、密封圈、垫片、吸管、搅拌刀头——两个体系都能做，**结论先给：要高温蒸煮和超软手感，
硅胶占优；要成本、效率和多彩成型，食品级 TPE 赢**。
同场竞争的场景还在扩大：婴儿餐具、咖啡杯盖、保温杯密封圈、厨房小家电垫片——凡是“接触食品但不长时间高温”的件，
都是 TPE 的机会。
替不替得动，看温度，也看认证准备得早不早。
| 维度 | 食品级 TPE | 硅胶 |
|---|
| 单价 | 低 | 高（约 1.5-3 倍） |
| 成型效率 | 注塑/挤出，秒级成型 | 硫化，分钟级 |
| 耐温 | 多数 100-120℃ | 150-200℃ |
| 手感 | 可调软糯 | 天然柔软 |
| 认证 | FDA/LFGB/GB4806 可过 | 同样可过 |
| 回收 | 热塑性可回收 | 热固性难回收 |
技术金句：食品级 TPE 和硅胶的竞争，本质是“效率换成本”对“耐温换手感”——工况不超 100℃ 的件，TPE 往往更划算。
判据一 · 认证：三大标准，各管一摊
认证分层按市场取用：出口欧盟的件，很多客户指定 LFGB；出口美国看 FDA；只做内销看 GB 4806。
三个体系不是互相替代，是按市场取用——做多市场出口的，认证要按“交集+补测”规划，别等清关时补。
食品级 TPE 的认证，先分清三大体系：
- 中国 GB 4806：国标体系，迁移总量、特定迁移、高锰酸钾消耗量等，出口内销都要看；
- 美国 FDA 21 CFR：按接触食品类型分类（177.2600 等条款），关注组分和迁移；
- 欧盟 LFGB：德国标准，比一般欧盟框架更严，感官（气味/味道）测试是特色。
很多工厂只认“食品级”三个字，不看具体标准——做奶嘴的、做吸管的、做密封垫的，接触的食品不同、温度不同，对应条款完全不同。
选料时把“接触什么食品、多少度、多长时间”报给供应商，供应商才能按对应条款提供报告。
证书核验还有“官方渠道”的门道：检测报告的编号，可以上机构官网或国家认监委系统查真伪。
要求供应商把报告编号写进报价单，采购自己上网核一遍——这一步能筛掉一半拿过期报告、假报告撑门面的报价。
判据二 · 迁移和析出：两个隐形杀手
食品级 TPE 的合规，一半看迁移，一半看析出：
- 总迁移量：材料向食品模拟物中转移的总量，国标有上限；
- 特定迁移：某一特定物质（如矿物油、抗氧剂、增塑剂）的迁移量，单独设限；
- 析出（渗出）：小分子助剂在表面析出，轻则发白发粘，重则影响口感和卫生。
析出这件事，和配方里的油、助剂用量直接相关——SEBS 基 TPE 充油比例高，油品选择和处理不好，析出就压不住。
所以食品级 TPE 的选型，要看三样：油的等级（食品级白油）、抗氧剂/光稳定剂的选择、以及成品的迁移和析出实测报告。
析出还分“表面析出”和“接触析出”：表面析出是发白、发粘，看得见；接触析出是迁移到食品里，看不见。
食品级 TPE 的验收，两项都要测——只看表面的，等于放走了最危险的隐患。
食品级件还有个“重复使用”的验证：一次性件和可重复使用件，迁移测试的循环次数不同。
奶嘴、保温杯垫要反复清洗、反复接触食品——选料时把“使用次数”写进工况，报告才贴合真实使用。
迁移测试要用对模拟物：油脂类食品用油性模拟液，水性食品用水性模拟液——同一种材料，
测油和测水的迁移量可能差出好几倍。
选料时把实际接触的食品类型写清楚，报告才对得上。
食品级件的“接触面积”也影响迁移：同样材料，表面积大、接触食品多，迁移总量就高。
薄壁件、异形件要做实际件测试——粒料测的数据，和实际件的迁移量可能有量级差。
判据三 · 手感和工艺：食品级的性价比
食品级 TPE 的性价比，来自三个地方：
性价比还要算“开发周期”：硅胶开模慢、硫化调试慢，TPE 注塑模具快、调试快——新品上市节奏，TPE 能快一个月到一季度。
对快消食品包装件，上市窗口就是利润窗口。
食品级 TPE 的“水口回用”比例要控制：回料比例过高，物性下降、迁移风险上升。
食品级项目建议回料比例固定并做验证——回料不是不能用，是得管着用。
- 1. 效率：注塑循环秒级，硅胶硫化按分钟算——量大的件，效率差就是成本差；
- 2. 多彩：TPE 可以预着色、免喷涂，硅胶配色相对受限；
- 3. 回收：TPE 是热塑性，水口、飞边可回收利用，损耗率低。
但也要认账：超软件（Shore 0-20A）、长期高温件、需要蒸煮消毒的件，硅胶依然有优势。
食品级 TPE 的软度靠充油和配方调节，太软会牺牲回弹和抗撕，所以“能多软”和“能多耐用”要一起谈。
三个问题定体系：认证、迁移、手感
食品级 TPE 的“仓储”也有讲究：材料要避光、防潮、远离异味源存放。
TPE 吸潮后注塑有气泡、外观缺陷；吸附异味后件有怪味——仓库管理不写进 SOP，前面选料全白费。
- 1. 问温度：使用温度超 120℃ 或要蒸煮 → 硅胶优先；100℃ 以内 → TPE 可谈；
- 2. 问手感：要极软亲肤 → 硅胶；软糯但要有回弹 → TPE；
- 3. 问量：年用量大、要效率 → TPE 赢面大；小批量高附加值 → 硅胶不心疼。
| 认证 | 地区 | 要求 |
|---|
| FDA | 美国 | 食品接触 |
| LFGB | 德国 | 食品接触 |
| GB4806 | 中国 | 食品接触 |
| 验收项 | 要求 | 判断 |
|---|
| 认证 | 对应市场 | 达标 |
| 迁移 | 实测 | 达标 |
| 气味 | 等级 | 达标 |
| 批次 | 可溯 | 达标 |
科隆客户案例：低温开裂整批报废，留样数据救回批次
温州一家改性料应用厂，食品级 TPE 件在冬季低温下开裂，整批报废。科隆配合提供同批次留样与物性数据，逐项核对低温弯折、迁移指标，批次合格率回到 98% 以上。
留样和物性数据，是“批批能追溯”的底气——出争议时，数据比口头承诺管用。
小结
食品级件的“试产验证”要完整：模具、温度、周期定型后，试产批做全项检测——迁移、感官、尺寸、外观。试产验证不过的，别急着量产；过了的，把参数锁进工艺卡。
食品级 TPE 的“市场门槛”在升高：电商平台对食品接触类目查证越来越严，买家晒证、差评都看证书。材料证书齐不齐，直接决定你能不能上架——证书不是成本，是入场券。
食品级 TPE 的“配方保密”和“追溯”要平衡：食品级配方涉及认证，供应商一般不公开全部组分，但要能提供“成分声明”和“合规评估”。采购要的是可追溯，不是配方本身——这两件事分清，合作才顺畅。
食品级 TPE 和硅胶，先问温度、再问手感、最后算量——三问过完，方向基本就定了。
食品级件的坑，多数不在材料贵不贵，在选型时有没有问对问题，我们下篇接着聊。
食品级 TPE 的供应商选择，看三样：证书齐全度、留样习惯、变更管理。这三样过关的供应商，出问题的概率低一个量级——选供应商，比选牌号更花时间，也更值钱。
The "certification gap" between food-grade TPE and silicone: Silicone has long held a traditional status with FDA/LFGB certification, while TPE needs to redo migration data based on SEBS with additives. It's not that TPE is incapable, but the certification threshold has to be cleared again.
The 'migration difference' between food-grade TPE and silicone: silicone is highly inert and has little leaching; TPE contains oils and additives, and migration control depends entirely on the formulation. For long-term contact parts such as bottle caps and seals, migration data is more important than hardness.
The 'cost difference' between food-grade TPE and silicone: silicone requires vulcanization, which is inefficient; TPE can be injection molded in minutes, allowing the unit cost to be reduced. Choose silicone for ultra-softness and high-temperature steaming, and choose TPE for efficiency and colorful molding.
As soon as the lid of the food storage container enters the fridge, it exudes and leaves a layer of oil on the inner wall. Food-grade TPE and silicone have never been substitutes for each other.
One-sentence conclusion: Food-grade TPE and silicone are not replacing each other.
In food-grade applications, TPE and silicone often compete in the same scenarios: pacifiers, sealing rings, gaskets, straws, mixing blades — both systems can be used. **Conclusion first: for high-temperature steaming and ultra-soft feel,
Silicone dominates; for cost, efficiency, and colorful molding, food-grade TPE wins.
The scenarios of competition are still expanding: baby tableware, coffee cup lids, insulated cup seals, kitchen appliance gaskets—basically any part 'that comes into contact with food but not at high temperatures for long periods'.
It's all TPE's opportunity.
Whether it can be replaced or not depends on the temperature, and also on whether the certification preparations were done early.
| Dimension | Food-grade TPE | Silicone |
|---|
| Unit price | Low | High (approximately 1.5-3 times) |
| Molding efficiency | Injection molding/extrusion, second-level molding | Vulcanization, minute-level |
| Temperature resistant | Most 100-120℃ | 150-200℃ |
| hand feel | Adjustably soft and glutinous | Natural softness |
| Certification | FDA/LFGB/GB4806 compliant | Can also pass |
| Recycle | Thermoplastic recyclable | Thermoset is difficult to recycle |
Tech Catchphrase: The competition between food-grade TPE and silicone is essentially 'efficiency for cost' versus 'temperature resistance for feel' — for parts operating under 100℃, TPE is often more cost-effective.
Criterion One · Certification: Three Major Standards, Each Handles Its Own Area
Certification is layered according to market usage: for items exported to the EU, many customers specify LFGB; for exports to the USA, check FDA; for domestic sales only, refer to GB 4806.
The three systems are not mutually substitutable; they are used according to the market—those exporting to multiple markets should plan certification according to 'intersection and supplementary testing,' and not wait to make up tests at customs clearance.
Certification of food-grade TPE begins with distinguishing the three major systems:
- China GB 4806: National standard system, total migration, specific migration, potassium permanganate consumption, etc., need to be considered for both export and domestic sales;
- U.S. FDA 21 CFR: Classified according to the type of food contacted (sections 177.2600, etc.), focusing on components and migration;
- EU LFGB: German standard, stricter than the general EU framework, with sensory (smell/taste) testing as a feature.
Many factories only recognize the three words 'food grade' and do not look at the specific standards—whether making pacifiers, straws, or sealing gaskets, the food they come into contact with and the temperatures are different, and the corresponding provisions are completely different.
When selecting materials, report to the supplier 'what food it will come into contact with, at what temperature, and for how long,' so that the supplier can provide a report according to the corresponding terms.
There is also an 'official channel' for certificate verification: the number on the test report can be checked for authenticity on the institution's official website or the National Certification and Accreditation Administration system.
It is required that suppliers write the report number on the quotation, and the purchaser should check it online themselves — this step can screen out half of the quotations that are propped up with expired or fake reports.
Criterion Two · Migration and Precipitation: Two Invisible Killers
The compliance of food-grade TPE depends half on migration and half on extraction:
- Total migration: the total amount of material transferred into food simulants, with a limit set by national standards;
- Specific migration: the migration amount of a certain specific substance (such as mineral oil, antioxidants, plasticizers) is set with a separate limit;
- Precipitation (exudation): Small molecule additives precipitate on the surface, causing whitening and stickiness in mild cases, and affecting taste and hygiene in severe cases.
The issue of exudation is directly related to the amount of oil and additives in the formulation—if the SEBS-based TPE has a high oil content, and the choice and treatment of the oil are not good, the exudation cannot be suppressed.
So, when selecting food-grade TPE, three things need to be considered: the grade of oil (food-grade white oil), the choice of antioxidants/light stabilizers, and the tested reports of migration and leaching in the final product.
Precipitation is further divided into 'surface precipitation' and 'contact precipitation': surface precipitation is whitish, sticky, and visible; contact precipitation migrates into food and is invisible.
For the acceptance of food-grade TPE, both tests must be conducted—just looking at the surface is equivalent to letting the most dangerous hidden risks go.
Food-grade items also have a "reuse" verification: disposable items and reusable items have different numbers of cycles for migration testing.
Pacifiers and thermos cup mats need to be washed repeatedly and repeatedly come into contact with food—when selecting materials, writing 'number of uses' into the working conditions makes the report reflect actual usage.
Migration testing should use the corresponding simulant: oily simulant for fatty foods, aqueous simulant for watery foods — the same type of material.
The migration amounts of oil testing and water testing may differ by several times.
When selecting materials, clearly specify the types of food that will actually come into contact, so that the report is accurate.
The 'contact area' of food-grade parts also affects migration: for the same material, the larger the surface area and the more it contacts the food, the higher the total migration.
Thin-walled parts and special-shaped parts need to undergo actual part testing—the data measured from granular material may differ in magnitude from the displacement of the actual parts.
Criterion Three · Feel and Craftsmanship: Cost-Effectiveness at Food Grade
The cost-effectiveness of food-grade TPE comes from three aspects:
Cost-effectiveness should also consider the 'development cycle': silicone molds are slow to open and vulcanization debugging is slow, whereas TPE injection molds are fast to make and quick to debug — for the pace of new product launches, TPE can be faster by one month to a quarter.
For fast-moving consumer goods packaging, the market launch window is the profit window.
The 'sprue recycling' ratio of food-grade TPE needs to be controlled: if the recycled material ratio is too high, physical properties will decline and the risk of migration will increase.
For food-grade projects, it is recommended that the return material ratio be fixed and verified—return material is not unusable, it just needs to be controlled when used.
- 1. Efficiency: Injection molding cycles are measured in seconds, while silicone vulcanization is measured in minutes— for large quantities, poor efficiency means higher costs.
- 2. Colorful: TPE can be pre-colored, no spraying required, while silicone coloring is relatively limited;
- 3. Recycling: TPE is thermoplastic, and sprues and flash can be recycled, with a low loss rate.
But we also have to acknowledge: for ultra-software (Shore 0-20A), long-term high-temperature components, and parts that need to be steamed and sterilized, silicone still has an advantage.
The softness of food-grade TPE is adjusted through oil filling and formulation; if it is too soft, it will sacrifice resilience and tear resistance, so 'how soft it can be' and 'how durable it can be' need to be considered together.
Three questions determine the system: certification, migration, and feel
There are also specific requirements for the 'storage' of food-grade TPE: the material should be kept away from light and moisture, and stored away from sources of odors.
After TPE absorbs moisture, injection molding results in bubbles and appearance defects; after absorbing odors, the parts have a strange smell—if warehouse management is not included in the SOP, all the previous material selection is wasted.
- 1. Asking about temperature: if the temperature exceeds 120℃ or needs to be boiled → prefer silicone; if within 100℃ → TPE is negotiable;
- 2. Ask about the feel: extremely soft and skin-friendly → silicone; soft and sticky but needs to be resilient → TPE;
- 3. Consider the quantity: For large annual usage and the need for efficiency → TPE has a big advantage; for small batch, high added value → silicone is not worrisome.
| Certification | Region | Requirement |
|---|
| FDA | United States | Food contact |
| LFGB | Germany | Food contact |
| GB4806 | China | Food contact |
| Acceptance items | Requirement | Judgment |
|---|
| Certification | corresponding market | Meet the standard |
| Migration | Actual measurement | Meet the standard |
| smell | Level | Meet the standard |
| Batch | traceable | Meet the standard |
Cologne Customer Case: Entire Batch Scrapped Due to Low-Temperature Cracking, Sample Data Saved the Batch
A modified material application factory in Wenzhou experienced cracking of food-grade TPE parts at low temperatures in winter, resulting in an entire batch being scrapped. Kolon cooperated by providing samples and physical property data of the same batch, checking low-temperature bending and migration indicators item by item, and the batch pass rate returned to over 98%.
Sample retention and physical property data are the confidence behind 'every batch traceable'—when disputes arise, data is more reliable than verbal promises.
Summary
The 'trial production verification' of food-grade parts must be complete: after the mold, temperature, and cycle are set, perform full inspections on the trial production batch — migration, sensory, dimensions, appearance. If the trial production verification fails, do not rush into mass production; if it passes, lock the parameters into the process card.
The 'market threshold' for food-grade TPE is rising: e-commerce platforms are becoming stricter in verifying food contact categories, and buyers check certificates when posting reviews or complaints. Whether the material certificates are complete directly determines if you can list your products—certificates are not a cost, they are a ticket to entry.
The 'formula confidentiality' and 'traceability' of food-grade TPE need to be balanced: food-grade formulas involve certification, and suppliers generally do not disclose all components, but they must be able to provide 'ingredient declarations' and 'compliance assessments.' What procurement needs is traceability, not the formula itself—distinguishing between these two ensures smooth cooperation.
Food-grade TPE and silicone, first ask about the temperature, then about the feel, and finally calculate the quantity—after these three questions are done, the direction is basically set.
The pitfalls of food-grade components mostly do not lie in whether the material is expensive, but in whether the right questions were asked during the selection process. We will continue discussing this in the next article.
When choosing a supplier for food-grade TPE, look at three things: completeness of certificates, sample retention practices, and change management. Suppliers who pass these three criteria have a probability of problems an order of magnitude lower—selecting a supplier takes more time and is more valuable than selecting a grade.
