充电壳过不了V0，整批货卡在安规认证出不了货。阻燃TPE，含卤无卤没拎清就别下单。
先给结论：V0 是及格线，无卤是加分项
阻燃 TPE，用在充电桩线缆、电源线、电子外壳、电池包密封件上——结论一句话：UL94 V0 是及格线，无卤是加分项，卤素阻燃和无卤阻燃是两条路线。
很多采购把“V0”当终点——V0 只是安全底线，越来越多的行业（尤其新能源、出口电子）要求无卤。V0 和无卤，不是一回事。
阻燃等级这条线跟着壁厚走：同一牌号，0.8mm 和 1.6mm 的壁厚，UL94 等级可能不同——越薄越难达标。
所以阻燃 TPE 选型，要把“实际壁厚”写进工况，按实际厚度测等级。只信厚壁报告的，薄壁件量产后掉级是常事。
| UL94 等级 | 要求 | 适用 |
|---|
| V2 | 30s 自熄 | 一般 |
| V1 | 30s 自熄 | 电子 |
| V0 | 10s 自熄 | 电源护套 |
| VW-1 | 线缆级 | 线缆 |
为什么是 TPE：阻燃的三个层次
层次一 · 阻燃等级：UL94 V0 / V1 / V2——V0 要求最高，10 秒内自熄。等级不够，安全线就破了。
标准差异先对齐市场：UL94 是美国体系，国内有 GB，出口欧洲走 EN/IEC——市场不同，测试方法就不同。
做出口件的，把“目标市场标准”列清楚，别拿一张 UL94 报告走天下。标准对不上，认证就白做。
灼热丝这条别漏：家电、电工产品的塑料件，常要过灼热丝测试（IEC 60695 等）——灼热丝和 UL94 是两套体系，过了 V0 不等于灼热丝合格。
做家电件的，把“灼热丝”一起列进要求。
层次二 · 卤素 vs 无卤：**含卤阻燃（溴系等）阻燃效率高但燃烧产生腐蚀性气体；
无卤阻燃（磷氮系）燃烧低烟低腐蚀**——新能源、轨道交通、出口电子，无卤是硬要求。
层次三 · 阻燃与物性的平衡：阻燃剂加多了，柔软度、强度、耐温都掉——“V0 + 柔软 + 无卤”三样全要，是配方功夫。
便宜阻燃料的坑在隐性成本里：要么阻燃剂填充多、物性差，要么等级虚标——省下的料钱，最后都从客诉里赔回去。
选阻燃料，价格要问，数据更要验。
量产后的日常抽检要跟上：按批次查阻燃等级，不用每批送第三方——厂内简易抽检（自熄时间、燃烧长度）就能快速判断。
日常抽检管批次波动，第三方复测管争议，两层保险才稳。抽检数据攒够三个月，批次波动曲线一眼就能看明白。
阻燃和物性的平衡，行业里有个“三角”说法：阻燃、柔软、耐温，三项最多同时保住两项——要 V0+柔软，耐温可能妥协；要 V0+耐温，
柔软可能妥协。
所以选型时把“三项的优先级”排好，供应商才知道往哪个方向调配方。
技术金句：阻燃 TPE 的选型，先定等级（V0/V1/V2），再定路线（卤/无卤），最后对平衡（柔软耐温）。
阻燃工况：灼热丝、氧指数、烟密度、卤系
| 工况项 | 问什么 | 影响什么 |
|---|
| 什么应用 | 线缆/外壳/密封件 | 等级和路线 |
| 什么标准 | UL94/UL1581/VW-1 | 测试方法不同 |
| 卤素要求 | 无卤还是含卤 | 燃烧产物要求 |
| 什么物性 | 硬度、耐温、强度 | 配方平衡点 |
对比表：含卤 vs 无卤阻燃 TPE
| 维度 | 含卤阻燃 | 无卤阻燃 |
|---|
| 阻燃效率 | 高 | 中高 |
| 燃烧烟/腐蚀 | 烟大、腐蚀 | 低烟低腐蚀 |
| 成本 | 低 | 高 |
| 应用 | 常规电子 | 新能源、出口、轨交 |
| 物性影响 | 中 | 中高 |
路线选择，跟着行业走——常规电子含卤够用，新能源和出口件直接上无卤。
新能源是阻燃 TPE 这两年的大增量：电池包密封、充电桩线缆、储能外壳，全是阻燃+无卤+耐温的多重要求——材料单价高，
但需求稳定、账期好。
做新能源件的，选型标准要高一个档：无卤+V0+长期耐温，三个硬指标一次到位。
潮态测试是无卤体系的功课：无卤阻燃剂吸水性强，潮湿环境下阻燃可能掉级——所以无卤阻燃料要做“恒温恒湿处理后复测”V0。
湿度敏感是无卤的天性，验收时把这个动作加上。
阻燃虚标、析出、发脆：三个坑一次说透
坑一 · V0 和无卤混为一谈：V0 是等级，无卤是成分——V0 不一定无卤，无卤不一定 V0。规避：两个要求分开写，分开验证。
无卤的门槛要落到数上：参照 IEC 61249-2-21，氯、溴各小于 900ppm、卤素合计小于 1500ppm 才算无卤。验收时要卤素含量报告，别只听“无卤”两个字。
阻燃还有个“颜色”影响：深色料阻燃剂分散好做，浅色料阻燃剂容易“浮色”发白——浅色阻燃料的配方难度和成本都高一档。
做浅色阻燃件的，预算要给足，别拿深色料的报价来套。
坑二 · 阻燃剂析出：阻燃剂相容性差，表面析出发白——析出件，外观和阻燃一起掉。规避：要求供应商做老化析出测试。
阻燃配方要做到可追溯：阻燃剂种类、加量、批号都要查得到——出了问题，能快速定位是哪个环节。
选供应商时问一句“阻燃配方台账全不全”，专业和业余立刻现形。配方可追溯，是安全件供应的基本素养。
等级标注要按规范写全：对外标注阻燃等级，要带“测试厚度+标准”——比如 V0（1.6mm，UL94），信息完整才专业。标注缺胳膊少腿，客户容易误读，出问题说不清。
深色阻燃料的颜色漂移要盯：阻燃剂和颜料相互作用，可能让深色料批次间对不上色——深色阻燃料的对色难度更高。
所以阻燃深色料要“批次对色”验收，色差 ΔE 控制线写进标准。
坑三 · 阻燃掉在油分上：为柔软多加油，阻燃等级就掉——柔软和阻燃是矛盾需求。规避：明确柔软目标值，让配方在两者间平衡。
阻燃剂的“析出”还有个测试方法：高温高湿老化一周，看表面发白、喷霜——阻燃剂相容性差就会析出，析出后阻燃性能也跟着掉。
验收时把“老化后表面状态”加进去，别只看新鲜样件。
阻燃料到货三笔账，UL黄卡必查
- 1. 问等级：UL94 什么等级？测试厚度是多少？——厚度不同，等级不同；
- 2. 问卤素：卤素含量报告有没有？无卤标准（如 IEC61249）对得上吗？
- 3. 问批次：阻燃等级批次波动多大？——阻燃剂分散不均，批次就掉级；
- 4. 验实物：送样实测 UL94，按实际厚度测，别按报告厚度信。
复测留样要成惯例：阻燃件每批留样，出争议时送第三方复测 UL94——留样和报告对得上，供应商和客户都放心。
阻燃是安全项，留样复测是行业做法，不是不信任。
烟毒这条线别只盯 V0：V0 只管燃烧快慢，烟密度和烟气毒性是另一关——公共场合、轨道交通的线缆和密封件，烟毒要求严。
高端阻燃料要看“烟密度+毒性指数”，不只是 V0。V0 是基本盘，烟毒是加分线。
科隆客户案例：硬度漂移换体系，低温弯折一次过
合肥一家线缆厂，阻燃料硬度批次漂移，手感忽软忽硬。科隆配合换体系换牌号（如 SEBS 基换 TPV 基），-40℃ 低温弯折一次通过。
阻燃料的批次稳定，是“等级+手感”双保险——体系换对，两个问题一起解。
认证周期要提前算：UL94 认证从送样到拿证，正常要几周到几个月——阻燃件换料要提前规划认证周期，别等订单来了才送样。认证周期算进排产计划，才不会被卡单。
储存要防潮：无卤阻燃剂吸湿性强，料一受潮，阻燃性能可能往下掉——所以阻燃料要防潮存放，开封后尽快用完，雨季尤其盯紧。仓储管不好，材料等级再好也白搭。
小结
V0 是及格线，无卤是加分项，阻燃 TPE 的账，要按行业要求算。
阻燃 TPE 的选型是“等级×路线×平衡”三件事——先定标准，再选路线，最后对物性，阻燃才靠得住。
认证文件要按产品归档：UL94 报告、无卤检测报告、RoHS 报告，分门别类存好——客户审厂、市场抽检，随时能拿出来。文件管理，是阻燃供应的基本素养。
我们交付的，不只是一包料。
The charging case can't pass V0, and the entire batch is stuck at safety certification and can't be shipped. For flame-retardant TPE, don't place an order if you haven't clarified whether it contains halogens or is halogen-free.
Conclusion first: V0 is the pass line, and halogen-free is a bonus.
Flame-retardant TPE, used in charging pile cables, power cords, electronic housings, and battery pack seals — conclusion in one sentence: UL94 V0 is the passing line, halogen-free is a bonus, halogenated flame retardant and halogen-free flame retardant are two separate paths.
Many purchasers treat 'V0' as the end point — V0 is just the safety baseline. More and more industries (especially new energy and export electronics) require halogen-free. V0 and halogen-free are not the same thing.
The flame retardant rating follows the wall thickness: for the same grade, with wall thicknesses of 0.8mm and 1.6mm, the UL94 rating may differ—the thinner it is, the harder it is to meet the standard.
So when selecting flame-retardant TPE, the 'actual wall thickness' should be included in the working conditions, and the rating should be measured according to the actual thickness. If you only trust the thick-wall report, it's common for thin-wall parts to downgrade after mass production.
| UL94 rating | Requirement | Applicable |
|---|
| V2 | 30s self-extinguishing | general |
| V1 | Self-extinguishing in 30 seconds | electron |
| V0 | 10s self-extinguishing | Power cover |
| VW-1 | Cable Grade | Cable |
Why TPE: The Three Levels of Flame Retardancy
Level One · Flame Retardant Rating: UL94 V0 / V1 / V2 — V0 has the highest requirement, self-extinguishing within 10 seconds. If the rating is insufficient, the safety line is broken.
Standards first align with the market: UL94 is the American system, domestic standards have GB, and exports to Europe follow EN/IEC—different markets mean different testing methods.
For those doing export shipments, clearly list the 'target market standards,' don't just rely on a single UL94 report. If the standards don't match, the certification is pointless.
Don't miss this about the glowing wire test: Plastic parts of household appliances and electrical products often need to pass the glowing wire test (IEC 60695, etc.) — the glowing wire test and UL94 are two different systems, passing V0 does not mean passing the glowing wire test.
For those making household appliance parts, include 'heating wire' in the requirements as well.
Level Two · Halogenated vs Halogen-Free: **Halogenated flame retardants (such as bromine-based) have high flame retardant efficiency but produce corrosive gases when burned;
Halogen-free flame retardant (phosphorus-nitrogen system), low smoke and low corrosion — new energy, rail transportation, export electronics, halogen-free is a strict requirement.
Level Three · Balance Between Flame Retardancy and Material Properties: If you add too much flame retardant, softness, strength, and heat resistance all decrease — getting all three — 'V0, soft, halogen-free' — requires formulation skill.
The trap of cheap flame retardants lies in hidden costs: either the flame retardant is heavily filled and has poor physical properties, or the rating is falsely labeled—the money saved on the material will ultimately be paid back through customer complaints.
When choosing flame-retardant materials, ask about the price and verify the data.
Routine sampling inspections after mass production need to keep up: Check the flame-retardant grade by batch. It is not necessary to send every batch to a third party—simple in-house inspections (self-extinguishing time, burning length) can quickly determine it.
Daily spot checks fluctuate by batch, and disputes arise when third-party retests are conducted, so two layers of safeguards are needed for stability. Once spot check data has been accumulated for three months, the batch fluctuation curve can be understood at a glance.
The balance between flame retardancy and material properties is often described in the industry as a 'triangle': flame retardancy, softness, and heat resistance—at most, you can maintain two of the three at the same time. If you want V0 and softness, heat resistance may need to be compromised; if you want V0 and heat resistance,
Softness may compromise.
So when selecting a model, you need to prioritize the 'three items,' so the supplier knows in which direction to adjust the formula.
Technical Tip: When selecting flame-retardant TPE, first determine the grade (V0/V1/V2), then choose the type (halogenated/halogen-free), and finally balance (softness and temperature resistance).
Flame retardant conditions: hot wire, oxygen index, smoke density, halogen system
| Operating condition item | Why ask | Affect what |
|---|
| What app | Cables/Housing/Seals | Level and route |
| What standard | UL94/UL1581/VW-1 | Different testing methods |
| Halogen requirements | Halogen-free or halogen-containing | Combustion product requirements |
| What physical properties? | Hardness, temperature resistance, strength | Formula balance point |
Comparison Table: Halogenated vs Halogen-Free Flame Retardant TPE
| Dimension | halogen-containing flame retardant | halogen-free flame retardant |
|---|
| Flame retardant efficiency | Tall | Medium-high |
| Burning smoke/corrosion | Smoke and corrosion | Low smoke, low corrosion |
| Cost | Low | Tall |
| Application | Conventional electronics | New energy, exports, rail transit |
| Physical properties influence | middle | Medium-high |
Route selection, follow the industry — conventional electronics with halogens are sufficient, for new energy and export components, go directly with halogen-free.
New energy has been the major growth area for flame-retardant TPE in the past two years: battery pack sealing, charging pile cables, energy storage housings—all require multiple specifications such as flame retardancy, halogen-free, and heat resistance—resulting in high material unit prices.
But the demand is stable and the payment terms are good.
For making new energy components, the selection standards should be one level higher: halogen-free V0, long-term heat resistance, all three hard specifications met in one go.
Moisture testing is a task for halogen-free systems: halogen-free flame retardants are highly hygroscopic, and their flame retardancy may decrease in a humid environment—so halogen-free flame retardants need to undergo 'retesting for V0 after constant temperature and humidity treatment'.
Humidity sensitivity is inherently halogen-free, so include this step during acceptance.
False flame retardant labeling, exudation, and embrittlement: Explaining the three pitfalls at once
Pitfall 1 · Confusing V0 with halogen-free: V0 is a rating, halogen-free is a component—V0 is not necessarily halogen-free, and halogen-free is not necessarily V0. Avoidance: write the two requirements separately and verify them separately.
The threshold for halogen-free must fall on numbers: according to IEC 61249-2-21, chlorine and bromine must each be less than 900 ppm, and the total halogen content must be less than 1500 ppm to be considered halogen-free. When accepting, there should be a halogen content report, not just relying on the words "halogen-free."
Flame retardancy also has a 'color' effect: flame retardants disperse well in dark materials, while in light-colored materials, flame retardants tend to 'float' and turn white—formulating light-colored flame retardant materials is more difficult and costly.
For making light-colored flame-retardant parts, the budget should be sufficient, don't use the quotes for dark-colored materials as a reference.
Pitfall 2 · Flame Retardant Precipitation: Poor compatibility of flame retardants causes surface whitening due to precipitation — precipitated parts, appearance and flame retardant come off together. Mitigation: Require suppliers to perform aging precipitation tests.
Flame retardant formulas must be traceable: the type, dosage, and batch number of flame retardants must be traceable—if a problem occurs, quickly pinpoint which step it is.
When choosing suppliers, ask "Is the flame retardant formula ledger complete?" and professional and amateur information will immediately become clear. Formula traceability is a fundamental quality in safety parts supply.
Grade labeling must be fully specified according to standards: when labeling flame retardant externally, include "test thickness + standard"—for example, V0 (1.6mm, UL94). Complete information is professional. Labeling lacks arms and legs, making it easy for customers to misread and make it hard to explain if problems arise.
Focus on color drift in dark flame retardant fuels: Flame retardants interact with pigments, which may cause color matching between batches of dark pigments—making color matching more difficult for dark flame retardant fuels.
Therefore, flame retardant dark pigments must be "color matched" for inspection, and color difference ΔE control lines should be written in the standard.
Pitfall 3 · Fuel retardant drops on oil content: Adding more oil to softness lowers the flame retardant rating—softness and flame retardant are contradictory requirements. Avoidance: Clarify the target value for softness, so the formula balances the two.
Another test method for flame retardant "precipitation": after aging at high temperature and humidity for a week, the surface turns white and frosty—poor flame retardant compatibility leads to precipitation, and after precipitation, flame retardant performance also drops.
During acceptance, add the "surface condition after aging"; don't just look at fresh samples.
Three records of fuel arriving at the factory, must check UL yellow cards
- 1. Grade question: What grade is UL94? What is the test thickness? ——Different thicknesses mean different grades;
- 2. Ask about halogens: Is there a halogen content report? Are halogen-free standards (such as IEC61249) accurate?
- 3. Ask about batches: How much does flame retardant grade fluctuate in batches? ——If flame retardants are unevenly dispersed, the batch grade drops;
- 4. Physical inspection: Send samples for actual UL94 measurement, measure according to actual thickness, not trust by reported thickness.
Retest and retain samples as a rule: keep samples for each batch of flame retardants, and if disputes arise, send to a third party for re-testing UL94—if the samples match the report, suppliers and customers can rest assured.
Flame retardancy is a safety item; retesting samples is an industry practice, not distrust.
Don't focus only on V0 for smoke and poison: V0 only cares about burn speed; smoke density and smoke toxicity are another key issue—cables and seals in public places and rail transit have strict smoke toxicity requirements.
High-end fuel barriers should look at "smoke density + toxicity index," not just V0. V0 is the foundation, and tobacco and poison are the main plus.
Cologne customer case: hardness drift system change, low-temperature bending in one go
Hefei cable factory, block fuel hardness batch drift, hand feel fluctuating between soft and hard. Cologne cooperated with system replacement and grade change (such as SEBS base to TPV base), passing -40°C low-temperature bending in one go.
Fuel resistance batch stability is a double insurance of "grade + feel"—system replacement correctly solves both problems together.
Certification cycle must be calculated in advance: UL94 certification usually takes several weeks to months from sample submission to certificate receipt — flame-retardant material replacement requires planning certification cycle in advance, don't wait until orders arrive. Include the certification cycle in the production schedule to avoid being stuck on the list.
Moisture-proof storage: halogen-free flame retardants are highly hygroscopic, and once the material gets damp, its flame retardant performance may decline—so anti-corrosion fuels must be stored moisture-proof and used up quickly after opening, especially during the rainy season. If storage management is poor, no matter how good the material grade is, it's useless.
Summary
V0 is the passing line, and halogen-free is a plus. The cost of flame-retardant TPE must be calculated according to industry requirements.
Choosing flame-retardant TPE involves "level× route× balance"—first set standards, then choose routes, and finally, based on physical properties, only flame retardancy can be relied upon.
Certification documents should be archived by product: UL94 reports, halogen-free test reports, RoHS reports, categorized and stored—customer audits, market spot checks, ready to be retrieved at any time. Document management is a fundamental quality in flame-retardant supply.
What we deliver is not just a package of materials
