户外件图便宜用了 SBS，一个夏天就黄变。SEBS 和 SBS 一字之差，耐候差一个时代。
氢化的“成本”不小：SBS 到 SEBS 要加氢处理，工艺复杂、产能受限，价格自然高。多花的钱买什么？买耐候、买寿命、买高端应用的门票——值不值，看场景。
SEBS 的“加氢度”有讲究：加氢不完全，性能打折。问供应商要“加氢度”数据——加氢度高的 SEBS，耐候和稳定性才到位。这个指标，是 SEBS 牌号的分水岭。
SEBS 的“分子量”影响手感：分子量高，强度高、回弹好，但加工难；分子量低，软但强度差。
超软配方怎么平衡，是配方师的真功夫——选牌号时把“目标硬度+回弹”一起报。
SEBS 的“充油”学问：充油量决定软度，油品决定气味和析出。低气味、食品级场景，油品等级是关键——充油比例好抄，油品等级难做。
加氢度是 SEBS 牌号的分水岭：问供应商要加氢度数据，加氢不完全的牌号耐候和存放稳定性都打折，
含双键残留多的放两年就发硬。
SEBS 的“加工”窗口：熔融温度、剪切敏感性和 SBS 不同。工艺卡要按 SEBS 重新标定——套用 SBS 参数的，外观和尺寸都会出问题。
SEBS 的“助剂”体系：抗氧剂、光稳定剂、润滑剂，影响气味和寿命。低气味、户外场景，助剂清单要评估——助剂选错，性能打折。
SEBS 和 SBS 的“提醒”：一字之差，寿命差一个时代——预算允许，SEBS 更稳。
SEBS 和 SBS 的“应用”对照：鞋材量大用 SBS，高端件保值用 SEBS——分场景，不分高下。
一句话结论：SEBS 是 SBS 的“氢化升级版”，户外和长期件认 SEBS
SBS 和 SEBS 是苯乙烯类热塑性弹性体的两兄弟：SBS 的中段是聚丁二烯（含双键），SEBS 把双键氢化成了饱和链段。
一个字母之差，带来的是耐候、耐温、耐老化的全面升级。
| 维度 | SBS | SEBS |
|---|
| 分子结构 | 含双键 | 氢化饱和 |
| 耐候 | 差，易老化 | 好 |
| 耐温 | 低 | 高 |
| 强度 | 中 | 高 |
| 价格 | 低 | 高 |
| 典型用途 | 鞋底、沥青改性 | 高端弹性体 |
技术金句：SBS 是“价格友好型”，SEBS 是“寿命友好型”——要寿命，先氢化。
耐候验收别只看“耐 UV”三个字：把氙灯老化 500h、1000h 后的色差和拉伸强度保留率一起要，保留率低于 70% 的别上户外件。
判据一 · 耐候和老化：双键是软肋
耐候的“测试”要看长：SBS 和 SEBS 的差异，短期看不出来，氙灯老化、紫外老化几百小时才见分晓。
选料时要求供应商给“老化前后强度保留率”数据——没有这个数据，耐候就是空话。
SBS 的双键容易和氧、臭氧、紫外线反应——户外件、长期件，SBS 会变硬、变脆、开裂。SEBS 氢化后没有双键，耐候、耐老化明显上台阶：
- 户外场景：SEBS 是主力，SBS 要谨慎；
- 长期储存：SEBS 性能衰减少，SBS 放几年会老化；
- 高温场景：SEBS 耐温更高，SBS 高温易降解。
判据二 · 力学和手感：各有所长
SBS 和 SEBS 的“加工”差异：SBS 熔融流动性好、加工温度低；SEBS 温度要求高些、窗口窄些。模具和工艺参数不能通用——换体系，先换工艺卡。
SBS 的“鞋材”应用还在：鞋底、鞋垫量大价低，SBS 依然是主力。SBS 不是被淘汰，是退到“成本敏感场景”——选型先分场景，再谈升级。
SBS 的“沥青改性”：SBS 在防水卷材、沥青改性里用量大，是它的另一主场。材料没有高低，只有用对用错——SBS 在建筑里，照样是主角。
SBS 的“库存”管理：SBS 含双键，久存会老化。先进先出、避光存放，是 SBS 仓储的基本功——库存管理，直接决定批次一致性。
SBS 的“配方”灵活性：SBS 常做共混（和 PS、PP 等），配方空间大。共混体系的性能，靠配方师调——找有配方能力的供应商，比买牌号重要。
- SBS：刚性略高、耐磨好，价格低——鞋底、沥青改性、廉价玩具是它的主场；
- SEBS：回弹好、柔软可调、手感细腻——包胶、密封、医疗、食品级是它的主场。
| 场景 | 推荐 | 理由 |
|---|
| 鞋底 | SBS | 成本 |
| 包胶手柄 | SEBS | 手感 |
| 户外密封 | SEBS | 耐候 |
| 沥青改性 | SBS | 相容性 |
判据三 · 超软料的模具要点：软不是越软越好
超软料的“成本”也高：SEBS 超软配方充油多、助剂讲究，单价不低。
但超软料的“手感溢价”值得——高端母婴、个护产品，手感就是卖点，软料的贵是卖点的一部分。
SEBS 基超软料（Shore 00-20A），是“手感天花板”，但模具和工艺要特殊对待：
- 1. 脱模：超软料易粘模、拉伤——脱模斜度要加大，顶出要柔和；
- 2. 浇口：超软料流动性好，浇口要小，防止溢料；
- 3. 收缩：超软料收缩率大，尺寸控制难——模腔尺寸要预留；
- 4. 冷却：软料散热慢，冷却要足，防止变形。
超软料的翻车，一半在模具，一半在工艺——模具设计阶段就要把软料的特性算进去，别等试模再改。
三个问题定体系：户外、长期、超软
SEBS 的“牌号速查”怎么用：先对硬度档，再对性能要求（耐候或食品级或超软），最后对应用场景。
速查表不是万能，是帮你“缩小候选范围”——候选缩小了，打样才高效。
SEBS 的“食品级”认证：SEBS 基 TPE 是食品级主力，但认证要逐牌号做。TDS 写着“可食品接触”的，要核对报告覆盖的牌号和检测项——覆盖不到，等于没有。
SEBS 的“医疗级”路径：SEBS 基是医疗 TPE 的主力，无 DEHP、生物相容性好。医疗项目选 SEBS 基，认证和体系都顺——但超软医疗件，配方和验证要更细。
SEBS 的“配色”稳定性：浅色、透明 SEBS 件，耐光色牢度要验证。户外浅色件（鞋材、家居）变色投诉，多半是色牢度没做——色牢度测试，浅色件别省。
SEBS 的“供应”预案：SEBS 特种牌号交期长，常备库存。供应预案写进采购计划——断料一次，损失比库存成本大。
SEBS 的“验收”：硬度、回弹、耐候、气味，四项留样——批次换了，先对比再放量。
- 1. 问寿命：件要用几年？户外还是室内？——要寿命、要户外，SEBS；
- 2. 问成本：低价走量、寿命要求不高？——SBS 更划算；
- 3. 问手感：要细腻柔软、长期稳定？——SEBS 基超软料。
SEBS 和 SBS 的区别，还可以从成本结构看：SBS 原料路线成熟、产能大，价格更低；SEBS 多了加氢工序，成本高一截。
采购在预算有限时，先确认件是否真的需要耐候，能用 SBS 就先用 SBS，把 SEBS 留给户外和长期耐老化的场景，钱花在刀刃上。
| 维度 | SEBS | SBS | 判断 |
|---|
| 耐候 | 好 | 差 | 户外选SEBS |
| 价格 | 高 | 低 | 预算选SBS |
| 强度 | 中 | 中 | 平手 |
| 加工 | 好 | 好 | 平手 |
科隆客户案例：收缩率不稳尺寸波动，换体系连续三批续单
重庆一家改性料应用厂，SEBS/SBS 超软件收缩率不稳、尺寸波动大。科隆配合换体系换牌号（SEBS 基换 TPV 基），尺寸稳定后连续三批续单。
收缩率不稳，先看体系再看工艺——体系换对，尺寸就稳了。
小结
SEBS 和 SBS：问寿命、问成本、问手感——三问过完，选哪个就清楚了。
如果你正卡在SEBS的选型上，把工况发过来，我们对一遍，多对一次，少错一次。
SEBS 和 SBS 的“选型收尾”：硬度、耐候、食品级、成本，四项过一遍，选谁就清楚了。剩下的交给打样验证——纸面选型，永远差一次实打。
SEBS 和 SBS 的“一句话”：一字之差，寿命差一个时代——预算允许，SEBS 是更稳的选择。
SEBS 和 SBS 的“临门一脚”：硬度、耐候、食品级、成本四项过一遍，再打一次样。样品说话，比口说强——临门一脚，用数据收尾。
SEBS 和 SBS 的“收尾”：氢化多花的钱，是买寿命和口碑——算长账，答案很清楚。
SEBS 和 SBS 的“三补”：预算紧看 SBS，性能稳选 SEBS——各安其位。
SEBS 和 SBS 的“四补”：食品级、耐候、超软三场景，SEBS 是默认解。
SBS 和 SEBS 的“混用”要避免：同一产线混用两兄弟，容易搞混批次。管理上建议分开存放、分开标识——一袋搞混，整批性能说不清。
SEBS 和 SBS 的“价格趋势”：SEBS 产能扩张，价格在走低；SBS 相对稳定。价差收窄后，更多场景愿意上 SEBS——选型时把“价格趋势”也看一眼，别用昨天的价差定今天的方案。
SEBS 的“供应”格局：SEBS 主要产能集中，牌号供给有讲究。大宗牌号好买，特种牌号要等——交期敏感的项目，选料时把“现货情况”一起问。
SEBS 的“生物基”方向：生物基 SEBS 在高端品牌试水，价格高、量还小。关注趋势，但别为概念买单——常规项目用常规牌号，趋势留给试点。
SEBS 的“配色”能力：SEBS 基可以做出透明、高透、多彩，SBS 偏黄。外观要求高的件（透明玩具、彩色手柄），SEBS 更稳——颜色是卖点的产品，别省这个钱。
The outdoor part drawings were cheaply made with SBS, and it turned yellow after just one summer. There's only a one-letter difference between SEBS and SBS, but the weather resistance is worlds apart.
The 'cost' of hydrogenation is not small: going from SBS to SEBS requires hydrogenation treatment, which is a complex process with limited capacity, so the price is naturally high. What do you get for the extra money? You get weather resistance, longer lifespan, and access to high-end applications—whether it's worth it depends on the situation.
The 'degree of hydrogenation' of SEBS is important: incomplete hydrogenation compromises performance. Ask suppliers for the 'degree of hydrogenation' data—only SEBS with a high degree of hydrogenation has proper weather resistance and stability. This indicator is the dividing line between SEBS grades.
The 'molecular weight' of SEBS affects the feel: high molecular weight means high strength and good elasticity, but difficult to process; low molecular weight means soft but with poor strength.
How to balance an ultra-soft formula is the true skill of a formulator—when selecting the grade, report both the 'target hardness and rebound' together.
The 'oil filling' knowledge of SEBS: the amount of oil determines the softness, and the type of oil determines the smell and exudation. For low-odor, food-grade applications, the oil grade is key—the oil filling ratio is easy to copy, but the oil grade is hard to achieve.
The degree of hydrogenation is the dividing line for SEBS grades: ask the supplier for the hydrogenation data; grades that are not fully hydrogenated have reduced weather resistance and storage stability.
Products with a high content of double-bond residues will harden after being stored for two years.
The 'processing' window of SEBS: its melting temperature and shear sensitivity are different from SBS. The process card must be recalibrated for SEBS — if SBS parameters are used, the appearance and dimensions will have problems.
The 'additive' system of SEBS: antioxidants, light stabilizers, lubricants, which affect odor and lifespan. For low odor and outdoor scenarios, the list of additives needs to be evaluated — if the additives are chosen incorrectly, performance is compromised.
The 'reminder' about SEBS and SBS: Just one word different, but the lifespan differs by an era—if the budget allows, SEBS is more stable.
Comparison of 'applications' of SEBS and SBS: SBS is used in large quantities for shoe materials, while SEBS is used for high-end parts to preserve value — it's about different scenarios, not superiority.
One-sentence conclusion: SEBS is the 'hydrogenated upgraded version' of SBS, recognized for outdoor and long-term applications.
SBS and SEBS are two siblings of styrene-based thermoplastic elastomers: the middle segment of SBS is polybutadiene (containing double bonds), while SEBS hydrogenates the double bonds into saturated segments.
A difference of one letter brings comprehensive upgrades in weather resistance, temperature resistance, and aging resistance.
| Dimension | SBS | SEBS |
|---|
| Molecular structure | Contains double bond | Hydrogenation Saturation |
| Weather-resistant | Poor, prone to aging | Good |
| Temperature resistant | Low | Tall |
| Intensity | middle | Tall |
| Price | Low | Tall |
| Typical uses | Sole, asphalt modification | High-end elastomer |
Technical catchphrase: SBS is 'price-friendly,' SEBS is 'longevity-friendly'—for durability, hydrogenate first.
When conducting weathering acceptance, don’t just look at the three words 'UV resistant': consider both the color difference and the retention rate of tensile strength after xenon lamp aging for 500h and 1000h. Do not use outdoor parts if the retention rate is below 70%.
Criterion One · Weather Resistance and Aging: Double Bonds Are the Weak Point
The 'testing' for weather resistance depends on the duration: the difference between SBS and SEBS cannot be seen in the short term; it takes hundreds of hours of xenon lamp aging or UV aging to find out.
When selecting materials, suppliers are required to provide the 'strength retention rate before and after aging' data—without this data, weather resistance is just empty talk.
The double bonds in SBS easily react with oxygen, ozone, and ultraviolet light — for outdoor parts and long-term use, SBS will become hard, brittle, and crack. After hydrogenation, SEBS has no double bonds, and its weather resistance and aging resistance are significantly improved:
- Outdoor scenarios: SEBS is the main choice, SBS should be used with caution;
- Long-term storage: SEBS performance degrades, SBS will age after a few years;
- High-temperature scenarios: SEBS has higher temperature resistance, while SBS easily degrades at high temperatures.
Criterion Two · Mechanics and Feel: Each Has Its Strengths
Processing differences between SBS and SEBS: SBS has good melt flow and a low processing temperature; SEBS requires a higher temperature and has a narrower window. Molds and process parameters are not interchangeable—when switching systems, change the process card first.
The "shoe material" applications of SBS are still there: shoe soles and insoles are large in quantity and low in price, and SBS is still the mainstay. SBS has not been eliminated; it has retreated to "cost-sensitive scenarios" — first select according to the scenario, then discuss upgrades.
SBS 'asphalt modification': SBS is used in large quantities in waterproof membranes and asphalt modification, which is another of its main areas. Materials are not high or low in quality, only correctly or incorrectly used—SBS in construction is still the main character.
Inventory Management of SBS: SBS contains two bonds and will age if stored for a long time. First-in, first-out and storing away from light are the fundamentals of SBS warehousing—inventory management directly determines batch consistency.
Flexibility of SBS 'formulations': SBS is often blended (with PS, PP, etc.), offering a wide formulation space. The performance of the blend system depends on the formulator's adjustments — finding a supplier with formulation capabilities is more important than buying a specific grade.
- SBS: Slightly higher rigidity, good wear resistance, low price—its main applications are shoe soles, asphalt modification, and cheap toys;
- SEBS: Good rebound, adjustable softness, delicate touch — its main applications are coating, sealing, medical, and food-grade uses.
| Scene | Recommend | Reason |
|---|
| Sole | SBS | Cost |
| Rubber-coated handle | SEBS | hand feel |
| Outdoor sealed | SEBS | weather-resistant |
| Asphalt modification | SBS | Compatibility |
Criterion Three · Key Points for Molds of Ultra-Soft Materials: Softer Is Not Always Better
The 'cost' of ultra-soft materials is also high: SEBS ultra-soft formulas contain a lot of oil and sophisticated additives, and the unit price is not low.
But the 'tactile premium' of ultra-soft materials is worth it — for high-end maternal and baby products and personal care items, feel is the selling point, and the cost of soft materials is part of that selling point.
SEBS ultra-soft base material (Shore 00-20A) is the 'touch sensation ceiling,' but the mold and process need special handling:
- 1. Demolding: Ultra-soft materials easily stick to the mold and tear—demolding angles should be increased, and ejection should be gentle;
- 2. Gate: For ultra-soft materials with good fluidity, the gate should be small to prevent overflow.
- 3. Shrinkage: Ultra-soft materials have a high shrinkage rate, making size control difficult — the mold cavity size should be reserved.
- 4. Cooling: Soft materials dissipate heat slowly, so ensure adequate cooling to prevent deformation.
The failure with super soft materials is half due to the mold and half due to the process — the characteristics of soft materials need to be accounted for during the mold design stage, not waiting to make changes during trial molding.
Three questions define the system: outdoor, long-term, ultra-soft
How to use SEBS 'Grade Quick Lookup': first check the hardness range, then the performance requirements (weather resistance, food grade, or ultra-soft), and finally the application scenario.
A quick reference table is not万能, it helps you 'narrow down the candidate range' — once the candidates are narrowed, proofing becomes efficient.
SEBS 'food grade' certification: SEBS-based TPE is the main food-grade material, but certification needs to be done for each grade. If the TDS states 'food contact safe,' the report covering the specific grade and test items needs to be verified — if it doesn't cover them, it's equivalent to not having it.
The "medical-grade" path of SEBS: SEBS-based materials are the mainstay of medical TPE, free of DEHP, and have good biocompatibility. For medical projects, SEBS-based materials are chosen, and certifications and systems are straightforward — but for ultra-soft medical components, formulation and validation need to be more meticulous.
Color stability of SEBS: For light-colored and transparent SEBS parts, lightfastness needs to be verified. Complaints about discoloration of outdoor light-colored parts (footwear, home products) are mostly due to lack of colorfastness testing — do not skimp on colorfastness tests for light-colored parts.
SEBS 'Supply' Plan: SEBS specialty grades have long lead times, with regular stock on hand. The supply plan is included in the procurement plan—if material supply is interrupted once, the loss is greater than the inventory cost.
SEBS 'Acceptance': Hardness, rebound, weather resistance, odor, four items for sample retention — when the batch changes, compare first before increasing the quantity.
- 1. Ask about lifespan: How many years should it last? For outdoor or indoor use? — If you want durability and outdoor use, SEBS;
- 2. Regarding cost: Low price for high volume, not high lifespan requirement? — SBS is more cost-effective;
- 3. Ask about the feel: Should it be delicate, soft, and long-lasting? — SEBS-based ultra-soft material.
The difference between SEBS and SBS can also be seen from the cost structure: SBS has a mature raw material route and large production capacity, making it cheaper; SEBS involves an additional hydrogenation process, which makes it significantly more expensive.
When the budget is limited, procurement should first confirm whether the part really needs weather resistance. If SBS can be used, use SBS first, and reserve SEBS for outdoor and long-term aging-resistant scenarios, so the money is spent wisely.
| Dimension | SEBS | SBS | Judgment |
|---|
| Weather-resistant | Good | poor | Choose SEBS for outdoor use |
| Price | Tall | Low | Budget choose SBS |
| Intensity | middle | middle | Tie |
| Processing | Good | Good | Tie |
Cologne client case: unstable shrinkage rate and size fluctuation, switching systems for three consecutive batch orders
A modified material application factory in Chongqing experienced unstable shrinkage and large dimensional fluctuations with SEBS/SBS super soft materials. Cologne cooperated to change the system and grade (SEBS-based switched to TPV-based). After the dimensions stabilized, three consecutive batches were reordered.
If the shrinkage rate is unstable, first look at the system, then look at the process—if the system is changed correctly, the dimensions will become stable.
Summary
SEBS and SBS: Ask about lifespan, cost, and feel—after asking these three questions, it will be clear which one to choose.
If you are stuck on selecting SEBS, send over the working conditions, and we will go through them once; double-checking once means one less mistake.
The "final selection" for SEBS and SBS: hardness, weather resistance, food grade, and cost—go through all four, and it will be clear which one to choose. The rest is left to sample testing—paper selection always falls short of actual testing.
The 'one-sentence summary' of SEBS and SBS: A single character difference, a lifetime spanning an era—if the budget allows, SEBS is the more stable choice.
The 'final touch' for SEBS and SBS: run through the four aspects of hardness, weather resistance, food grade, and cost, then make another sample. Let the sample speak—it’s more convincing than words—the final touch, finished with data.
The 'final touch' of SEBS and SBS: the money spent on hydrogenation is for buying longevity and reputation — when looking at the long-term, the answer is very clear.
The 'three supplements' of SEBS and SBS: when the budget is tight, look at SBS; for stable performance, choose SEBS—each in its place.
The 'four supplements' of SEBS and SBS: food grade, weather resistance, and ultra-soft for three scenarios, with SEBS being the default solution.
The 'mixed use' of SBS and SEBS should be avoided: mixing the two siblings on the same production line can easily lead to batch confusion. It is recommended to store and label them separately for management purposes—if one bag gets mixed up, the performance of the entire batch becomes unclear.
The 'price trends' of SEBS and SBS: SEBS production capacity is expanding, and prices are falling; SBS is relatively stable. After the price gap narrows, more scenarios are willing to adopt SEBS—when choosing materials, also take a look at the 'price trend,' and don’t base today’s plan on yesterday’s price difference.
The 'supply' pattern of SEBS: SEBS production capacity is mainly concentrated, and there are considerations in grade supply. Common grades are easy to buy, while specialty grades require waiting—for projects sensitive to delivery times, inquire about the 'availability of stock' when selecting materials.
The 'bio-based' direction of SEBS: Bio-based SEBS is being tested by high-end brands, with high prices and low volumes. Pay attention to the trend, but don’t pay for the concept—use regular grades for conventional projects, and leave trends to pilots.
The "color matching" ability of SEBS: SEBS polymers can be made transparent, highly transparent, and colorful, while SBS tends to be yellowish. For parts with high appearance requirements (transparent toys, colorful handles), SEBS is more stable — for products where color is a selling point, don't skimp on this cost.
