做电线电缆料的圈子里有个心照不宣的现象：大家都在找低烟无卤、找耐温等级，找来找去，却很少有人主动提EMMA。一提这个牌号，供应商要么说"这个货少"，要么报个价让你猜。同样叫EMMA副牌，价格能差出三成，熔指从0.3跳到450都有人敢卖给你，最后做出来的绝缘层一押花就开裂。
说白了，EMMA这个品类，水比你想象的深。不是因为它难，而是因为知道它底细的人太少。今天就把这个品类掰开揉碎，讲清楚哪些厂在做、副牌从哪来、怎么挑才不踩坑。
EMMA是什么，为什么线缆圈偷偷在用
EMMA，乙烯-甲基丙烯酸甲酯共聚物，听名字跟EMA、EBA像亲戚，但分子链上挂的是MMA——甲基丙烯酸甲酯。这个单体带来的特点是：加工温度比EVA宽、热稳定性好、低气味，而且跟极性材料的粘接性比普通PE强。
它跟LDPE加工性能接近，但柔软度和透明性更好。在线缆领域，EMMA主要做绝缘层的改性剂和护套料的增韧组分，尤其是需要耐温、低烟、无腐蚀的场合。做薄膜的把它当哑光膜的底料，做热熔胶的拿它做高粘组分。
全球格局很有意思：EMMA这个品类的商业化生产，住友化学在全世界头一家做到量产，牌号叫ACRYFT。其他大厂在乙烯-丙烯酸共聚物这个大家族里各有布局，但纯EMMA牌号的供应商屈指可数。这是一个典型的寡头型品类——不是谁都能做，是做的人本来就少。
副牌到底是什么，跟回料差在哪
讲EMMA副牌之前，先把副牌这个概念说透。副牌料，是同一厂家同一牌号产品中，出厂检验未完全达到正牌技术指标的那一档。注意，它还是原厂原生聚合粒子，分子结构跟正牌一致，只是个别指标——熔指、色相、透光率、灰分——在检验时小幅偏离了标称值。
它跟回料、再生料完全不是一回事。回料是制品加工边角料再造粒，已经受过一次热历史；再生料是废旧塑料回收造粒，性能波动大。副牌呢？原厂同一批聚合产物，合格贴正牌标签，不完全合格的就是副牌。四大来源：装置开停车的头尾料、牌号切换的过渡料、工艺波动致个别指标小幅超标的批次、副线尾料。
EMMA副牌尤其要小心的一点是：这个品类本身牌号就少，同牌号副牌的流通量更小。有些号称EMMA副牌的货，其实是EMA或EBA冒充的——分子链上挂的酯基不一样，做线缆料的粘接性和耐温性差一截。所以挑EMMA副牌，先确认是不是原厂原牌号，再谈价格。
住友化学：ACRYFT，EMMA这个品类的定义者
住友化学的ACRYFT，是EMMA全球商业化生产的开创者。产品线覆盖通用级、薄膜级、挤出层压级、电线电缆级和热熔胶级，MMA含量从5%到32%全覆盖。线缆级牌号如WH303-F，MMA含量18%，MFR 7，专门面向电线电缆应用。
ACRYFT的特点是低气味、耐热性好。住友化学自己的资料里写得很直白："only manufactured by Sumitomo"。这意味着在EMMA这个细分品类里，住友化学几乎是唯一的规模化供应商。它的副牌料来源，主要是装置牌号切换时的过渡料——从薄膜级切到线缆级，中间过渡那一段，MMA含量和熔指都在飘，但分子链还是EMMA。
挑ACRYFT副牌，关键看MMA含量和MFR两项。这两项对上你的线缆工艺，其他指标小幅浮动一般不影响使用。包装分大包装和小包装两种，大包装适合改性厂批量混料，小包装适合打样和小批量试机。
阿科玛：Lotryl，乙烯-丙烯酸共聚物的老行家
阿科玛的Lotryl系列，主业是EBA和EMA共聚物，但在乙烯-丙烯酸酯这个大家族里布局极广。Lotryl EBA覆盖低中高BA含量，从17%到35%都有；Lotryl EMA也有完整产品线。虽然纯EMMA牌号不是阿科玛的主打，但它在高压自由基聚合这条工艺线上积累的经验，让它的副牌料品质在业内口碑不差。
阿科玛的副牌特点是批次稳定性好。它在法国、北美、亚洲都有装置，牌号切换时的过渡料会流入副牌渠道。做线缆改性的厂拿阿科玛的乙烯-丙烯酸共聚物副牌当增韧剂用，配进PE绝缘料里，提升低温抗冲和粘接性。注意一点：阿科玛的Lotryl副牌要分清是EBA还是EMA——两者的柔软度和粘接温度区间不同，配错了线缆挤出工艺要大调。
杜邦：Elvaloy，特种共聚物的老牌玩家
杜邦的Elvaloy系列，主业是乙烯-丙烯酸酯共聚物和乙烯三元共聚物，主要做增韧剂和改性剂。在PVC增韧、油品改性、线缆料配方里经常能看到Elvaloy的身影。杜邦在路易斯安那、比利时、新加坡都有聚合装置，副牌料的来源以工艺波动批次为主。
Elvaloy副牌的特点是增韧效果稳定。做线缆护套的厂拿它当PE的增韧组分，提升低温脆化温度和抗撕裂强度。杜邦的牌号体系比较成熟，副牌料一般会标明偏离的指标项——比如熔指偏高或偏低，你对着自己的工艺窗口选就行。但要注意，Elvaloy里有些牌号是含三元单体的，跟纯EMMA的加工温度曲线不一样，上机前先试小批量。
挑EMMA副牌，三个坑别踩
第一个坑：拿EMA或EBA冒充EMMA。这是这个品类最常见的猫腻。三个品类名字像，但酯基不一样——EMA挂丙烯酸甲酯，EBA挂丙烯酸丁酯，EMMA挂甲基丙烯酸甲酯。做线缆料的粘接性、耐温、加工温度都不同。验样的时候先看熔指和密度，再上红外谱图确认酯基类型，别光看包装上写什么。
第二个坑：熔指偏差不设上限。EMMA副牌的熔指可能从0.3飘到450，跨度极大。你的线缆工艺窗口如果只适配MFR 2-7的牌号，来了一炉MFR 20的副牌，挤出压力直接不一样，绝缘层壁厚失控。收货前让供应商报实测熔指，别只看标称。
第三个坑：不留样就上机。EMMA副牌批次间的MMA含量可能有1-2个百分点的浮动，做绝缘料配比的时候，这个浮动会影响最终制品的介电性能。每批留1公斤样，做好批号标签，出问题能回溯。
科隆仓库现货｜EMMA灵活
主推品牌：住友化学、阿科玛、杜邦。
主要牌号：ACRYFT（WH303-F）、Lotryl、Elvaloy。
包装规格：小包副牌与箱装副牌走小包装，大包料/吨包料走吨袋，按车间用量分包装备货。
仓库现货：EMMA仓库现货通常在3000-6000吨，其中小包副牌备货500-800吨、箱装副牌备货200-400吨、大包料/吨包料备货2500-4800吨。
供应保障：原厂原包直采，批号随货。
选型口诀和一个连云港的案子
挑EMMA副牌，记住这五条：
一看酯基，红外先验是不是EMMA本体，别拿EMA当EMMA买。
二对熔指，实测值落在你工艺窗口里再收货。
三核MMA含量，做绝缘的对上粘接性要求那一档。
四留批次样，每批留样贴标签，出问题能追溯。
五分包装，大批量改性用大包装，打样试机用小包装。
连云港有家做低压线缆绝缘料的客户，之前一直用正牌EMMA配护套配方，一吨材料成本压不下来。后来试了一批住友化学ACRYFT的线缆级副牌，熔指实测6.8（标称7），MMA含量17.3%（标称18%），两项关键指标都在允许偏差内。上机试产，绝缘层押花不开裂，挤出温度曲线跟正牌基本一致，材料成本每吨降了一千多。做了半年，良率稳定在98%以上。
EMMA副牌是正牌的慢热搭档——同一套高压自由基共聚出来，只是甲酯含量和熔指在出厂时没踩满线，做不了高光外观件，但给线缆做绝缘、给热熔胶当增粘剂却是把好手。宁波市科隆新材料有限公司在进口乙烯共聚物副牌这条线做了多年，住友、阿科玛、杜邦的货源都在跟，类似的案子每年处理几十起。
There's an unspoken phenomenon in the wire and cable material industry: everyone is looking for low smoke, halogen-free and temperature-resistant grades, but very few actively mention EMMA. When this grade is mentioned, suppliers either say "this is in small stock" or quote a price for you to guess. Even with the same EMMA sub-brand, the price difference can be 30%, and the melting index jumps from 0.3 to 450, and someone dares to sell to you. The final insulation layer cracks at the slightest embossing.
To put it bluntly, the EMMA category is deeper than you think. Not because it's difficult, but because too few people know its details. Today, we'll break this category apart, clearly explain which factories are making it, where the sub-brand comes from, and how to choose it to avoid pitfalls. What is
EMMA, and why is it secretly used in cable coils ?
EMMA ethylene-methyl methacrylate copolymer, the name sounds similar to EMA and EBA, but the molecular chain is MMA—methyl methacrylate. This monomer has the following characteristics: a wider processing temperature than EVA, better thermal stability, lower odor, and stronger adhesion to polar materials than ordinary PE.
Its processing performance is similar to LDPE, but it offers better softness and transparency. In the cable field, EMMA mainly produces modifiers for insulation layers and toughening components for sheaths, especially in applications requiring temperature resistance, low smoke, and non-corrosion. Films use it as a base material for matte films, while hot melt adhesives use it as a high-viscosity component.
The global landscape is interesting: Sumitomo Chemical was the first in the world to mass-produce EMMA commercially, with the grade ACRYFT. Other major manufacturers have their own layouts in the ethylene-acrylic copolymer family, but suppliers of pure EMMA grades are few and far between. This is a typical oligopoly category—not everyone can do it, but there are very few people doing it.
What exactly is a sub-brand, and what's the difference from recycled materials ?
Before discussing EMMA sub-brand, let's first clarify the concept of sub-brand. Sub-brand material is the grade of products from the same manufacturer and grade that does not fully meet the technical specifications of the genuine brand during factory inspection. Note, these are still original original polymer particles, with molecular structure identical to the genuine brand, but some indicators—melt index, hue, light transmittance, ash content—slightly deviated from the nominal values during inspection.
It's completely different from recycled or recycled materials. Recycled material is the processing of scraps and then pelletized, and has already undergone a thermal history; Recycled material is recycled plastic pelletizing with large performance fluctuations. What about the secondary brand? For the same batch of polymerized products from the original factory, those that qualify and bear the genuine label are sub-brands. The four main sources: starting and shutting down the plant from the start and tail materials, transition materials from grade changes, batches with slight exceedances due to process fluctuations, and secondary line tail materials. One thing to be especially careful about
EMMA secondary brands is: this category itself has few grades, and the circulation of secondary brands of the same grade is even smaller. Some products claiming to be EMMA sub-brands are actually disguised as EMA or EBA—the ester groups hanging on the molecular chain are different, so the adhesion and heat resistance of cable materials are much inferior. So when choosing EMMA sub-brands, first confirm whether they are original factory and original grades, then discuss the price.
Sumitomo Chemical: ACRYFT, the defining of the EMMA category
Sumitomo Chemical's ACRYFT is the pioneer of global commercial production of EMMA. The product line covers general-purpose grade, film grade, extrusion laminated grade, wire and cable grade, and hot melt adhesive grade, with MMA content from 5% to 32% covering the entire range. Cable grade grades include WH303-F, MMA content 18%, MFR 7, specifically targeting wire and cable applications.
ACRYFT is characterized by low odor and good heat resistance. Sumitomo Chemical's own information clearly states: "only manufactured by Sumitomo." This means that within the EMMA subcategory, Sumitomo Chemical is almost the only large-scale supplier. Its sub-brand material mainly comes from transition materials when switching device grades—from film level to cable grade, during the intermediate transition phase, MMA content and melt index fluctuate, but the molecular chain remains EMMA.
When choosing ACRYFT secondary brands, the key is MMA content and MFR. These two correspond to your cable process; slight fluctuations in other indicators generally do not affect usability. Packaging comes in large and small packages. Large packages are suitable for batch mixing in modification plants, while small packages are suitable for sample production and small batch testing.
Arkema: Lotryl, a veteran in ethylene-acrylic copolymers
Arkema's Lotryl series mainly focuses on EBA and EMA copolymers, but it has a very broad presence within the ethylene-acrylate family. Lotryl EBA covers low, medium, and high BA content, ranging from 17% to 35%; Lotryl EMA also has a complete product line. Although pure EMMA grades are not Arkema's main focus, its experience in high-pressure radical polymerization has earned its sub-brand material a solid reputation in the industry.
Arkema's sub-brand is characterized by good batch stability. It has facilities in France, North America, and Asia, and the transition material flows into the sub-brand channel during grade changes. Manufacturers specializing in cable modification use Arkema's ethylene-acrylic copolymer sub-brand as a toughening agent, blending it into PE insulation to improve low-temperature impact resistance and adhesion. Note: Arkema's Lotryl sub-brand must distinguish whether it is EBA or EMA—their softness and bonding temperature range differ; if the cable extrusion process is incorrect, the cable extrusion process must be heavily adjusted.
DuPont: Elvaloy, a veteran player in specialty copolymers
DuPont's Elvaloy series mainly produces ethylene-acrylate copolymers and ethylene ternary copolymers, mainly producing toughening and modifiers. Elvaloy often appears in PVC toughening, oil modification, and cable material formulations. DuPont has polymerization units in Louisiana, Belgium, and Singapore, with sub-brand materials mainly sourced from process fluctuation batches.
Elvaloy sub-brand is characterized by stable toughening performance. Manufacturers of cable sheaths use it as a toughening component for PE, raising low-temperature brittle temperature and tear resistance. DuPont's grade system is relatively mature, and sub-brand materials usually indicate deviation indicators—such as melting index being high or low, so you can select them at your own process window. But note that some grades in Elvaloy contain ternary monomers, which differ from pure EMMA processing temperature curves. Try small batches before machine use.
Choose EMMA secondary brands, avoid three pitfalls
First pitfall: using EMA or EBA to pass off as EMMA. This is the most common trick in this category. The three categories have similar names but different ester bases—EMA uses methyl acrylate, EBA uses butyl acrylate, EMMA uses methyl methacrylate. The adhesion, temperature resistance, and processing temperatures of cable materials all differ. When testing samples, first check the melt index and density, then use an infrared spectrum to confirm the ester type—don't just look at what the packaging says.
Second pitfall: No upper limit for melting index deviation. EMMA secondary brands may have melt fingers fluctuate from 0.3 to 450, a wide range. If your cable process window only matches MFR 2-7 grades, and a batch of MFR 20 sub-brands arrives, the extrusion pressure will be completely different, and the insulation layer wall thickness will go uncontrolled. Before receiving the goods, have suppliers report actual melt index measurements; don't just look at the label.
Third pitfall: Testing without leaving samples. The MMA content of EMMA sub-brand may fluctuate by 1-2 percentage points between batches. When making insulation material ratios, this fluctuation affects the dielectric performance of the final product. Leave 1 kg sample per batch and properly label the batch number; if problems arise, trace back.
Cologne warehouse stock | EMMA flexible
Main recommended brands: Sumitomo Chemical, Arkema, DuPont.
Main grades: ACRYFT (WH303-F), Lotryl, Elvaloy.
Packaging specifications: Small sub-brand and boxed sub-brand use small packaging; large package/ton packaging is sold per ton bag, packaged and stocked according to workshop usage.
Warehouse Stock: EMMA warehouse stock is usually 3000-6000 tons, including 500-800 tons for small sub-brand stock, 200-400 tons for containerized sub-brand, and 2500-4800 tons for large packages/ton packages.
Supply Guarantee: Direct procurement from the original factory, batch number with shipment.
Selection Mnemonics and a case from Lianyungang
Choosing EMMA off-brand, remember these five points:
1. Check the ester group. Using infrared to verify if it’s the main EMMA—don’t buy EMA thinking it’s EMMA.
2. Check the melt index. Only accept the shipment if the measured value falls within your process window.
3. Check MMA content. For insulation applications, match it to the required adhesion level.
4. Keep batch samples. Label samples from each batch so any issues can be traced back.
5. Packaging. Use large packaging for mass modification, and small packaging for trial samples and test runs.
There’s a customer in Lianyungang who produces low-voltage cable insulation material. They previously used genuine EMMA for superconducting sheath formulations but couldn’t reduce the material cost per ton. Later, they tested a batch of Sumitomo Chemical ACRYFT cable-grade off-brand. The measured melt index was 6.8 (nominal 7), MMA content 17.3% (nominal 18%)—both key indicators within allowable deviation. Trial production on the machine showed the insulation layer had embossed patterns without cracking. The extrusion temperature curve was almost the same as the genuine brand, and the material cost dropped over 1,000 per ton. After six months, yield stabilized above 98%.
EMMA off-brand is the slow-heating partner of the genuine brand—copolymerized with high-voltage radicals using the same process. Only the methyl ester content and melt index aren’t fully maximized at the factory, so it can’t produce high-gloss exterior components, but it works well for cable insulation and as a tackifier in hot-melt adhesives. Ningbo Cologne New Materials Co., Ltd. has been working for years on imported ethylene copolymer off-brands, sourcing from Sumitomo, Arkema, and DuPont, handling dozens of similar cases annually.
