说个行业里的鄙视链：做包装泡沫的看不起做建材板的，做建材板的看不起那些"什么EPS珠粒都敢发"的贸易商。最后发现，贸易商手里的EPS，标号写着"可发性珠粒"，发珠倍率忽高忽低，成型出来的泡沫密度不均，要么偏软掉渣、要么偏硬超重。EPS这东西，倍率和密度差一档，包装和建材就是两个价。副牌能不能用，先看是谁家的珠粒。
结论先说：EPS副牌能用，但发珠倍率和密度必须和制品对上，做包装泡沫先核倍率，做建材板先核密度。今天把无锡兴达泡塑、江阴丽天、蓝山屯河这几家国产EPS企业的副牌门道，一次讲透。
EPS是什么？国内产能谁在领跑
EPS是可发性聚苯乙烯，在聚苯乙烯珠粒里预浸发泡剂，加热发珠后模塑成型，轻质、保温、缓冲，大量用于家电包装、建筑保温板、一次性餐具、园艺插花、防震填充。它分普通包装级、阻燃级、低密度板级，发珠倍率和密度是核心参数。
国内EPS产能主要集中在江苏、山东、广东沿海。无锡兴达泡塑是行业龙头，"锡发牌"EPS国内市占约四成多，生产规模居全球前列，在无锡、常州、惠州、新疆、大庆、安庆、山东建有多个生产基地；蓝山屯河在新疆克拉玛依，EPS产能约十二万吨，依托当地苯乙烯资源；江阴丽天是江苏区域型EPS生产厂家，服务长三角包装和建材市场。此外珠海见龙、宁波见龙、东莞新长桥也是重要产能方。
EPS副牌：发珠倍率和密度是两道闸门
EPS副牌，是原厂同一牌号体系里检验指标小幅偏离的批次。落到EPS上，副牌最常见的差异点集中在四项：发珠倍率波动、密度不均、发泡剂含量偏差、珠粒粒径偏粗。
为什么这几项关键？EPS靠发珠倍率定密度，倍率高了泡沫软、强度低，倍率低了硬、偏重；密度不均，成型出来的包装件一边实一边空。家电包装要缓冲，建材板要保温，对密度窗口要求不同。买EPS副牌，先问清倍率和密度是哪个档。
和回料的区别：EPS回料是泡沫边角、包装废品破碎再生，珠粒已经发过一次泡，二次发珠倍率和强度差；EPS副牌是原厂原生可发珠粒，只是倍率或密度小幅偏离。做家电包装，用副牌是"倍率够不够"的问题，用回料是"缓冲掉不掉"的问题。
无锡兴达泡塑：国产EPS规模龙头
兴达泡塑在江苏无锡，是国内EPS行业龙头，"锡发牌"EPS国内市占约四成多，生产规模居全球前列，多基地布局，产品畅销全国并出口六十多个国家，在包装、建材、装饰领域口碑深厚。
兴达副牌料的特点是：行业龙头，批次管理规范，倍率和密度记录齐全；包装级、阻燃级、板级牌号齐全；副牌以倍率和色相小幅偏离为主，适合家电包装、缓冲件、一般建材板。阻燃认证件和出口食品级仍建议正牌。
适用场景：家电缓冲包装、建筑保温板、一次性制品、防震填充。
蓝山屯河：新疆苯乙烯一体化路线
蓝山屯河在新疆克拉玛依，依托当地苯乙烯和芳烃资源，EPS产能约十二万吨，走苯乙烯-EP一体化路线，成本有优势，产品供应西北、华北并出口中亚。
蓝山屯河副牌料的特点是：原料自供带来成本竞争力，副牌价格有吸引力；以包装级和板级为主；西北基地到华东运距长，适合批量大、不赶急单的建材板和包装件。
适用场景：建筑保温板、家电包装、防震填充、一般模塑件。
江阴丽天：长三角区域型厂家
江阴丽天是江苏区域型EPS生产厂家，地处长三角塑料产业带，服务周边家电包装和建材市场，产品以通用EPS珠粒为主。
丽天副牌料的特点是：区位贴近长三角包装和建材客户，交货快；以通用包装级和板级为主；副牌批次建议逐批确认倍率和密度，适合周边包装厂和板厂小批量掺配。采购时建议直接对接厂家核验批次和检测单。
适用场景：家电缓冲包装、建筑保温板、防震填充、一般模塑件。
EPS副牌避坑指南
第一，倍率和密度先对上。家电包装要缓冲密度，建材板要保温密度，拿错倍率，成型件要么软要么重。
第二，阻燃级要认准。有阻燃要求的建筑保温板，必须用阻燃级EPS并保留阻燃检测，别拿普通副牌混。
第三，珠粒粒径要匀。粒径不均的副牌发珠后密度差大，成型件表面不平。
第四，出口和食品接触件别用副牌。出口包装和食品接触一次性制品必须正牌并保留认证，副牌只用于国内一般包装和建材。
科隆仓库现货｜国产EPS泡沫颗粒常备
科隆在宁波仓库常备国产EPS副牌现货，主推品牌覆盖无锡兴达泡塑、蓝山屯河、江阴丽天等国内EPS头部企业。主要牌号涵盖包装级、阻燃级、板级多个倍率档，包装分大包装与小包装两种，不同倍率和密度分仓码放。
仓库现货通常在3000-6000吨：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。
供应保障走原厂原包直采：科隆与EPS头部企业渠道直接对接，副牌珠粒保留原厂原包标识，不拆包不混批；客户报制品用途和密度要求，科隆从原包批次里匹配现货，倍率和密度随货可查。
选型口诀与案例
国产EPS副牌怎么选？记住四句话：倍率密度先对上，阻燃件认准阻燃级，粒径要匀，出口食品件不碰副牌。
武汉一家大家电配套包装厂，原来一直用兴达EPS正牌做空调缓冲包装，每吨成本偏高。今年改用科隆供的蓝山屯河EPS副牌包装级，到货先测发珠倍率和密度在缓冲窗口，批量成型后包装件缓冲和外观都达标，成品通过跌落测试，每吨原料成本降了近一千元。老板说：空调包装又不是建材阻燃板，倍率对、密度稳，国产副牌完全顶得上。
Let me talk about the industry's hierarchy: those who make packaging foam look down on those who make building material boards, and those who make building material boards look down on traders who "dare to ship any EPS beads." In the end, I found that the EPS in traders' hands labeled "expandable beads" has a bulging bead ratio, and the foam density is uneven—either softer and crumby, or harder and overweight. EPS has a whole different ratio and density; packaging and building materials are two different prices. Whether a secondary brand can be used depends first on whose beads it is.
Conclusion First: EPS secondary brands can be used, but the bead ratio and density must match the product. For packaging foam, check the ratio first; for building material boards, check density. Today, let's thoroughly explain the secrets behind the sub-brands of several domestic EPS companies: Wuxi Xingda Foam Plastics, Jiangyin Litian, and Lanshantunhe. What is
EPS? Who leads domestic production capacity
EPS is expandable polystyrene, which pre-impregnates polystyrene beads, heats the spout beads to mold them, and is lightweight, insulating, and cushioning. It is widely used in home appliance packaging, building insulation boards, disposable tableware, horticultural flower arranging, and shockproof filling. It is divided into ordinary packaging grade, flame-retardant grade, and low-density board grade, with bead sprouting rate and density as core parameters.
Domestic EPS capacity is mainly concentrated in the coastal areas of Jiangsu, Shandong, and Guangdong. Wuxi Xingda Foam Plastics is the industry leader, with "Xifa brand" EPS accounting for over 40% of the domestic market and ranking among the world's leading producers, with multiple production bases in Wuxi, Changzhou, Huizhou, Xinjiang, Daqing, Anqing, and Shandong; Lanshantunhe in Karamay, Xinjiang, has an EPS capacity of about 120,000 tons, relying on local styrene resources; Jiangyin Litian is a regional EPS manufacturer in Jiangsu, serving the packaging and building materials markets of the Yangtze River Delta. Additionally, Zhuhai Jianlong, Ningbo Jianlong, and Dongguan Xinchangqiao are also important production capacities.
EPS sub-brand: Bead multiplicity and density are two gates
EPS sub-brands, representing batches with slight deviations in inspection indicators within the same grade system of the original factory. For EPS, the most common differences for secondary brands are concentrated in four areas: bead multiplier fluctuation, uneven density, deviation in foaming agent content, and coarse bead size.
Why are these key points? EPS determines density based on bead splitting: higher ratios make foam softer and weaker, lower density; lower ratios make it hard and heavier; Uneven density means molded packaging parts are solid on one side and hollow on the other. Home appliance packaging needs cushioning, building material boards need insulation, and different density window requirements differ. When buying EPS secondary brands, first ask which rating and density are set.
Difference from recycled material: EPS recycled material consists of foam edges and packaging waste broken and recycled; beads have already foamed once and secondary bead release rates and strength are poor; EPS sub-brand is the original factory's original sprouting bead granules, with only slight deviations in rate or density. In home appliance packaging, using sub-brands is a matter of "sufficient magnification," while using recycled material is a matter of "buffering or not removing."
Wuxi Xingda Bubble Plastics: Leading domestic EPS scale
Xingda Bubble Plastic is a leader in the domestic EPS industry in Wuxi, Jiangsu. The "tin brand" holds over 40% of the domestic EPS market, with production scale among the top globally, multiple bases established, products sold nationwide and exported to over sixty countries, and a strong reputation in packaging, building materials, and decoration.
Xingda sub-brand materials are characterized by industry leadership, standardized batch management, complete records of ratio and density; complete packaging grade, flame retardant grade, and board grade range; Secondary brands mainly have minor deviations in magnification and hue, suitable for home appliance packaging, cushioning parts, and general building material boards. Flame-retardant certified parts and export food-grade parts are still recommended for genuine brands.
Applicable scenarios: home appliance cushioning packaging, building insulation boards, disposable products, shockproof filling.
Lanshantunhe: Xinjiang styrene integrated route
Lanshantunhe in Karamay, Xinjiang, relying on local styrene and aromatic resources, EPS production capacity about 120,000 tons, following an integrated styrene-EP route, cost-advantage, supplying Northwest and North China and exporting to Central Asia.
Lanshantunhe's sub-brand material features are: self-supplied raw materials for cost competitiveness, sub-brand prices attractive; Mainly packaging-grade and board-grade; Long transportation distance from the Northwest base to East China, suitable for large batches and building material boards and packaging parts that do not require urgent orders.
Applicable scenarios: building insulation boards, home appliance packaging, shockproof filling, general molded parts.
Jiangyin Litian: Yangtze River Delta regional manufacturer
Jiangyin Litian is a regional EPS manufacturer in Jiangsu, located in the Yangtze River Delta plastic industry belt, serving the surrounding home appliance packaging and building materials markets, mainly producing general EPS beads.
Litian's sub-brand materials are characterized by: close to Yangtze River Delta packaging and building materials customers, fast delivery; Mainly general packaging and board grade; For sub-brand batches, it is recommended to confirm the ratio and density batch by batch, suitable for small-batch blending at surrounding packaging and board factories. When purchasing, it is recommended to directly connect with the manufacturer for batch verification and inspection reports.
Applicable scenarios: home appliance cushioning packaging, building insulation boards, shockproof filling, general molded parts.
EPS secondary brand pitfall guide
First, match the ratio and density first. Appliance packaging should buffer density, building material boards should have insulation density; if the magnification is incorrect, the molded parts will either be soft or heavy.
Second, the flame-retardant grade must be recognized. Building insulation boards with flame-retardant requirements must use flame-retardant grade EPS and retain flame retardant testing; do not mix with ordinary sub-brands.
Third, bead size should be uniform. If the bead size is uneven, the density difference after bead release is large, causing the surface of the molded part to be uneven.
Fourth, export and food contact items must not use secondary brands. Disposable products for export packaging and food contact must be certified as genuine and retained; secondary brands are only used for general domestic packaging and building materials.
Cologne warehouse stock | Domestic EPS foam pellets are always in stock
Cologne maintains domestic EPS sub-brand stock at the Ningbo warehouse, with main brands covering leading domestic EPS companies such as Wuxi Xingda Foam, Lanshan Tunhe, and Jiangyin Litian. Main grades cover packaging, flame-retardant, and board grades, with packaging divided into large and small packaging, and different densities are stacked separately.
Warehouse stock is usually between 3000-6000 tons: small sub-brand stocks 500-800 tons, boxed sub-brand stocks 200-400 tons, large packages/ton stocks 2500-4800 tons.
Supply Guarantee Follows Original Factory Original Package Direct Procurement: Cologne directly connects channels with leading EPS companies, sub-brand beads retain original factory package markings, no unpacking or mixed batches; Customers report product usage and density requirements, Cologne matches stock from original package batches, with rate and density checked according to stock.
Selection Mnemonics and Case Studies
How to Choose Domestic EPS Sub-Brand? Remember these four points: first match the rate and density, choose flame-retardant parts with uniform particle size, and avoid touching secondary brands for exported food parts.
A major home appliance packaging factory in Wuhan used to use genuine Xingda EPS for air conditioner buffer packaging, with a relatively high cost per ton. This year, they switched to using Lanshan Tunhe EPS sub-brand packaging grade supplied by Cologne. Upon arrival, the bead release rate and density were tested within the buffer window. After mass forming, the packaging parts met buffering and appearance standards, and the finished product passed drop tests, reducing raw material costs by nearly 1,000 yuan per ton. The boss said: Air conditioning packaging is not a building material flame-retardant board; the ratio is correct and density stable. Domestic sub-brands can fully compete
