还原一段对话。采购问：“这批PEI副牌，ULTEM的，能不能用在晶圆载具上？”工程师反问：“先问你两个数——维卡软化点多少？注塑温度多少？”采购愣住：“不都是PEI吗？”工程师一句话把他顶回去：“PEI这个品类，全球七八成的料都出自SABIC一家，你买的所谓‘别家PEI’，搞不好就是用SABIC的ULTEM树脂再造粒的。”
这段对话，每年在半导体材料采购群里要重演几十遍。PEI这东西，跟PEEK不一样——它不是三足鼎立，它几乎是一家独大。
PEI：透明、耐高温、阻燃不用加阻燃剂
PEI，聚醚酰亚胺，透明、耐高温、阻燃不用加阻燃剂、尺寸稳得像量过一样。玻璃化转变两百一十度上下，长期服役能到一百七十度往上，透明还能透微波，半导体载具、医疗灭菌件、航空内饰、5G高频连接器都抢。它的商业化学名背后站着一个传奇：PEI最早是GE塑料商业化的，后来GE塑料拆到了沙特基础工业(SABIC)旗下，ULTEM这个牌子就跟着到了SABIC手里。
全球格局，按产能份额口径，SABIC一家占了全球PEI供应的七八成，ULTEM牌号一百多个，是绝对的主力。其余玩家很少有自己从单体聚合做PEI原树脂的，大多是拿ULTEM树脂做改性、造粒、做板材棒材——比如三菱化学先进材料(Mitsubishi Chemical Advanced Materials)做的Duratron PEI，RTP公司的改性PEI，本质上用的还是SABIC的树脂。所以PEI这行，诚实的说法是：第一梯队SABIC ULTEM独大，第二梯队是一众拿它树脂做下游改性的厂。寡头品类按实际梯队写，不硬凑前三。
PEI副牌，不是“别家PEI”
PEI副牌怎么来的？SABIC同一牌号、同一条聚合线下来的原生粒子，分子链一致，只是出厂检验时个别指标——熔指、透明度、热变形温度——小幅偏出正牌内控线，走副牌。四大来源：开停车头尾料、切牌号过渡料、工艺波动致指标飘移批次、副线尾料。
这里有个特别要讲透的点：PEI副牌不是“别家PEI”。很多流通市场上所谓的“进口PEI副牌”，剥开来就是ULTEM的料，或者是拿ULTEM树脂改性后的副牌。跟回料的边界：PEI加工温度很高，回料已经过热历史，透明度和韧性都掉档；再生料波动更大。副牌是原厂原生粒。包装分大包装小包装。
SABIC ULTEM：从GE塑料到沙特，就是PEI的代名词
第一家，也是绕不开的一家，SABIC的ULTEM。从GE塑料到SABIC，ULTEM在PEI这个品类里就是“PEI”的代名词，牌号从纯树脂1000系列到玻纤增强、碳纤增强、阻燃改性全覆盖。
它的副牌特点是牌号全、认证厚，半导体、医疗、航空都有对应档。要提醒：SABIC在沙特、美国、西班牙、新加坡都有装置，不同产地的副牌流通混在一起，拿货要问清产地和批号，别把改性再造粒的货当原厂副牌收。
三菱化学先进材料Duratron：拿ULTEM做板材棒材
第二家，三菱化学先进材料。它不自己从单体做PEI树脂，而是拿SABIC的ULTEM树脂做标准板材、棒材，再机加工成半导体载具、医疗夹具。Duratron PEI这个牌子，在半导体载具圈子里口碑很稳。
它的“副牌”形态更接近标准件里的副品级板材——尺寸公差小一档、外观有瑕疵，但材料本体还是ULTEM。做半导体载具、测试治具的厂，认这条线。
RTP公司：改性造粒大厂，不是原树脂厂
第三家，美国RTP公司。RTP是改性造粒大厂，PEI也是拿ULTEM树脂做增强、润滑、导电改性，牌号覆盖半导体和电子领域。它的副牌更多体现在改性料的过渡批次——比如某档玻纤含量小幅偏、或颜色批次飘。
做半导体载具、连接器的，RTP的改性PEI副牌性价比不错，但要记住：它是改性厂，不是原树脂厂，跟SABIC不在一个层级上。
PEI副牌三个坑，别把改性料当原树脂
一是别把“改性PEI”当“原树脂PEI”，半导体高洁净件对金属离子、析出物有要求，改性料里的助剂会影响洁净度。二是热变形温度，PEI耐热窗口宽，但副牌某档热变形温度低了几度，做高温烘烤治具就变形。
三是透明度，做透明观察窗的PEI副牌，雾度差一点，透光就不过关。另外PEI注塑温度高、料筒停留要控制，副牌同样要按工艺卡，别因为料便宜就省干燥和控温。大包装适合量产载具，小包装适合打样。
科隆仓库现货｜PEI询价
主推品牌：SABIC、三菱化学先进材料、美国RTP公司
主要牌号：ULTEM、Duratron PEI
包装规格：原厂原包，分大包装与小包装两种；小包副牌、箱装副牌、大包料/吨包料分档码放，按批量备货
仓库现货：PEI副牌仓库现货4000吨上下
现货明细：小包副牌备货600-900吨、箱装副牌备货250-450吨、大包料/吨包料备货2650-3150吨
供应保障：检测单随货，出厂化验单随机同行，到货可对着单据复核
PEI副牌选料口诀
一看来源，PEI认ULTEM，改性厂和原树脂厂分清楚；二对热变形温度，高温治具卡TD值；三查洁净度等级，半导体件卡析出物；四要透明件测雾度，观察窗先过透光；五按工艺卡烘干控温，三百多度加工不偷懒。
株洲有家做半导体晶圆载具的客户，之前非SABIC正牌ULTEM不用，一块一般载具成本压不下来。后来把非晶圆直接接触的二级载具件换了同牌号副牌，热变形温度和尺寸稳定性跟正牌对在一个区间，洁净度按半导体要求验过，载具成本下来一截，直接接触晶圆的关键件仍走正牌。
这就是PEI选副牌的分寸——SABIC独大的品类里，把指标浮动控制在用途够用的范围，钱就省下来了。同牌号PEI副牌维卡软化点偏差常在五度以内、密度公差正负0.02，它和ULTEM正牌是同一套二酐二胺聚合配方出来的原生粒。宁波市科隆新材料有限公司做进口PEI副牌多年，ULTEM原树脂和下游改性料的渠道都稳，半导体载具选料的案子处理不少。
Restore a conversation. The purchaser asked: 'Can this batch of PEI off-brand, ULTEM, be used on wafer carriers?' The engineer countered: 'Let me ask you two numbers first—what is the Vicat softening point? What is the injection molding temperature?' The purchaser was stunned: 'Aren't they all PEI?' The engineer responded in one sentence: 'For this PEI category, 70 to 80 percent of the material worldwide comes from SABIC. The so-called 'other brand PEI' you bought might actually just be SABIC's ULTEM resin re-pelletized.'
This conversation repeats dozens of times every year in the semiconductor materials procurement group. PEI is different from PEEK—it is not one of the three major players; it is almost a monopoly.
PEI: Transparent, high-temperature resistant, flame-retardant without adding flame retardants
PEI, polyetherimide, is transparent, high-temperature resistant, flame retardant without needing additional flame retardants, and has dimensional stability like it’s been precisely measured. Its glass transition temperature is around 210 degrees Celsius, and it can be used long-term at temperatures above 170 degrees Celsius. It is transparent and can allow microwaves to pass through, making it in high demand for semiconductor carriers, medical sterilization components, aircraft interiors, and 5G high-frequency connectors. Behind its commercial chemical name stands a legend: PEI was first commercialized by GE Plastics, and later GE Plastics was acquired by Saudi Basic Industries (SABIC), bringing the ULTEM brand under SABIC’s ownership.
In terms of global capacity, SABIC alone accounts for 70-80% of global PEI supply, with over a hundred ULTEM grades, making it the absolute main force. Other players rarely produce PEI resin from monomer polymerization themselves; most use ULTEM resin for modification, pellubilization, and sheet and bar products—for example, Mitsubishi Chemical Advanced Materials produces Duratron PEI, and RTP's modified PEI essentially uses SABIC resin. So, to be honest, in the PEI industry: the first tier is SABIC ULTEM dominant, the second tier is many factories using its resin for downstream modification. Oligopoly categories are based on actual tiers, not forced into the top three.
PEI sub-brand, not 'other PEI'
How do PEI sub-grades come about? For SABIC, the virgin particles from the same grade and the same polymerization line have consistent molecular chains; it's just that during the factory inspection, a few indicators — melt index, transparency, heat distortion temperature — slightly deviate from the main grade's internal control limits, resulting in a sub-grade. There are four main sources: start-and-stop tailings, transitional material between grade changes, batches with indicator fluctuations caused by process variations, and side line tailings.
There's a particular point that needs to be explained clearly: a PEI secondary brand is not a 'PEI from another company.' Many so-called 'imported PEI secondary brands' on the market are actually made from ULTEM material or are secondary brands modified from ULTEM resin. Regarding the boundary with recycled material: PEI has a very high processing temperature, and recycled material has a history of overheating, which reduces transparency and toughness; recycled material is also more variable. Secondary brands are made from the original factory's virgin pellets. Packaging is available in both large and small sizes.
SABIC ULTEM: From GE Plastics to Saudi Arabia, it is synonymous with PEI
The first one, and also the unavoidable one, is SABIC's ULTEM. From GE Plastics to SABIC, ULTEM has become synonymous with 'PEI' in the PEI category, with grades covering everything from pure resin 1000 series to glass fiber reinforced, carbon fiber reinforced, and flame-retardant modified versions.
Its secondary brands are characterized by full grades, thick certifications, and corresponding standards for semiconductor, medical, and aerospace sectors. A reminder: SABIC has facilities in Saudi Arabia, the United States, Spain, and Singapore. Sub-brands from different origins are mixed together. When purchasing, be sure to check the origin and batch number. Do not accept modified and re-pelletized goods as original factory sub-brands.
Mitsubishi Chemical Advanced Materials Duratron: Using ULTEM for sheets and rods
The second one is Mitsubishi Chemical Advanced Materials. It does not make PEI resin from monomers itself, but uses SABIC's ULTEM resin to produce standard sheets and rods, which are then machined into semiconductor carriers and medical clamps. The Duratron PEI brand has a very solid reputation in the semiconductor carrier community.
Its 'secondary brand' form is closer to the sub-grade sheet in standard components — slightly looser dimensional tolerances, surface defects, but the material itself is still ULTEM. Semiconductor carrier and test fixture manufacturers recognize this line.
RTP Company: A major manufacturer of modified granules, not an original resin manufacturer
The third company, RTP in the United States. RTP is a major manufacturer of modified granules. For PEI, they also use ULTEM resin for enhancement, lubrication, and conductive modification, with grades covering the semiconductor and electronics fields. Its sub-brands are more reflected in transitional batches of modified materials — for example, slight deviations in glass fiber content for certain grades, or slight color variations between batches.
For those making semiconductor carriers and connectors, the modified PEI from RTP offers good cost-performance under its sub-brand, but remember: it is a modifier, not an original resin manufacturer, and is not on the same level as SABIC.
Three pitfalls of PEI secondary brands: don't confuse modified material with virgin resin
First, do not treat "modified PEI" as "virgin resin PEI." Semiconductor high-purity components have requirements for metal ions and leachables, and the additives in modified materials can affect cleanliness. Second, the heat deflection temperature: PEI has a wide heat resistance window, but some off-brand grades have a slightly lower heat deflection temperature, which can cause deformation when making high-temperature baking fixtures.
Third is transparency. For PEI secondary brands used for transparent observation windows, haze is a bit worse, and light transmission is not up to standard. In addition, PEI has a high injection molding temperature, and the barrel residence time needs to be controlled. Secondary brands also need to follow the process card, and you shouldn't skip drying and temperature control just because the material is cheap. Large packaging is suitable for mass production carriers, while small packaging is suitable for prototyping.
Cologne Warehouse Spot｜PEI Inquiry
Main recommended brands: SABIC, Mitsubishi Chemical Advanced Materials, RTP Company (USA)
Main grades: ULTEM, Duratron PEI
Packaging specifications: Original factory packaging, available in large and small packs; small packs of sub-brands, boxed sub-brands, large pack materials/ton bags are graded and stacked, stocked according to batch quantity.
Warehouse stock: PEI secondary brand warehouse stock around 4,000 tons
Spot details: Small package secondary brand stock 600-900 tons, boxed secondary brand stock 250-450 tons, large package/material per ton stock 2650-3150 tons
Supply Guarantee: Test sheet accompanies the goods, factory inspection certificate randomly sent with the goods, and it can be checked against the documents upon arrival.
PEI Secondary Brand Material Selection Mnemonic
First, check the source: PEI recognizes ULTEM, distinguish between the modifier factory and the original resin factory; second, check the heat deflection temperature, high-temperature fixtures lock the TD value; third, check the cleanliness grade, semiconductor parts lock on precipitates; fourth, for transparent parts measure haze, and viewing windows must first pass the light transmission test; fifth, control drying temperature according to the process card, and do not cut corners when processing at over 300 degrees.
There is a customer in Zhuzhou who makes semiconductor wafer carriers. Previously, they did not use non-SABIC genuine ULTEM, and the cost of a single standard carrier could not be reduced. Later, they replaced the secondary carrier parts that do not directly contact the wafer with the same grade of a sub-brand. The heat deflection temperature and dimensional stability are within the same range as the genuine brand, and cleanliness has been verified according to semiconductor requirements. The carrier cost was significantly reduced, while the critical parts that directly contact the wafer still use the genuine brand.
This is the measure for choosing a secondary brand of PEI — in categories dominated by SABIC, by keeping the property fluctuations within the range sufficient for use, money is saved. The Vicat softening point deviation of secondary brands with the same PEI grade is usually within five degrees, and the density tolerance is plus or minus 0.02. It is produced from the same dianhydride-diamine polymerization formula as genuine ULTEM resin. Ningbo Kolon New Materials Co., Ltd. has been making imported secondary PEI brands for many years, with stable channels for ULTEM virgin resin and downstream modified materials, and has handled quite a few semiconductor carrier material selection cases.
