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。
做半导体载具的、做医疗灭菌件的、做高频连接器的，谁没为PEI料纠结过？是正牌贵到一个载具肉疼？还是副牌买来热变形不对？或者把改性料当原树脂收了？
资料与数据来源
PW Consulting、Intel Market Research：Global Polyetherimide (PEI) Market 2026（SABIC ULTEM份额与产能口径）。
行业研报：2025—2026年中国聚醚酰亚胺(PEI)行业竞争格局分析报告。
SABIC、三菱化学先进材料(Duratron)、RTP Company官方产品资料。
Reconstruct 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 replied in one sentence, sending him back: "For the PEI category, 70-80% of the material worldwide comes from SABIC alone. The ‘other PEI’ you’re buying may very well just be SABIC’s ULTEM resin pelletized again."
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 added flame retardants, and has dimensional stability like it’s been precisely measured. Its glass transition is around 210 degrees, and for long-term service it can go up to 170 degrees and above. It’s transparent and can even allow microwaves to pass through. It’s in high demand for semiconductor carriers, medical sterilization parts, 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 the global landscape, by production capacity share, SABIC alone accounts for 70-80% of global PEI supply, with over one hundred ULTEM grades, making it the absolute leader. Other players rarely produce PEI raw resin from monomer polymerization themselves; most of them take ULTEM resin for modification, granulation, or making sheets and rods—for example, Mitsubishi Chemical Advanced Materials produces Duratron PEI, and RTP manufactures modified PEI, which in essence still uses SABIC's resin. So in the PEI industry, to be honest: the first-tier is dominated solely by SABIC ULTEM, while the second-tier is comprised of a group of companies that take its resin for downstream modifications. Oligopoly categories are written according to the actual tiers, not forced into a top-three ranking.
PEI sub-brand, not 'other people's PEI'
How do PEI sub-grades come about? For SABIC, the virgin pellets from the same grade and the same polymerization line have consistent molecular chains; it's just that during factory inspections, some indicators—MFI, transparency, and 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 tailings from parallel lines.
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 difference from recycled material: PEI has a very high processing temperature, and recycled material has already been overheated before, causing a drop in transparency and toughness; regenerated material is even more variable. Secondary brands use original factory 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 brand features a complete range of grades and strong certifications, with corresponding grades for semiconductors, medical, and aviation applications. A reminder: SABIC has facilities in Saudi Arabia, the United States, Spain, and Singapore. The secondary brand products from different origins circulate mixed together, so when purchasing, make sure to ask clearly about the origin and batch number, and don't mistake modified re-granulated products for original secondary brand products.
Mitsubishi Chemical Advanced Materials Duratron: Using ULTEM for sheets and rods
The second one is Mitsubishi Chemical Advanced Materials. It does not produce PEI resin from monomers itself, but uses SABIC's ULTEM resin to make 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 tighter dimensional tolerances, some 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 color batch variations.
For those making semiconductor carriers and connectors, RTP's modified PEI sub-brand offers good cost performance, but remember: it is a modifier, not an original resin manufacturer, and it's 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 injection molding requires high temperatures and careful control of barrel residence time. Secondary brands should also follow the process cards, and don'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 are for secondary brands, boxed secondary brands, large pack material/ton pack material are sorted by grade and stored according to batch quantity.
Warehouse stock: PEI secondary brand warehouse stock around 4000 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 check the TD value; third, check the cleanliness grade, semiconductor parts check for precipitates; fourth, for transparent parts measure haze, and for sight windows first check light transmission; fifth, follow the process card for drying and temperature control, do not slack off when processing at over 300 degrees.
Zhuzhou has a client specializing in semiconductor wafer carriers. Previously, non-SABIC genuine ULTEM was not used, and the cost of a typical carrier couldn't be reduced. Later, the secondary carrier parts that directly contact the wafer were replaced with secondary brands of the same grade. The thermal distortion temperature and dimensional stability were within the same range as genuine ones, and cleanliness was tested according to semiconductor requirements. The carrier cost was lower, but key components directly contacting wafers were still genuine.
This is the balance of PEI when choosing secondary brands—in SABIC's dominant category, controlling indicator fluctuations within suitable range saves money. The softening point of the same PEI secondary brand, Vicah, usually has a softening point within five degrees and a density tolerance of ±0.02. It and ULTEM genuine are virgin granules produced by the same anhydride-diamine polymerization formula. Ningbo Kelong New Materials Co., Ltd. has been doing imported PEI sub-brands for many years. The channels for ULTEM raw resin and downstream modified materials are stable, and they have handled many cases related to semiconductor carrier material selection.
Those making semiconductor carriers, medical sterilizers, or high-frequency connectors—who hasn't struggled with PEI materials? Is it that genuine brands are so expensive that a carrier is painful? Or is it that the secondary brand is bought and suffers from heat deformation? Or are modified materials accepted as base resins?
Information and data sources
PW Consulting, Intel Market Research: Global Polyetherimide (PEI) Market 2026 (SABIC ULTEM market share and capacity caliber).
Industry Research Report: 2025–2026 China Polyetherimide (PEI) Industry Competitive Landscape Analysis Report.
SABIC. Mitsubishi Chemical Advanced Materials (Duratron) and RTP Company Official Product Data
