天津一家做电气绝缘件的采购算了笔账：进口PSU正牌一吨要四五万，回料不敢往绝缘件上用，中间那段“副牌”又怕踩雷，三年下来光试错成本就压了不少。其实国产聚砜这两年已经起来了，把账算明白，副牌不是不能用，是得用对地方。国产PSU这条线，广东优巨新材是绕不开的一家。
PSU是什么，国产格局
PSU是聚砜（双酚A型聚砜），琥珀色透明，长期耐温约150度，耐水解、电绝缘、刚性好，电气绝缘件、食品接触盘、水处理膜支撑、汽车热件里用。全球PSU原本由索尔维世索科Udel等主导。国内这头，优巨新材率先开发聚芳醚砜PPSU、PES、PSU全系列，是国内唯一万吨级聚砜产能企业，2025年聚砜产能达1.5万吨/年并实现上下游配套，PSU是其全系列中的通用级主力。金发科技、山东浩然特塑等同步配套聚砜树脂和改性制品。论PSU规模化和全系列供应，优巨新材是国内这条线上的头部。下游看，电气绝缘和食品接触件占PSU消费大头，水处理和汽车是延伸方向。这两年新能源汽车三电和储能绝缘件在拉PSU需求，国内聚砜产能从2022到2025年快速放量，PSU副牌的流通量也跟着水涨船高。
PSU副牌从哪来，和PPSU、回料怎么分
PSU副牌来自聚合装置开停车料、牌号切换过渡料、工艺波动致熔融指数或粘度小幅偏离的批次。它仍是原厂原生PSU粒子，耐水解和电绝缘骨架与正牌一致，个别指标小幅浮动，不是回料。要把PSU副牌和回料分清：回料已受过一次热历史，介电性能和耐水解都不稳；原厂副牌是一次聚合产物。别拿回料当PSU副牌往电气绝缘件上用。PSU副牌按熔融指数和玻纤增强比例分档，电气件对介电和灰分敏感，进厂要测介电和灰分。副牌按纯树脂和加纤分档，价目和用途都不同，下单前先和供方把这一档位问清楚。
头部企业深度分述：优巨新材
优巨新材是国内聚砜领域少有的从关键单体到树脂一体化的企业，Paryls聚砜系列覆盖PPSU、PES、PSU。它在PSU上的特点是全系列同时大规模供应，PSU作为通用级聚砜，面向电气绝缘、食品接触和水处理支撑件。其副牌多来自聚合开停车和牌号切换，熔指略飘、色相略深，但电绝缘和耐水解骨架与正牌同体系。对一般电气绝缘件、非认证食品接触件、水处理结构件，副牌替代进口PSU的成本账很划算。第二梯队里，金发科技和山东浩然特塑在聚砜方向有产能，优巨新材湖北基地投产两年产值翻番、产能快速爬坡，全系列万吨级仍以优巨为代表，仅作行业背景。把账算开：进口PSU正牌每吨四万往上，国产优巨PSU正牌已下探一截，副牌再低一档，对用量大、又非认证件的电气绝缘厂来说，一年下来材料费能压出一块可观的空间，前提是料要原厂原包、指标要逐批核对。
PSU副牌选购避坑
第一，测介电和灰分。PSU用于电气绝缘件，副牌也要核对介电常数和介质损耗，灰分影响绝缘。第二，原厂原包直采，聚砜单价高、换包掺假风险大。第三，耐水解，食品接触和水处理件要测浸水后强度保持率。第四，干燥，PSU吸潮，注塑前充分干燥。第五，对牌号，玻纤增强PSU测灰分确认玻纤含量，偏差影响刚性和翘曲。另外PSU加工温度高，熔体粘度大，副牌按推荐温度和背压试机，缺压会充模不全。电气件对表面光洁度要求高，副牌色相略深有差异时，用于深色或非外观件。采购时还要问清是纯树脂副牌还是加纤副牌，两者价差和用途都不同，别拿加纤料当纯树脂报价下单。PSU价格随双酚A原料波动，签长单时建议锁价并在合同里写清熔指和灰分的验收上下限，省得到货扯皮。
科隆仓库现货
科隆仓库现货主推品牌：优巨新材Paryls® PSU聚砜副牌料。主要牌号：电气绝缘件、食品接触盘、水处理支撑件用通用聚砜专用料。包装规格：小包装与大包装（吨袋）均有备货。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，从工厂直发入库，中间不倒手，每批带出厂检测与批号。电气绝缘、食品接触、水处理客户可报制品类型询价。
选型口诀与案例
国产PSU副牌选料三句话：介电灰分先测，原包直采防掺，外观件走正牌。
A Tianjin company doing electrical insulation parts did the math: imported PSUs cost forty to fifty thousand per ton, and they don't dare to use recycled materials on insulating parts. The middle "secondary brand" section fears landing on landmines, so over three years just the cost of trial and error has been significantly reduced. Actually, domestic polysulfone has already risen in the past two years. If you do the math, it's not that secondary brands can't be used, but they must be used in the right places. In the domestic PSU line, Guangdong Youju New Materials is an indispensable company. What is
PSU? The domestic
PSU is polysulfone (BPA type polysulfone), amber transparent in color, long-term temperature resistant to about 150 degrees, hydrolysis-resistant, electrically insulating, and rigid. Used in electrical insulators, food contact plates, water treatment film supports, and automotive heat parts. Global PSUs were originally dominated by Solvais Soco Udel and others. Domestically, Youju New Materials took the lead in developing a full range of polyarylethyl sulfone PPSU, PES, and PSUs, making it the only domestic company with a 10,000-ton polysulfone capacity. By 2025, polysulfone capacity will reach 15,000 tons per year and achieve upstream and downstream support, with PSUs being the general-purpose main force in its entire series. Kingfa Technology, Shandong Haoran Special Plastics, and others are simultaneously supplying polysulfone resin and modified products. In terms of PSU scale and full supply, Youju New Materials leads domestic production. Downstream, electrical insulation and food contact parts account for the majority of PSU consumption, while water treatment and automotive are the main directions. In recent years, new energy vehicle electric and energy storage insulating parts have driven PSU demand, with domestic polysulfone capacity rapidly increasing from 2022 to 2025, and the circulation volume of PSU sub-brands has also risen. Where does the
PSU secondary plate come from, and how to distinguish between PPSU and recycled material
PSU The secondary plate comes from the start-stop material of the polymerization unit, the transition material for grade changes, or batches where process fluctuations cause slight deviations in melt index or viscosity. They are still original PSU particles from the original factory, with a hydrolysis resistance and electrical insulation framework consistent with the genuine brand, with some indicators fluctuating slightly, not recycled materials. Distinguish between the PSU secondary brand and the return material: the return material has already undergone one one thermal history, so both dielectric performance and hydrolysis resistance are unstable; The original secondary brand is a primary polymerization product. Do not use recycled material as a PSU secondary plate for electrical insulation components. PSU secondary cards are classified by melt index and glass fiber reinforcement ratio; electrical components are sensitive to dielectric and ash content, so dielectric and ash content must be measured before entering the factory. Secondary brands are divided into pure resin and fiber grades, with different prices and uses. Before placing an order, please clarify this tier with the supplier.
In-depth Discussion of Leading Companies: Youju New Materials
Youju New Materials is one of the few domestic companies in the polysulfone field that integrates from key monomers to resins. Paryls polysulfone series covers PPSU, PES, and PSU. Its PSU feature is large-scale simultaneous supply across the entire series. As general-grade polysulfone, PSUs target electrical insulation, food contact, and water treatment support parts. Its sub-brands mostly come from polymer start-stop and grade switching; the melt fingers are slightly flushed and the hue slightly darker, but the electrical insulation and hydrolysis-resistant framework are the same system as the genuine brand. For general electrical insulation parts, non-certified food contact parts, and water treatment structural parts, the sub-brand is very cost-effective to replace imported PSUs. In the second tier, Kingfa Technology and Shandong Haoran Special Plastics have capacity in the polysulfone sector. Youju New Materials' Hubei base doubled output value and rapidly ramped up capacity after two years of operation. The entire series of 10,000-ton products is still represented by Youju, just for industry background. Let's break the score: imported PSUs are priced above 40,000 yuan per ton, while domestic Youju PSUs have already dropped a bit, with secondary brands lower. For electrical insulation factories with large usage volumes and non-certified parts, material costs can add up a considerable margin over the year, provided the materials are original and the specifications must be checked batch by batch.
PSU Avoid pitfalls when selecting secondary brands
First, measure dielectric and ash content. PSUs are used for electrical insulation, and secondary brands also need to check dielectric constant and dielectric loss, as ash affects insulation. Second, direct procurement from the original factory and packaging, with high polysulfone unit price and high risk of adulteration when repackaging. Third, resistance to hydrolysis; for food contact and water treatment parts, measure strength retention after immersion. Fourth, drying: PSU absorbs moisture and is thoroughly dried before injection molding. Fifth, for grades, measure the ash content of glass fiber reinforced PSUs to confirm glass fiber content; deviation affects rigidity and warping. Additionally, PSUs have high processing temperatures and high melt viscosity; secondary brands test machines with recommended temperature and back pressure; insufficient pressure will result in incomplete mold filling. Electrical parts require high surface finish, and if the secondary brand has slightly deeper hue, it is used for darker or non-appearance parts. When purchasing, also ask whether the secondary brand is pure resin or fiber-reinforced sub-brand, as the price difference and uses differ. Do not quote and order with fiber-reinforced material as pure resin. PSU prices fluctuate with BPA raw materials. When signing long-term orders, it is recommended to lock the price and specify the acceptance limits for melting fingers and ash content in the contract to avoid disputes over goods when you get the goods.
Cologne Warehouse Stock
Cologne Warehouse Stock Main recommended brands: Youju New Materials Paryls® PSU polysulfone sub-brand materials. Main grades: General polysulfone specialty materials for electrical insulation parts, food contact pans, and water treatment support parts. Packaging specifications: Both small and large packages (ton bags) are stocked. Warehouse stock is usually between 3000-6000 tons, with small secondary brands stocked at 500-800 tons, sub-brand containerized stocks at 200-400 tons, and large packages/ton stocks at 2500-4800 tons. Supply guarantee: Direct sourcing from the original factory and packaging, shipped directly from the factory to warehouse, no handover in between, each batch comes with factory inspection and batch number. Customers in electrical insulation, food contact, and water treatment can request product type quotes.
Selection tips and case studies
Domestic PSU sub-brand material selection Three sentences: dielectric ash content test first, original packaging direct mining prevents adulteration, appearance parts follow genuine brands
