Unsaturated Polyester Resin HS-2281SSK

HS-2281SSK is an industrial-grade unsaturated polyester resin formulated primarily from isophthalic acid and neopentyl glycol. The integration of isophthalic acid provides superior structural integrity and chemical resistance compared to standard orthophthalic alternatives. Meanwhile, the addition of neopentyl glycol significantly enhances the polymer matrix's water resistance, thermal stability, and overall weatherability, making it a reliable choice for demanding manufacturing requirements.

Designed specifically for Sheet Molding Compound (SMC) and Bulk Molding Compound (BMC) applications, this resin features a medium viscosity profile combined with high reactivity. This specific balance ensures optimal wet-out of fiberglass reinforcements during the compounding stage, which is critical for maintaining consistent batch-to-batch production. The precise SPI gel time (23-26 minutes) and cure time (25-28 minutes) offer a manageable processing window, allowing manufacturers to optimize production lines, reduce unnecessary downtime, and ensure thorough cross-linking of the material.

For procurement professionals and technical engineers, selecting the right chemical foundation is crucial for minimizing production defects and extending the lifespan of molded parts. HS-2281SSK is strictly formulated to maintain a consistent solid content of 58.5-61.5%, which directly correlates to predictable shrinkage rates and dimensional stability. Once fully cured, the material demonstrates outstanding mechanical strength, reliable electrical insulation properties, and notable heat resistance. These verified properties make the resin highly suitable for manufacturing electrical components, sanitary ware, and various industrial equipment, effectively reducing material failure risks for end products.

Specifications of Liquid Resin

The following technical parameters detail the liquid state properties of HS-2281SSK. The controlled viscosity (1000-1500 mPa.s) and specific acid value (12-15 mg KOH/g) are engineered to provide stable handling and processing characteristics during SMC/BMC formulation. The light yellow, slightly turbid liquid appearance is standard for this specific formulation, ensuring it can be easily pigmented or filled according to project requirements.

Curing system in SPI test: BPO paste 2%.

Physical Properties of Casting (For Reference Only)

The mechanical and thermal data below reflect the performance of the cured resin casting. With a Heat Deflection Temperature (HDT) of 120℃ and a flexural strength of 115 MPa, the material provides the necessary rigidity and thermal endurance for demanding structural applications.

Note:

1) The casting is made according to GB/T8237; Curing System: Accelerator 0.6% Co-Naph: 2.0% ; Hardener AKZO M-50: 2%；

2) Post curing: RT×24hrs+60℃×3hrs+110℃×2hrs

Proven Applications in Composite Manufacturing

The Unsaturated Polyester Resin HS-2281SSK is engineered to deliver reliable performance across a variety of demanding manufacturing sectors. Designed specifically for composite molding applications, this resin provides an optimal balance of mechanical strength, good surface finish, and dependable processing characteristics. For manufacturers seeking a versatile material that ensures consistent output in mass production, HS-2281SSK serves as a foundational component. It is highly suitable for producing durable end-products in the fields of electrical components, sanitary ware, and industrial equipment. By integrating this resin into your production line, you can achieve better structural integrity, reduce maintenance requirements for the final products, and improve overall manufacturing efficiency.

Sanitary Wares

When applied in the production of sanitary wares such as sinks, bathtubs, and shower trays, the HS-2281SSK unsaturated polyester resin offers distinct advantages. Manufacturers in the kitchen and bathroom industry require materials that can provide a smooth, glossy surface finish while maintaining long-term resistance to water, stains, and daily wear. This resin ensures dependable moldability, allowing for the creation of complex and ergonomic designs without compromising structural stability. Furthermore, its consistent curing properties help reduce surface defects during the molding process, thereby increasing the yield rate of sanitary products. The resulting composite parts exhibit strong durability, resisting cracking and discoloration over time, which significantly enhances the end-user experience and brand reputation for sanitary ware manufacturers.

Industrial Ventilators

In the manufacturing of industrial ventilators and exhaust systems, material strength and environmental resistance are critical. The HS-2281SSK resin is highly suitable for fabricating ventilator housings, fan blades, and structural components that are constantly exposed to harsh industrial environments. By utilizing this resin, manufacturers can produce lightweight yet structurally robust composite parts that withstand high-speed rotation and continuous vibration. Additionally, the resin provides reliable resistance to mild corrosive elements and industrial fumes, ensuring the long-term operational stability of the ventilation equipment. Its strong mechanical properties help prevent deformation under stress, reducing the need for frequent maintenance and replacement. This makes it a cost-effective and dependable choice for industrial equipment fabricators aiming to build stable air management systems.

Electrical Box

For electrical components and outdoor electrical boxes (such as meter boxes), safety and protection against environmental factors are top priorities. The HS-2281SSK unsaturated polyester resin is formulated to support the rigorous requirements of the electrical manufacturing sector. It offers reliable electrical insulation properties, effectively protecting sensitive internal components from short circuits and electrical interference. When used in SMC (Sheet Molding Compound) processes for electrical enclosures, this resin contributes to strong dimensional stability and weather resistance. It ensures that the outdoor meter boxes can endure extreme temperature fluctuations, UV exposure, and moisture without degrading or becoming brittle. By choosing this resin, electrical equipment manufacturers can deliver enclosures that meet strict safety standards, ensuring long-lasting protection for critical power distribution infrastructure.

Whether you are molding bathroom fixtures, engineering heavy-duty industrial fans, or producing secure electrical enclosures, the HS-2281SSK unsaturated polyester resin provides the consistency and performance required for modern composite manufacturing. Its adaptability to various molding techniques makes it a valuable asset for optimizing production workflows and enhancing product value.