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Unsaturated Polyester Resin
Molding Resin

Low Shrinkage SMC BMC Resin for Automotive

Low Shrinkage SMC BMC Resin for Automotive
Unsaturated Polyester Resin for SMC
thumb Low Shrinkage SMC BMC Resin for Automotive
Unsaturated Polyester Resin for SMC
Low Shrinkage SMC BMC Resin for Automotive

This product is a specialized unsaturated polyester resin for SMC/BMC molding, specifically designed for sheet molding compound (SMC) and bulk molding compound (BMC) formulations. It features medium to high viscosity, high reactivity, rapid curing, and stable molding, making it suitable for high-strength molded products such as automotive parts, electrical insulation, mechanical enclosures, and sanitary ware.


High Reactivity

Low Shrinkage

High Mechanical Strength

Good Heat Resistance

Excellent Electrical Properties

Model:PLM-125
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Low Shrinkage SMC BMC Resin Overview

PLM-125 by POLEMA is a professional-grade high reactivity SMC BMC resin specifically designed for sheet molding compound and bulk molding compound formulations. As a leading manufacturer, we deliver this advanced SMC BMC resin with low shrinkage and rapid curing to optimize efficiency for global compression molding production lines.

SMC & BMC Unsaturated Polyester Resin Core Performance Advantages

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High Reactivity and Rapid Curing

Enables high-efficiency compression molding, making it ideal for large-scale automated production.

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Low Shrinkage and Dimensional Precision

Finished products remain free from deformation or warping, exhibiting excellent dimensional stability.

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Superior Mechanical Properties

Possesses high strength, excellent rigidity, and strong impact resistance, ensuring long-term reliability in use.

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Excellent Heat Resistance and Electrical Insulation

Withstands high temperatures and offers robust electrical insulation, making it highly suitable for electrical and automotive components.

SMC & BMC Unsaturated Polyester Resin Specifications

PropertyRangeUnitTest Standard
AppearancePale Yellow Transparent—GB/T8237
Viscosity (25°C)1200-1800mPa·sGB/T7193
Acid Value18-24mgKOH/gGB/T2895
Solid Content58-64%GB/T7193
Gel Time (80°C)6.5-10.5minutesGB/T7193

*1.0g BPO paste added to 100g resin.

SMC & BMC Unsaturated Polyester Resin Cured Resin Properties (Typical Values)

PropertyValueUnitTest Standard
Tensile Strength60MPaGB/T2567
Tensile Modulus3200MPaGB/T2567
Elongation at Break3.0%GB/T2567
Flexural Strength100MPaGB/T2567
Flexural Modulus3300MPaGB/T2567
Impact Strength7.0KJ/m²GB/T2567
Heat Deflection Temperature110°CGB/T 1634
Barcol Hardness45-GB/T 3854

*Curing Conditions:Cure at room temperature for 24 hours,post-cure at 40°C,60°C and 120°C for 2 hours each.
Test Conditions: Temperature 23±2°C, Relative Humidity 50±6%.

Liquid Resin Properties (Typical Values)

PropertyValueUnitTest Standard
Shelf Life (Uninitiated, Dark)3Months-

SMC & BMC Unsaturated Polyester Resin Application

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Automotive Components


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Electrical Insulation


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Mechanical Enclosures


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Sanitary Ware


FAQ

Why do some SMC and BMC products exhibit color mottling?
Color mottling in SMC/BMC products stems primarily from five core issues: poor pigment dispersion, phase separation, uneven flow/temperature distribution, non-uniform distribution of fibers/fillers, and the migration of low-shrinkage additives. This phenomenon is particularly prone to occurring in light-colored or vivid shades (such as fruit green, light red, and light gray).
Mottling is the cumulative result of multiple interacting factors involving materials, processing parameters, and equipment. To address this, priority should be given to troubleshooting four key areas: color paste quality, LPA phase separation, mold temperature uniformity, and the thickening/maturation process. By combining this diagnostic approach with process optimization, color uniformity can be significantly improved.
Why do SMC and BMC materials tend to "flow" or sag during the summer?
The high temperatures and high humidity characteristic of summer directly disrupt the thickening system, the viscosity of the material sheet, and the equilibrium of the curing reaction. This is a common industry-wide issue; both BMC bulk molding compounds and SMC sheet molding compounds become significantly more susceptible to sagging, excessive flash during compression molding, drooping at edges and corners, and material leakage during mold closure.
By implementing appropriate measures—specifically reinforcing the thickening system for summer conditions, storing materials at low temperatures, and shortening the maturation period—issues related to material flow, overflow, and sagging can be completely resolved.

Instructions for Use and Storage Conditions
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Due to high temperatures in summer,please add an appropriate amount of inhibitor during use to ensure the storage stability of BMC.
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Transportation shall comply with the provisions of Chapter V of the Regulations on the Safety Administration of Hazardous Chemicals issued by the State Council.
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Before use,the resin should be stored in its original packaging (avoid opening and damage to the drum)in a dry room below 25°C.
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Increased temperature and light exposure will significantly reduce shelf life.Avoid direct sunlight and keep away from heat sources during storage.
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Unsaturated polyester resin liquid containing styrene is flammable.Keep away from open flames during storage.Refer to the Safety Data Sheet for details.

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