DU Grade Expanding Microspheres CAS 38742-70-0 are white powder lightweight fillers suitable for rubber and plastic materials. In dry unexpanded status, the microspheres can achieve controllable thermal expansion during processing and form uniform closed-cell structures. They effectively lower product density and save raw material costs while maintaining elasticity, mechanical strength and surface quality of rubber and plastic finished goods. Featuring good dispersibility, stable expansion perfo

Product Detail

DU Grade Expanding Microspheres CAS 38742-70-0 Rubber Plastic Lightweight Filler White Powder

Product Overview

DU Grade Expanding Microspheres CAS 38742-70-0 are white powdery lightweight functional fillers designed for rubber and plastic industries. Supplied in dry unexpanded form, the microspheres remain stable at ambient temperature without premature foaming during mixing and feeding. Upon heating in molding, extrusion or vulcanization processes, they expand controllably and form evenly distributed closed-cell structures inside rubber and plastic matrix. This product effectively reduces product density and cuts raw material expenditure while retaining mechanical strength, elasticity and smooth surface finish of finished products. With excellent dispersion performance, stable expansion characteristics and broad formula adaptability, DU grade microspheres serve as economical multi-purpose lightweight additives for general rubber and plastic foaming projects.

Core Features

White Dry Unexpanded Powder, Good Flowability

Uniform white fine powder with favorable anti-caking and free-flowing properties. Easy to mix evenly with rubber and plastic raw materials, no agglomeration during continuous production.

Wide Compatibility for Rubber & Plastics

Applicable to most conventional thermoplastics and various general rubbers. Adaptable to diverse processing technologies including injection, extrusion and vulcanization molding.

Controllable Thermal Expansion & Uniform Closed Cells

Stable expansion behavior under proper processing temperature. Produces fine closed cells to achieve consistent lightweight effect and avoid voids, pits and surface defects.

Excellent Shear Resistance

Optimized shell structure withstands mechanical shear during kneading, extrusion and injection. Low particle breakage rate ensures homogeneous foaming across finished parts.

Cost-Effective Lightweight Solution

Low recommended addition dosage delivers obvious weight reduction. Help manufacturers save material costs without sacrificing key physical properties of rubber and plastic products.

Eco-Friendly Physical Foaming

Based on physical thermal expansion mechanism, no chemical decomposition, low odor and low VOC. Meet environmental requirements for daily goods, industrial accessories and automotive components.

Product Specifications

Product Name: DU Grade Expanding Microspheres

CAS No: 38742-70-0

Appearance: White dry unexpanded fine powder

Product Type: Lightweight filler, physical foaming agent

Applicable Materials: General plastics, modified polymers, various conventional rubbers

Applicable Processes: Injection molding, extrusion, rubber vulcanization

Core Function: Weight reduction, density lowering, foaming modification, raw material cost saving

Recommended Dosage: 1.0%–4.0% (adjust according to lightweight target and processing conditions)

Application Scope

Widely used for lightweight foaming modification of rubber and plastic products. Suitable for plastic profiles, sheets, injection molded parts, modified plastic pellets, foam rubber seals, shock-absorbing rubber parts and other general rubber & plastic products. It solves common issues such as heavy weight, high material consumption and poor dimensional stability of solid parts, extensively applied in building materials, consumer goods, automobile accessories and general industrial plastic processing sectors.

Usage Guide

Blend DU grade expanding microspheres with rubber or plastic raw materials uniformly via low-speed stirring at room temperature. Avoid long-time intense shear mixing and high-temperature preheating to prevent particle damage and premature expansion. Complete thermal expansion and closed-cell foaming under matched processing temperature during molding, extrusion or vulcanization. Adjust microsphere dosage, processing temperature and equipment parameters properly according to lightweight standards and surface quality requirements. Keep materials sealed and moisture-proof during production and storage.

Packaging & Storage

Packaging: 25kg sealed moisture-proof composite bag with inner PE liner, dust-proof and leak-proof for industrial bulk supply and long-distance transportation.

Storage: Store in dry, cool and ventilated warehouse. Keep tightly sealed all the time. Avoid direct sunlight, high-temperature stacking and humid environment to prevent caking and spontaneous foaming. Standard shelf life is 12 months under proper storage conditions.

Our Advantages

Our DU Grade Expanding Microspheres feature stable activity, reliable batch consistency and balanced performance-price ratio. It can be flexibly deployed in both rubber and plastic production lines to achieve stable lightweight foaming effect. We support factory direct sales, stable bulk supply, free sample testing and professional foaming formulation technical guidance to help customers optimize production costs and enhance product market competitiveness.

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