Medium Temp Expandable Microspheres CAS 38742-70-0 are physical blowing agents developed for EPDM rubber. Microspheres expand uniformly within medium temperature range to form fine closed-cell structure inside EPDM materials, effectively lowering product density and realizing lightweight effect. It boasts good compatibility with EPDM formulations, stable foaming performance, low shrinkage and consistent cell distribution, ideal for lightweight processing of EPDM sealing strips, gaskets and shock

Product Detail

Medium Temp Expandable Microspheres CAS 38742-70-0 EPDM Rubber Physical Blowing Agent Density Reduction

Product Overview

Medium Temp Expandable Microspheres CAS 38742-70-0 are professional physical blowing agents customized for EPDM rubber lightweight modification. The activation temperature matches the conventional vulcanization temperature of EPDM compounds. During medium-temperature processing, microspheres expand evenly and stably to form fine, independent closed-cell structures inside rubber. It effectively reduces product density to achieve lightweight effect, improving softness, shock absorption and thermal insulation performance of finished products. Based on physical foaming mechanism, this additive features low shrinkage rate, uniform cell distribution and good compatibility with EPDM formulations. No harmful residues after foaming, making it an optimal foaming additive for EPDM sealing elements, shock-absorbing parts and rubber profiles.

Core Features

Matched Medium-Temperature Foaming Performance

Activation temperature adapts to mainstream EPDM vulcanization processes. Microspheres fully expand evenly without over-expansion rupture or insufficient foaming, suitable for continuous mass production.

Effective Density Reduction & Lightweight Effect

Greatly lower the weight of EPDM rubber products and cut raw material consumption. While retaining basic mechanical properties of rubber materials, it brings softer hand feel and better cushioning capacity.

Uniform Closed-Cell Structure

Regular and dense closed pores form after expansion. Consistent cell size avoids cavities and surface defects, optimizing surface smoothness and stability of EPDM finished products.

Low Shrinkage & Excellent Dimensional Stability

Foamed structure maintains favorable shape retention. It effectively relieves thermal shrinkage and deformation during vulcanization, raising finished product yield and stable dimensional consistency.

Great Compatibility with EPDM Systems

Uniformly dispersed in EPDM rubber compounds without agglomeration. It will not affect vulcanization speed, tensile performance or surface appearance of EPDM materials.

Eco-Friendly Physical Foaming Technology

Adopt pure thermal expansion without chemical decomposition. Low odor and low VOC, meeting environmental standards for automotive, construction and industrial rubber accessories.

Product Specifications

Product Name: Medium Temp Expandable Microspheres

CAS No: 38742-70-0

Product Type: EPDM Rubber Physical Blowing Agent / Lightweight Filler

Foaming Temperature Range: 120℃–155℃

Appearance: White Ultra-Fine Powder

Applicable Material: EPDM rubber, EPDM blended rubber

Core Function: Physical foaming, density reduction, lightweight modification, shock absorption enhancement, anti-shrinkage

Recommended Dosage: 1.2%–3.8% (Adjust according to target density and foaming requirements)

Application Scope

It is widely used in lightweight foaming processing of various EPDM rubber products. Suitable for automotive EPDM sealing strips, construction rubber profiles, shock-absorbing gaskets, thermal insulation rubber pads and other industrial EPDM rubber accessories. It solves the pain points of heavy weight and stiff handfeel of solid EPDM products, extensively applied in automobile manufacturing, construction engineering, electronic shock absorption and other industries.

Usage Guide

Add expandable microspheres to raw EPDM rubber under low-speed mixing at room temperature, blend slowly until fully homogeneous. Avoid high-shear stirring and excessive preheating to prevent microsphere breakage and premature foaming. After even mixing, carry out standard EPDM extrusion, molding and vulcanization procedures. Complete thermal expansion and closed-cell formation under medium-temperature vulcanization conditions. Adjust dosage, vulcanization temperature and holding time based on target density and softness. Keep materials sealed and moisture-proof during usage and storage.

Packaging & Storage

Packaging: 25kg sealed moisture-proof composite bag with inner PE liner, dust-proof and leak-proof for bulk production 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 air to prevent caking and spontaneous foaming. The standard shelf life is 12 months under proper storage conditions.

Our Advantages

Our medium temperature expandable microspheres have stable foaming interval, stable expansion ratio and outstanding adaptability to EPDM rubber systems. The product helps manufacturers produce lightweight, low-shrinkage EPDM foamed products with delicate and uniform cell structure, lowering reject rate and material cost. We support factory direct sales, stable bulk supply, free sample testing and professional EPDM formulation technical guidance to help customers improve product market competitiveness。

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