120-150℃ Expanding Microspheres CAS 38742-70-0 serve as physical foaming agent and lightweight filler customized for silicone rubber. Microspheres expand uniformly within 120-150℃ processing range to form fine closed-cell structure inside silicone rubber. It effectively reduces product density, delivers excellent cushioning performance and low shrinkage rate. The product features good compatibility with silicone formulations, stable foaming effect, no residue, suitable for lightweight production

Product Detail

120-150℃ Expanding Microspheres CAS 38742-70-0 Silicone Rubber Foaming Agent Lightweight Filler

Product Overview

120-150℃ Expanding Microspheres CAS 38742-70-0 are professional physical foaming agents and lightweight functional fillers specially formulated for silicone rubber processing. Matching the typical curing and molding temperature range of silicone rubber, the microspheres achieve stable and uniform thermal expansion at 120-150℃, forming dense, fine and independent closed-cell structures inside silicone rubber materials. This effectively reduces the overall density of silicone products, realizes lightweight modification, and significantly improves cushioning flexibility, surface texture and thermal insulation performance. Adopting pure physical foaming technology, the product features low shrinkage, no chemical residues, excellent compatibility with silicone systems and stable batch performance. It is an ideal lightweight foaming additive for various silicone rubber finished parts.

Core Features

Precise 120-150℃ Foaming Window: Customized medium-temperature activation temperature perfectly fits silicone rubber molding and curing process. It achieves full and uniform expansion within the processing temperature range, avoiding insufficient foaming or microsphere rupture, and adapts to mainstream silicone production processes.

Excellent Lightweight Modification: Effectively reduces the density of silicone rubber products, lowers material consumption and product weight without sacrificing the basic toughness and structural stability of silicone materials, helping manufacturers realize lightweight and cost reduction upgrading.

Uniform Closed-Cell Structure: Forms regular and dense closed-cell pores after expansion. The cell size is uniform with no hollow cavities or uneven bubbles, effectively improving the softness, cushioning performance and thermal insulation effect of silicone rubber products.

Low Shrinkage & Dimensional Stability: The foamed microsphere structure has strong structural stability. It effectively inhibits thermal shrinkage and deformation of silicone products during molding and use, ensuring stable product size and high finished product yield.

Superior Silicone System Compatibility: Ultra-fine powder with good dispersion in silicone rubber raw materials. No agglomeration, precipitation or floating powder, which does not affect the vulcanization performance, bonding force and surface smoothness of silicone products.

Eco-Friendly & Safe Physical Foaming: Pure physical thermal expansion molding, no chemical decomposition, no harmful volatiles and peculiar smell, low VOC. Compliant with environmental protection and safety standards for daily-use and industrial silicone products.

Product Specifications

Product Name: 120-150℃ Expanding Microspheres

CAS No: 38742-70-0

Product Type: Silicone Rubber Physical Foaming Agent / Lightweight Filler

Foaming Temperature Range: 120℃–150℃

Appearance: White Ultra-Fine Powder

Applicable Material: All kinds of silicone rubber and silicone composite materials

Core Function: Lightweight filling, physical foaming, cushioning improvement, heat insulation, anti-shrinkage

Recommended Dosage: 1.5%–3.5% (Adjustable according to lightweight and foaming requirements)

Application Scope

Widely used in lightweight foaming modification of various silicone rubber products. Suitable for silicone daily necessities, silicone sealing parts, silicone shock-absorbing gaskets, thermal insulation silicone accessories, flexible silicone decorative materials and industrial silicone rubber products. It is dedicated to solving the problems of heavy weight, hard hand feel and poor thermal insulation of traditional solid silicone products, and is widely applied in daily products, electronic accessories, industrial sealing and other fields.

Usage Guide

Add the expanding microspheres into silicone rubber raw materials at room temperature with low-speed stirring, and mix slowly until fully and evenly dispersed. Strictly avoid high-speed shear stirring and ultra-high temperature preheating to prevent microsphere damage and premature foaming. After uniform mixing, perform conventional silicone rubber vulcanization, molding and curing processes. Complete stable thermal expansion and closed-cell forming under 120-150℃ processing temperature. Adjust the dosage, curing temperature and holding time appropriately according to the target lightweight degree and softness. Keep sealed and moisture-proof during storage and production operation.

Packaging & Storage

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

Storage: Store in a dry, cool and ventilated indoor environment, keep tightly sealed all the time. Avoid humid air, direct sunlight and long-term high-temperature stacking to prevent microsphere caking and spontaneous foaming. The standard shelf life is 12 months under qualified storage conditions.

Our Advantages

Our 120-150℃ expanding microspheres feature accurate and stable foaming temperature window, uniform expansion ratio and excellent adaptability to silicone rubber systems. The product can stably prepare lightweight, soft, low-shrinkage silicone foamed products with fine and consistent pore structure, effectively reducing production defective rate and material cost. We support factory direct sales, long-term stable bulk supply, free sample testing and professional silicone formula technical guidance, helping customers optimize product performance and improve market competitiveness.

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Jishengya Technology

Shenzhen Jishengya Technology Co., Ltd. is located in Shenzhen, a special economic zone, and is a comprehensive technology enterprise integrating independent R&D, production and sales.