Pre-expanded Microspheres CAS 38742-70-0 are hollow thermoplastic microspheres serving as ultra-low density filler for composite materials and buoyancy products. With intact closed-cell structure and ultra-light weight, they can be uniformly dispersed in various resin matrixes. The microspheres significantly reduce the density of composite materials, deliver stable buoyancy performance, and help control curing shrinkage. They show excellent compatibility with epoxy, polyurethane and other resins

Product Detail

Pre-expanded Microspheres CAS 38742-70-0 Ultra Low Density Filler for Composites Buoyancy Materials

Product Overview

Pre-expanded Microspheres CAS 38742-70-0 are hollow thermoplastic microspheres designed as ultra-low density functional fillers for composite materials and buoyancy components. Featuring complete closed-cell spherical structure, these microspheres can disperse evenly inside epoxy, polyurethane and other resin systems.

They greatly lower the density of composite parts and provide stable buoyancy performance. Meanwhile, the microspheres help mitigate curing shrinkage and reduce internal stress of finished products. With outstanding resin compatibility, they retain decent mechanical strength of composites. Widely adopted for marine buoyancy modules and lightweight structural parts, they are premium raw materials for high-performance buoyancy materials.

Core Features

Pre-expanded dry powder, ready to use
No secondary heating expansion required, simple feeding and mixing.
Ultra-low density closed-cell structure
Achieve remarkable lightweight effect and stable buoyancy performance.
Suppress curing shrinkage
Reduce volume shrinkage and lower risks of cracks and internal voids.
Excellent resin compatibility
Compatible with epoxy resin, PU resin, unsaturated polyester and other matrix materials.
Good flowability & dispersibility
Free-flowing powder, uniform distribution under low-speed mixing.
Stable underwater performance
Complete spherical shell structure prevents water penetration for long-term buoyancy stability.

Product Specifications

Product Name: Pre-expanded Microspheres

CAS No: 38742-70-0

Appearance: White free-flowing dry powder

Core Function: Ultra-low density filling, lightweight modification, buoyancy providing, shrinkage control

Applicable Systems: Epoxy composites, polyurethane composites, marine buoyancy materials

Recommended Dosage: Adjust proportion according to target density and buoyancy requirements

Application Scope

Mainly used for deep-sea buoyancy modules, marine floating parts, underwater detection equipment buoyancy blocks, lightweight composite structural parts, buoyancy foaming components, and low-density composite castings. Widely applied in ocean engineering, marine equipment manufacturing, new energy and composite material industries.

Usage Guide

Add microspheres at the later stage of resin mixing. Low-speed and gentle stirring is required to avoid high shear force breaking microsphere shells. Avoid prolonged intense agitation. Optimize dosage to balance buoyancy, density and mechanical performance. Keep packages tightly sealed to prevent moisture absorption during storage.

Packaging & Storage

Packaging: Moisture-proof composite bags or fiber drums with inner plastic liner.

Storage: Store in cool, dry and ventilated warehouse. Avoid dampness, heavy extrusion and direct sunlight.

Shelf Life: 12 months under qualified dry storage conditions.

Our Advantages

Our pre-expanded microspheres feature intact shell structure, stable particle size and consistent batch density. Compared with traditional hollow fillers, less dosage can reach ultra-low density targets with reliable water resistance. Factory direct supply, sufficient stock, free sample testing and composite formulation technical support are available.

Previous : DE Grade Expanded Microspheres CAS 38742-70-0 Lightweight Putty Joint Compound Filler Next : Dry Expanded Hollow Microspheres CAS 38742-70-0 Paint Matting Agent Surface Texture Modifier

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