Wet Unexpanded Microspheres CAS 38742-70-0 are professional water-based thermally expandable foaming agents designed for leather finishing. Provided in wet form, the microspheres disperse evenly within aqueous leather finishing formulations without agglomeration. Upon heating, they expand controllably to form fine closed-cell structures, delivering lightweight texture, soft hand feel and improved scratch resistance to leather surface. Compatible with water-based polyurethane and acrylic finishin

Product Detail

Wet Unexpanded Microspheres CAS 38742-70-0 Leather Finishing Water-based Foaming Agent

Product Overview

Wet Unexpanded Microspheres CAS 38742-70-0 is a thermally expandable foaming additive customized for water-based leather finishing systems. The product is supplied in wet form, solving the dispersion difficulty of dry microspheres in aqueous leather formulations. It can be uniformly blended into waterborne polyurethane, acrylic leather finish without agglomeration.

Microspheres remain stable at ambient temperature and will not expand prematurely during mixing. In the heating and drying process of leather finishing, they expand controllably to form uniform fine closed cells. The finished leather gains lighter weight, softer hand feel, improved elasticity and scratch resistance. Widely used for synthetic leather, artificial leather and genuine leather surface foaming modification, it is a premium foaming functional agent for leather water-based finishing lines.

Core Features

Excellent water-based dispersion
Wet-form microspheres disperse rapidly in aqueous leather coating slurry, no agglomeration, no particle floating.
Controllable thermal foaming performance
Stable expansion temperature range, forms dense closed cells, brings consistent soft touch and lightweight effect.
Compatible with mainstream leather resins
Perfect match with waterborne PU, acrylic finishing agents, does not damage film-forming property of coating.
No premature expansion during production
Tolerates normal low-speed stirring at room temperature, stable foaming effect in continuous mass production.
Enhance leather surface performance
Optimize leather texture, reduce surface gloss properly, improve wear resistance and resilience.
Environment-friendly physical foaming
Low VOC, free of harmful blowing agents, meets environmental requirements for leather export.

Product Specifications

Product Name: Wet Unexpanded Microspheres

CAS No: 38742-70-0

Appearance: White wet slurry

Function: Water-based foaming, lightweight modification, soft hand feeling adjustment

Applicable systems: Water-based leather finishing agent, aqueous leather top coat & middle coat

Application objects: Synthetic leather, artificial leather, genuine leather

Recommended dosage: 1%–3% based on total formula

Application Scope

Mainly applied in water-based foamed middle layer and top finishing of synthetic leather, microfiber leather, artificial leather and genuine leather. Suitable for furniture leather, shoe leather, garment leather, luggage leather and automotive interior leather. It replaces traditional chemical foaming agents to achieve fine foam layer, upgrade leather tactile experience and added value.

Usage Guide

Add wet unexpanded microspheres into leather water-based finishing liquid under low-speed stirring at room temperature. Avoid high-shear stirring and excessive heating to prevent premature expansion. Complete thermal foaming during leather drying and baking process. Adjust dosage, baking temperature and time according to target softness and foaming thickness. Seal storage to avoid high temperature and direct sunlight.

Packaging & Storage

Packaging: Industrial sealed plastic drum packaging, leak-proof for long-distance transportation.

Storage: Keep tightly sealed, store in cool and ventilated warehouse. Avoid freezing, direct sunlight and high temperature environment. Shelf life: 12 months under proper storage conditions.

Our Advantages

Our wet unexpanded microspheres feature stable particle size and consistent foaming performance. Designed for leather aqueous finishing, outstanding dispersion in water-based resin systems. Factory direct supply, stable batch quality, free sample test and professional technical support. We help leather manufacturers optimize finishing formula and improve product 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.