3M Glass Bubbles K25 Low-Density Hollow Glass Microspheres for Epoxy, PU & Composite Lightweighting

Full Name & Product Positioning

Product Full Name: 3M K25 Processing-Resistant Low-Density Hollow Glass Microspheres (Imported from South Korea)

A commonly used balanced grade in the K series, combining low density with compressive and processing resistance. Suitable for medium-condition systems in epoxy, PU, and composite materials. A cost-effective choice for lightweight modification.

Core Technical Parameters

· True Density: 0.25 g/cm³

· Compressive Strength: 750 psi

· Physical Form: White fluffy powder

· Standard Packaging: 30 kg/South Korean original packaging

· Material: Hollow borosilicate glass

· Core Characteristics: Lightweight, low-pressure resistant, easy dispersion, high versatility

Key Advantages

· Compared to K1/K15, compressive performance is improved, capable of handling light-pressure processing conditions.

· Achieves weight reduction while maintaining basic structural stability of products.

· Good compatibility with epoxy, PU resins, and composite materials, with uniform mixing and dispersion.

· Helps reduce system shrinkage, improve thermal and sound insulation, and optimize overall raw material costs.

· Imported grade with stable quality and low impurities, helping to improve mass production yield.

Main Application Areas

Core Applications: Epoxy products, PU composite materials, industrial coatings, general lightweight filling

Suitable Areas: Thermal insulation profiles, lightweight structural composites, anti-corrosion coatings, sealing filling systems

Prohibited Scenarios: High-shear injection molding and extrusion, high-pressure molding, ultra-high-strength industrial products, food-contact products