... , uniform size. High compressive strength, non-friable. Far infrared release large, and have good health care function. Main Index ... particlesConcentration≥20%Particle diameter≥1umDensity0.9±0.2g/mlFar infrared release rate≥90%(-22um) ApplicationBuilding and installation industry. ... decoration industries. Tile in the pillow, under the mattress cushion, etc.,the release of negative ions for health-care ...