... company have got Patent for invention of PCMs, filling materials in the ice pillow * PCM cool mat ... in the sunlight as it destroys the filling materials.5. filling material is not edible.6. please do ... below: 1. PCM(phase change material), first used as filling material of cool mat, we begin it, and ... of PCM PCM Patent 2. Our PCM, the filling material, higher quality and better cooling effects, enjoying ...