... ; 2)MSDS, CE, ISO13485 tested; 3)OEM welcomed Cold & Hot Pack Also known as: cold hot pack, gel pad, gel pack, compress pack, microwavable ... hot cold pack, etc. MaterialPVC, PE+PA or Nylon+PVCSpec.29x12cm ... the heat, and immerse the gel pack for approximately 4-10 minutes. After 4 minutes, check every 1 minutes to see if ...