NOVELTY - An insulating sheet comprises insulating layer (4), PTFE layer (3) placed behind insulating layer, adhesive layer (2) placed at below PTFE layer, protective paper (1) placed below adhesive layer and has size greater than size of insulating layer, flame retardant layer (5) in front of insulating layer, refractory layer (6), anti-corrosion layer (7), antistatic layer (8), and paraffin protective layer (9). Flame retardant layer contains polypropylene (PP), ethylene-vinyl acetate (EVA) resin, expanded graphite, hydrotalcite, aluminum hydroxide, magnesium hydroxide, PP fiber, and paraffin.    USE - An insulating sheet for biochemical-pharmaceutical device (claimed).    ADVANTAGE - The insulation sheet has good fire resistance, corrosion resistance, high temperature resistance, antistatic performance, and high safety and is convenient to prepare and environment-friendly.    DETAILED DESCRIPTION - An insulating sheet comprises insulating layer, PTFE layer placed behind insulating layer, adhesive layer placed at below PTFE layer, protective paper placed below adhesive layer and has size greater than size of insulating layer, flame retardant layer in front of insulating layer, refractory layer, anti-corrosion layer, antistatic layer, and paraffin protective layer. Flame retardant layer consists of 100 mass parts PP, 15-20 mass parts EVA resin, 3-5 mass parts expanded graphite, 3-5 mass parts hydrotalcite, 10-15 mass parts aluminum hydroxide, 10-15 mass parts magnesium hydroxide, 4-6 mass parts PP fiber, 3-4 mass parts paraffin, 3-5 mass parts impact modifier, 8-10 mass parts plasticizer, 2-3 mass parts stabilizer, 0.3-0.6 mass part coupling agent, 5-8 mass parts calcium carbonate, and 10-15 mass parts n-butanol. Anti-corrosion layer consists of 100 mass parts polyphenylene sulfide (PPS), 10-20 mass parts PTFE, 8-10 mass parts ethylene tetrafluoroethylene (ETFE), 2-4 mass parts montmorillonite, 3-5 mass parts glass fiber, 1-2 mass parts paraffin, 10-15 mass parts methyl methacrylate, 0.3-0.5 mass part nano-silicon dioxide, 1-2 mass parts propylene glycol, 0.5-0.8 mass part crosslinking agent, 6-8 mass parts plasticizer, 2-3 mass parts stabilizer, and 10-15 mass parts n-butanol.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic diagram of an insulating sheet.    Protective paper (1)    Adhesive layer (2)    PTFE layer (3)    Insulating layer (4)    Flame retardant layer (5)    Refractory layer (6)    Anti-corrosion layer (7)    Antistatic layer (8)    Paraffin protective layer (9)