... adopts thermotolerant alkali-free glass fibre as insulating material, resistance wire made of nickel-chromium is sealed in the insulating ... temperature,good heat preservation,no open fire.4,Anticaustic,aging resistance, sturdy and durable,safe and reliable.5,Easy to ... °C380°CWorking timecontinuouscontinuouscontinuouscontinuousPriceRMB/USD 630/100700/110875/1381280/203 Magnetic stirring heating mantle