THERMOSHIELD 1635G CONTINUOUS OPERATING TEMPERATURE: 320°C EXCURSION TEMPERATURE: 350°C MAXIMUM PRESSURE: +/- 35kPa (5psi) THICKNESS: 1.4mm MASS: 1635g/m² CHEMICAL RESISTANCE: Sulphuric acid (Hot 50% solution)- little or no effect Hydrochloric acid (Hot 20% solution)- little or no effect Anhydrous ammonia - little or no effect Caustic soda (+20% solution)  - little or no effect PERMEATION: None from either side especially when exposed to weather and harsh industrial condition. APPLICATIONS: Used in high-acid and harsh industrial conditions.