... above sea level,3. Strong acid, strong alkali, salt, weak acid, weak base and corrosion, much water and dust, damp and environment ... casting do high-pressure electrostatic plastic-sprayed surface, fightWeak acid, weak base, waterproof, dustproof,2. FAF - g shell ... stainless steel material bending welded together, resistant to strong acid, strong alkali,Salt corrosion, waterproof, dustproof,3. Toughened ...