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Technical Properties of Vitreous Enamel Steel


Characteristic Measure
Hardness 5 - 7 Mohs (average 6.7 Mohs)
Scratch resistance 70% remaining gloss reflection
Torsion resistance 200%
Chemical resistance resistant to almost all acids and salts
resistant to alkaline solutions
resistant to organic solutions
Heat resistance up to 650°C
Photo-chemical resistance to UV
Thermal shock resistance more than 240°C (513 K)
Resistance to shock > 20 N (1mm Ø)
Specific density 2.4 - 2.8 kg/dm³ (24 - 28 N/dm³)
Compressive strength 70 - 100 kg/mm² (700 - 1000 MN/m²)
Modulus of elasticity 7000 kg/mm² (70 000 MN/m²)
Elongation of rupture 0.2 - 0.3%
Bond 7 kg/mm²
Surface tension 220 - 270 dyne/cm (0.22 - 0.27 N/m)
Softening limit 450 - 550°C (723 - 823 K)
Linear coefficient of expansion / contraction 10 X 10^-6/°C; (1/K)
Specific heat 0.2 cal/d°C (0.84 kJ/kgK)
Coefficient of heat conduction 0.002 cal/cm sec °C (0.84 W/Km)
Scattering reflection up to 85% depending on type / colour
General reflection up to 93%
Diffuse reflectance (white) up to 88%
Rigidity ± 3 x original steel sheet
Electrical properties vitreous enamels are non-conductors
break-down voltage = 25 kv/mm
di-electric constant = 5 - 12