6 Using the product
42
Material (material temperature) Emissivity
Aluminium, bright rolled (170°C) 0.04
Cotton (20°C) 0.77
Concrete (25°C) 0.93
Ice, smooth (0°C) 0.97
Iron, emery ground (20°C) 0.24
Iron with casting skin (20°C) 0.80
Iron with rolling skin (20°C) 0.77
Gypsum (20°C) 0.90
Glass (90°C) 0.94
Rubber, hard (23°C) 0.94
Rubber, soft grey (23°C) 0.89
Wood (70°C) 0.94
Cork (20°C) 0.70
Radiator, black anodised (50°C) 0.98
Copper, slightly tarnished (20°C) 0.04
Copper, oxidized (130°C) 0.76
Plastics: PE, PP, PVC (20°C) 0.94
Brass, oxidized (200°C) 0.61
Paper (20°C) 0.97
Porcelain (20°C) 0.92
Black paint, matt (80°C) 0.97
Steel, heat-treated surface (200°C) 0.52
Steel, oxidized (200°C) 0.79
Clay, burnt (70°C) 0.91
Transformer paint (70°C) 0.94
Brick, mortar, plaster (20°C) 0.93
Reflected temperature information:
Using this offset factor, the reflection is calculated out based on the
low emissivity, and the accuracy of the temperature measurement
with infrared instruments is improved. In most cases, the reflected
temperature is identical to the ambient air temperature. Only when
objects with strong emissions and much higher temperatures (such
as ovens or machines) are in proximity to the object being
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