Grading Guide

Temp F˚ (C˚)
Emissivity
Stellite, Polished
68 (20) 0.18
Tantalum, Unoxidised
1340 (727) 0.14
2000 (1093) 0.19
3600 (1982) 0.26
5306 (2930) 0.3
Tin, Unoxidised
77 (25) 0.04
212 (100) 0.05
Tinned Iron, Bright
76 (24) 0.05
212 (100) 0.08
Titanium
Alloy C110M,Polished 300-1200
(149-649)
.08-.19
Oxidised at 1000 ˚ F (538 ˚ C)
200-800
(93-427)
.51-.61
Alloy Ti-95A,Oxidised at 1000 ˚ F
(538 ˚ C)
200-800
(93-427)
.35-.48
Anodized onto SS 200-600
(93-316)
.96-.82
Tungsten
Unoxidised 77 (25) 0.02
Unoxidised 212 (100) 0.03
Unoxidised 932 (500) 0.07
Unoxidised 1832 (1000) 0.15
Unoxidised 2732 (1500) 0.23
Unoxidised 3632 (2000) 0.28
Filament (Aged) 100 (38) 0.03
Filament (Aged) 1000 (538) 0.11
Filament (Aged) 5000 (2760) 0.35
Uranium Oxide
1880 (1027) 0.79
Zinc
Bright, Galvanised 100 (38) 0.23
Commercial 99.1% 500 (260) 0.05
Galvanised 100 (38) 0.28
Oxidised 500-1000
(260-538)
0.11
Polished 100 (38) 0.02
Polished 500 (260) 0.03
Polished 1000 (538) 0.04
Polished 2000 (1093) 0.06
Temp F˚ (C˚)
Emissivity
Platinum, Black
100 (38) 0.93
500 (260) 0.96
2000 (1093) 0.97
Platinum Oxidised at 1100
500 (260) 0.07
1000 (538) 0.11
Rhodium Flash (0.0002 on 0.0005 Ni)
200-700
(93-371)
.10-.18
Silver
Plate
(0.0005 on Ni)
200-700
(93-371)
.06-.07
Polished 100 (38) 0.01
Polished 500 (260) 0.02
Polished 1000 (538) 0.03
Polished 2000 (1093) 0.03
Steel
Cold Rolled 200 (93) .75-.85
Ground Sheet 1720-2010
(938-1099)
.55-.61
Polished Sheet 100 (38) 0.07
Polished Sheet 500 (260) 0.1
Polished Sheet 1000 (538) 0.14
Mild Steel, Polished 75 (24) 0.1
Mild Steel, Smooth 75 (24) 0.12
Mild Steel, liquid 2910-3270
(1599-1793)
0.28
Steel, Unoxidised 212 (100) 0.08
Steel, Oxidised 77 (25) 0.8
Steel Alloys
Type 301, Polished 75 (24) 0.27
Type 301, Polished 450 (232) 0.57
Type 301, Polished 1740 (949) 0.55
Type 303, Oxidised 600-2000
(316-1093)
.74-.87
Type 310, Rolled 1500-2100
(816-1149)
.56-.81
Type 316, Polished 75 (24) 0.28
Type 316, Polished 450 (232) 0.57
Type 316, Polished 1740 (949) 0.66
Type 321 200-800
(93-427)
.27-.32
Type 321 Polished 300-1500
(149-815)
.18-.49
Type 321 w/BK Oxide 200-800
(93-427)
.66-.76
Type 347, Oxidised 600-2000
(316-1093)
.87-.91
Type 350 200-800
(93-427)
.18-.27
Type 350, Polished 300-1800
(149-982)
.11-.35
Type 446, Polished 300-1500
(149-815)
.15-.37
Type 17-7 PH 200-600
(93-316)
.44-.51
Type 17-7 PH Polished 300-1500
(149-815)
.09-.16
Type C1020, Oxidised 600-2000
(316-1093)
.87-.91
Type PH-15-7 MO 300-1200
(149-649)
.07-.19
139697 Rev. 03/14 B
EMISSIVITY CHART
Non-Metal and
Metal Materials
METAL MATERIALS