BG HitCoat®

green

BG HitCoat®

white

BG HitCoat®

black

BG HitCoat®

superemissive

Appearance

Green

matt

White-grayish

matt

Black-grayish

matt

Gray

matt

Melting point  [^oC/^oF]

1,900/3,450

1,500/2,730

1,000/1,830

1,550/2,820

Thermal expansion [K-1]

7,2x10-6 - 6,4x10-5

9,3x10-6 - 4,8x10-5

1,1 - 4,3x10-5

1,9 - 5,2x10-5

Thermal conductivity [W.m-1.K-1] @ 400^oC/750^oF ¹⁾

1,02

0, 83

1,14

1,23

Density [g/cm3]

2,4

2,4

3,3

2,7

Weight loss [%] @750^oC/1,380^oF

<0,1

<0,1

<0,1

<0,1

Porosity [%] @20^oC / 68^oF

<0,1

<0,1

<0,1

<0,1

Thermal shocks resistance  [K/s]

>500

>500

>200

>200

Adhesion to metals [MPa/psi] ²⁾

13-15/1,885-2,175

12-14/1,740-2,030

11-13/1,595-1,885

10-12/1,450-1,740

Adhesion to ceramics ²⁾

>substrate

strength

>substrate

strength

>substrate

strength

>substrate

strength

Abrasion resistance  @20^oC/68^oF ³⁾

3,7 (100%)

4,6 (100%)

1,5 (100%)

2,9 (100%)

Abrasion resistance @1,000^oC/1,830^oF  ^{3) 4)}

3,5 (106%)

4,4 (105%)

1,2 (125%) ⁵⁾

2,6 (112%)

Emissivity ⁶⁾

0,50 – 0,95

x

x

0,93 – 0,98

Emissivity ⁷⁾

>0,95

x

x

>0,96

1)  Red Hot Wire method                                                      2) CSN EN 24 624                                                            3) ASTM C 704 – 94                                             
4)  Temperature gradient during test ΔT= -980^oC / -1,800^oF
5)  Starting temperature 700^oC / 1,290^oF, ΔT= -680^oC / -1,256^oF     6)  For temperature  range 500 – 1100^oC / 930 - 2,010^oF and IR spectrum 2 – 22 μm     
7)  For water vapors and CO2 absorption bands at operation temperatures