Alloy

Colmonoy 21A PTA

Alloy Type

Nickel with Chromium Boride

Nominal Composition (%)

C 0.30
Si 4.10
Cr 5.80

Rockwell Hardness
(C-scale)

25-32

Density (gm/cc)

8.45

Fusing Temperature (approx.)

2050°F
1120°C

Resistance:

to
Abrasion

to

Corrosion

to
Impact

to
Galling

4

2

1

3

Supplied Forms

Atomized Powder

Method of application

PTA

Description and General Uses

Used primarily on glass container moulds and related parts, to fill in defects and worn areas.  Contains chromium for resistance to wear and sulfur-containing media.  Also used as cushion for harder overlays such as Colmonoy 56PTA.