Untitled Document

High Temperature Graphite Surface Coat (Boeing Specifications) - HSC-905

Category: Surface Coats
Ratio: 100pbw to 20 pbw
Hardener: HT-8433
Description: HSC-905 is a high temperature two component epoxy surface coat. This surface coat has excellent chemical resistance along with resistance to extremely high temperature. Upon completion, the tool should be allowed to cure at ambient temperature. At that point apply an oven cure according to the following schedule. (This schedule is recommended for a tool which will be exposed to an operating temperature of 350°F.) 1 hour @ 150°F 1 hour @ 200°F 1 hour @ 250°F 1 hour at 300°F 3 hours @ 350°F 1 hour at 400°F After the oven has cooled to ambient temperature (77 degrees), remove the tool. (The final temperature of the post curing cycle should be 50 degrees Fahrenheit above the use temperature of the tool.) *If the tool is used at 400 degrees Fahrenheit the final post cure temperature is 450 degrees Fahrenheit for 1 hour.
Ratio By Weight: 100pbw/20pbw
Ratio by Volume: 5 to1
Pot Life at 72° F (200 Gram Mass): 60 mins.
Cure Time: 24 hours then post cure
Shore "D" Room Temperature: 85-88
Shore "D" 350°F: 80
Flexural Strength at 72°F: 55,000
Flexural Modulus at 72°F: 6.25 x 106
Flexural Strength at 350°F: 36,000
Flexural Modulus at 350°F: 4.10 x 106
Heat Distortion: 450°F
Density Resin: 9.6
Density Hardener: 8.3
Density Mixed: 9.4
Specific Gravity Resin: 1.17
Specific Gravity Hardener: 1.00
Specific Gravity Mixed: 1.09
Shelf Life Resin_Hardener: 1 year
Coefficient of Linear Thermal Expansion: 3.4 x 10-6/°C


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