GPT Flange Isolation Kits
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Common LineBacker® & GasketSeal® Sealing Gasket Physical Properties |
ASTM Test |
Property | Plain Phenolic |
Neo-faced Phenolic |
Hi-temp Phenolic G-3 |
Silicone Glass G-7* |
Epoxy Glass G-10 |
Epoxy Glass G-11 |
D149 |
Dielectric strengths, |
500 | 500 | 550 | 350-400 | 550 | 550 |
D695 |
Compressive strength, |
25,000 | 25,000 | 50,000 | 40,000 | 50,000 | 50,000+ |
D229 |
Water absorption, % |
1.6 | 1.6 | 0.7 | 0.07 | 0.10 | 0.10 |
D257 |
Insulating Resistance, |
40,000 | 40,000 | 46,000 | 2,500 | 200,000 | 200,000 |
D790 |
Flexural strength, psi |
22,500 | 22,500 | 60,000 | 27,000 | 60,000 | 75,000+ |
D785 |
Hardness Rockwell "M" |
85 | 85 | 115 | 105 | 115 | 115 |
D256 |
IZOD Impact, |
1.2 | 1.2 | 12.0 | 8.0 | 14.0 | 12.0 |
D732 |
Shear strength, psi |
10,000 | 10,000 | 18,000 | 20,000 | 22,000 | 22,000 |
D229 |
Operating temp, ºF |
-65 to +220 |
-65 to +175 |
-65 to +392 |
Cryogenic to +450 |
Cryogenic to +280 |
Cryogenic to +350 |
Operating temp, ºC |
-54 to +104 |
-54 to +79 |
-54 to +200 |
-Cryogenic to +232 |
Cryogenic to +138 |
Cryogenic to +177 |
* = G-7 material should not be used with hydrocarbons, not even trace amounts.
Seal Element Temperature Limits |
Nitrile | Viton | Teflon | Neoprene | EPDM |
-65 to +250°F | -20 to +350°F | Cryogenic to +450°F | -40 to +175°F | -65 to +300°F |
-54 to +121°C | -29 to +177°C | Cryogenic to +232°C | -40 to +79°C | -54 to +149°C |
Consider both retainer and seal element temperature limits together
for GasketSeal® and LineBacker® Sealing Gaskets.
Flange Isolation Washer Sets |
![]() Single washer set flange isolation kits include the following items for each bolt:
Application Considerations: |
![]() Double washer set flange isolation kits include the following components for each bolt:
Application Considerations: |
![]() One-piece sleeve and washer set flange isolation kits include the following items for each bolt:
Application Considerations: |
Typical Specifications
General / Economical
Top of the Line
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