Insulation Flange Gasket Kits are used for controlling losses due to corrosion. They can be used to control stray electric currents in piping at oil, gas, water, refinery, and chemical plants, to increase the effectiveness of cathodic protection systems.
Type “D” insulation gaskets are available for RTJ flanges but the KXT-150 Sealing Gasket is an excellent alternative to “D” gaskets because the sealing element may be positioned anywhere between the I.D. of the gasket and I.D. of the ring groove.

Sealing Gasket Physical Properties

Property	Plain Phenolic	Silicone Glass G-7*	Epoxy Glass G-10	Epoxy Glass G-11
Dielectric strengths, Volts/mil	500	350-400	550	550
Compressive strength, psi	25,000	40,000	50,000	50,000+
Water absorption, %	1.6	0.07	0.10	0.10
Insulating Resistance, Meg Ohms	40,000	2,500	200,000	200,000
Flexural strength, psi	22,500	27,000	45,000	43,000
Operating temp, ºF	-65 to +220	-292 to +450	-292 to +280	-292 to +350
Operating temp, ºC	-54 to +104	-180 to +232	-180 to +138	-180 to +177

 

* = G-7 material should not be used with hydrocarbons, not even trace amounts.

Type D Flange Insulation Gaskets are suitable for RTJ flange, they can be produced according to ASME and API flange standard.