To expand on Pete's Permatex question:
While Permatex Ultra Grey may fall short of the Dirko products (Grey and HT) it looks like Permatex OPTIMUM GREY may compare favorably with Dirko Grey HT.
Tensile strength (which generally refers to break-away resistance) is lower.
Tensile strength and elongation will create a reasonably accurate breakaway resistance.
This is important because you will inevitably have some squeeze-out when joining two machine surfaces. You do not want squeeze-out/break-away traveling through your engine.
Quote:
Technical Data Sheet Optimum Grey RTV Silicone Gasket Maker
After 7 days at 25C (77F), 50% Relative Humidity
Typical Values
Hardness (Shore A) 30-40
Elongation, >300 %*
Tensile Strength, N/mm2 (psi) ** >1.72 (>250)
*Material will stretch 3 times its original length before breaking.
**Amount of force required to break material.
Temperature Resistance Typical Values
Continuous, C (F) -54 to 316 (-65 to 600)
Intermittent, C (F) -54 to 371 (-65 to 700
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