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Mega-Pistonr Review Part I: The Polycarbonates |
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Written by Jay
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Tuesday, 09 November 2004 |
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Page 6 of 17 Candidate 5: G&P Polyacetal High Pressure Piston
G&P chose to construct their pistons out of "polyacetal", also known as POM (polyoxymethylene), which is a thermoplastic polymer with similar mechanical properties to polycarbonate. In general, polyacetal is not quite as strong as polycarbonate but has significantly more toughness. Additionally, polyacetal has good inherent surface lubricity and high fatigue strength. These factors should in theory combine to make a great reinforced piston. G&P also departs from the traditional 1 metal tooth design by providing 3 metal teeth for increased strength. Several "cut-outs" are molded into the top of the piston, creating a backbone-like structure which may increase strength while reducing weight. Cursory examination reveals some visible molding lines and a smooth molded surface. The 3 metal teeth have a rough shiny coating, similar to Deepfire teeth.
Piston: G&P Polyacetal High Pressure Piston
Weight: 0.5oz
Piston Material: polyacetal
Metal Teeth: 3
Average Barcol Hardness (piston): 12.9
Average Barcol Hardness (tooth): 84.1
Tapered Lip: yes, slightly
Distinguishing Feature: 3 metal teeth, molded backbone
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The molded surface is smooth to the touch, with minor casting lines visible. The "backbone" is clearly visible in the photo above.
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