Simriz® Z7257

Z7257 vs. Requirements of SAE AMS 7257

Effective 18-Aug-99

Original Properties AMS 7257 Z7257
Hardness, Shore A 70 to 80 77
Tensile Strength, MPa 10.3 min 16.9
Tensile Strength, psi 1500 min 2458
Elongation, % 120 min 177
Temperature Retraction 10%, °C + 5 max + 4
Compression Set
% of Original Deflection (70 hrs at 230 °C) 40 max 29
Air Aging (70 hrs @ 290°C)
Hardness Change, points ± 5 0
Tensile Strength Change, % - 20 max - 9
Elongation Change, % - 5 max + 12
Weight Change, % - 5 max - 1
Fluid lmmersion - AMS 3021 (70 hrs @ 175°C)
Hardness Change, points ± 5 + 1
Tensile Strength Change, % - 10 max - 9
Elongation Change, % - 15 max - 7
Weight Change, % 0 to + 5 + 1
Fluid lmmersion - ASTM Fuel B (70 hrs @ 24°C)
Hardness Change, points ± 5 0
Tensile Strength Change, % - 20 max - 6
Elongation Change, % - 15 max - 7
Weight Change, % 0 to + 5 + 1
Fluid lmmersion - SKYDROL LD4 (70 hrs @ 125°C)
Hardness Change, points - 15 to 0 - 1
Tensile Strength Change, % - 40 max + 6
Elongation Change, % - 15 max + 2
Weight Change, % 0 to + 15 + 3

The information contained herein is believed to be reliable, but no representation, guarantees or warranties of any kind are made to its accuracy or suitability for any purpose. The information presented herein is based on laboratory testing and does not necessarily indicate end product performance. Full scale testing and product performance are the responsibility of the user.

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Marco Rubber & Plastics
PO Box 1150
Seabrook, NH 03874

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