MECHANICAL

Rubbers

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Contents

Overview

The hardness of most rubbers is specified using the Shore A scale (while the Shore D scale is used for harder materials). There are formulas (Wikipedia’s version, 3D Vision’s version) which gives an equation to convert Shore A hardness values into a Youngs Modulus, useful when you want to calculate the force required to compress the rubber by a certain amount. Each version of the equation gives different results, so treat the values with caution.

Nitrile Rubber

Nitrile is has a better resistance to fuel than Neoprene. It is also slightly more expensive (see the Price Guide). Unique property is that you can get it in white

Stats

P = poor, F = fair, G = good, E = excellent

PropertyValue
Hardness (Shore A)60
Usable Temperature Range (C)-40 to 101.7
Max Tensile Strength (MPa)7.0 to 24.6
AbrasionG
Tear ResistanceF
Electrical InsulationP
Flame ResistanceP
Ozone ResistanceF
UV ResistanceG
Acid ResistanceG
Solvent ResistanceP
Oil ResistanceE

Price Guide

Thickness (mm)Price (NZ$, as of 2012, exc. GST)
1.5235.80
3.0455.70
4.5697.30
6865.11
101441.86

Neoprene Rubber

Neoprene is a very popular rubber due to it’s good fuel, flame and sunlight resistance. Cheaper than Nitrile rubber (see the Price Guide).

Stats

P = poor, F = fair, G = good, E = excellent

PropertyValue
Hardness (Shore A)60
Usable Temperature Range (C)-45.6 to 126.7
Max Tensile Strength (MPa)17.6 to 21
AbrasionG
Tear ResistanceG
Electrical InsulationF
Flame ResistanceE
Ozone ResistanceE
UV ResistanceG
Acid ResistanceG
Solvent ResistanceG
Oil ResistanceG

Price Guide

Thickness (mm)Price (NZ$, as of 2012, exc. GST)
1.5225.69
3.0387.71
4.5668.37
6775.43
101133.23

Suppliers

NZ Rubber And Foam

Authors

Geoffrey Hunter

Dude making stuff.

Creative Commons License
This work is licensed under a Creative Commons Attribution 4.0 International License .

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