Question

Define Yield Point. Define Yield Strength. Define Permanent Set. Define Plastic Deformation. Define Tensile Strength.

Answer 1



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Physical Properties of Rubber – a Buyer and Designer’s Guide

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Sponsored by Elasto Proxy, Inc.Apr 10 2015

Table of Contents

Introduction
Hardness
Tensile Strength
Tensile Modulus
Elongation
Resilience
Compression Set
Tear Resistance
Abrasion Resistance
Specific Gravity
Conclusion
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Introduction

The rubber materials selected by designers and technical buyers should meet all their application requirements. The inherent physical characteristics of elastomers can be modified through compounding. However, the knowledge of rubber’s physical properties and their measurement is critical for compound selection.

The following are the physical properties of rubber:

Specific gravity

Abrasion resistance

Tear resistance

Compression set

Resilience

Elongation

Tensile modulus

Tensile strength

Hardness

The article explains these properties of rubber in detail.

Hardness

The chemical structure of the elastomers provides them with an inherent hardness that can be altered. The modified hardness is then measured in terms of of durometer (duro) on a Shore scale. Shore A is used for a soft to medium-hard rubber. Solid rubber, with a consistency of pencil erasers, has a hardness of 40 duro. By contrast, harder rubber, like that used in hockey pucks, has 90 duro hardness. Figure 1 shows rubber with different hardness.

Answer 2

the variety of plant and animal life in the world or in a particular habitat, a high level of which is usually considered to be important and desirable.