Professional Durometer Reference Tool

Shore Hardness Scale Calculator & Conversion Tool

The most comprehensive online tool for Shore hardness conversion, material selection, and durometer testing. Trusted by engineers and manufacturers worldwide.

Instant Conversion
12 Shore Scales
ASTM D2240
Interactive Calculator

Shore Hardness Converter

Convert between Shore scales and calculate Young's modulus

Conversion Results

Shore A
70
Shore D
20
Shore OO
N/A
Young's Modulus (MPa)
8.4

Visual Hardness Comparison

Interactive scale showing material ranges

Shore OO (Very Soft)

0-100
Gel 20 Sorbothane 40 Soft Foam 70

Shore A (Flexible Rubber)

0-100
Rubber Band 25 Door Seal 50 Tire 65 Hard Rubber 90

Shore D (Hard Plastics)

0-100
Hard Urethane 50 Hard Hat 75 Acrylic 85
Very Soft (OO)
Flexible (A)
Semi-Rigid (A-D)
Rigid (D)

Material Hardness Examples

Real-world applications organized by hardness range

Very Soft (Shore OO)

Range: 0-40

3 items

Chewing Gum

Flexible consumer products

20 OO

Gel Insoles

Cushioning and comfort

15-30 OO

Sorbothane Pads

Vibration dampening

30-70 OO

Soft to Medium (Shore A)

Range: 20-70

4 items

Rubber Bands

Elastic applications

25 A

Door Seals

Weather stripping, gaskets

40-60 A

Automotive Tires

Traction and durability

60-70 A

Pneumatic O-rings

Low-pressure sealing

65-75 A

Hard Rubber (Shore A/D)

Range: 80-100 A / 30-50 D

4 items

Skateboard Wheels

Performance wheels

78-98 A

Hydraulic O-rings

High-pressure sealing

70-90 A

Ebonite Rubber

Hard rubber products

100 A

Solid Truck Tires

Industrial vehicles

50 D

Rigid Plastics (Shore D)

Range: 60-85

4 items

Hard Hats (HDPE)

Safety equipment

75 D

Cast Urethane

Industrial parts

80 D

Polycarbonate

Protective shields

83 D

Acrylic (PMMA)

Transparent covers

85 D
Material Selection Tool

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Technical Documentation

Complete Shore Hardness Guide

Everything you need to know about durometer testing and material selection

What is Shore Hardness?

Shore hardness is a standardized measure of a material's resistance to indentation. It was developed by Albert Ferdinand Shore in the 1920s and has become the industry standard for measuring the hardness of polymers, elastomers, and rubbers.

Key Concepts

  • Durometer: The instrument used to measure Shore hardness. It consists of a calibrated spring and an indenter that penetrates the material.
  • Scale Range: All Shore scales range from 0 (softest) to 100 (hardest), but different scales measure different material types.
  • ASTM D2240: The American standard that defines testing procedures and specifications for 12 different Shore scales.
  • Non-Destructive: Shore hardness testing is a non-destructive method, making it ideal for quality control.

Why Shore Hardness Matters

For Engineers

Predict material performance, select appropriate materials for applications, and ensure product consistency.

For Manufacturers

Quality control, batch consistency verification, and meeting customer specifications.

Frequently Asked Questions

Expert answers to common Shore hardness questions

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This tool follows ASTM D2240 standards and provides calculations based on established empirical relationships. For critical applications, always verify with laboratory testing.