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SHORE A - ANALOGUE HARDNESS DUROMETER

shore A Analogue

Scale Selection Guide

The durometer selection guide will help you select the appropriate Shore hardness tester for your application. The combination of spring force and indenter geometry per ASTM D 2240-04 (as defined by ASTM DIN 53505, ISO 7619-1 and ASTM D 2240) determines the type of durometer required for a particular application. There is not one type of durometer that can cover the entire hardness spectrum. When selecting a durometer it is important to take the readings into consideration (readings below 10 or above 90 are not considered reliable). In such cases the next appropriate scale should be chosen.

Scale of Durometer Material to be used Conforms to Maximum Force Indenter
A Rubber : soft vulcanized (ie tire), natural nitrile. Elastomeric Materials (rubber & rubber like); GR-S,GR-1, neoprene, Thiokol, flexible polyacrylic ester. Other : wax, felt, leather, etc. (materials that normally yield under fingermail pressure such as the heel on you shoe). ASTM D 2240
DIN 53505
821g Frustum cone
B Rubber: moderately hard (ie typewriter rollers, platens, etc.) ASTM D 2240
DIN 53505
821 g Sharp 30ºAngle
C Rubber: medium hard
Plastics : medium hard
ASTM D 2240
DIN 53505
4533 g Frustum Cone
D Rubber, Hard Plastics: harder grades such as rigid thermoplastics, plexiglas, thermopolystyrene, vinyl, sheet, cellulode acetate, thermosetting laminates (ie formica) other : paper filled calendar rolls, calendar bowls, etc. (materials that would not normally indent under fingermail pressure, such as a pocket comb) ASTM D 2240
DIN 53505
4533 g Sharp 30ºAngle
DO Textile Windings : very dense, slasher beams, etc. ASTM D 2240
DIN 53505
4533 g 0.0468 radius
E Soft rubber, sponges and foams ASTM D 2240
DIN 53505
821 g 0.0980 radius
O Rubber : soft (ie soft printer rolls, artgum)
Textile Windings : medium density (ie rayon, orlon, nylon)
ASTM D 2240
DIN 53505
821 g 0.0468 radius
OO Textile Windings : low density Other : sponge rubber and plastics (not for use on foamed latex) ASTM D 2240
DIN 53505
113 g 0.0468 radius
OOO Plastic Foams : suit foams, open or closed cells ASTM D 2240
DIN 53505
113 g 0.25 radius
OOO - S Plastic Foams : suit foams, open or closed cells ASTM D 2240
DIN 53505
113 g 0.25 radius
T Textile Windings : medium density (on spools and bobbins with a maximum diameter of 101.6mm 94in))
Note : all XT’s have a concave bottom plate to facilitate centering or round specimens
821 g 3/32 in sphere
M Rubber : o rings and thin sheet min 1.25mm (0.05 in) thick. Complete with stand ASTM D 2240
DIN 53505
78 g Sharp 30ºAngle

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