{"id":3915,"date":"2015-01-30T11:31:52","date_gmt":"2015-01-30T10:31:52","guid":{"rendered":"http:\/\/astonseals.it\/?page_id=3915"},"modified":"2015-07-31T12:06:42","modified_gmt":"2015-07-31T10:06:42","slug":"hardness","status":"publish","type":"page","link":"https:\/\/astonseals.com\/en\/support\/hardness\/","title":{"rendered":"Hardness"},"content":{"rendered":"<p><img loading=\"lazy\" class=\"alignright size-medium wp-image-3254\" src=\"http:\/\/astonseals.com\/wp-content\/uploads\/2014\/04\/durometro-300x300.jpg\" alt=\"durometro\" width=\"300\" height=\"300\" srcset=\"https:\/\/astonseals.com\/wp-content\/uploads\/2014\/04\/durometro-300x300.jpg 300w, https:\/\/astonseals.com\/wp-content\/uploads\/2014\/04\/durometro-150x150.jpg 150w, https:\/\/astonseals.com\/wp-content\/uploads\/2014\/04\/durometro-1024x1022.jpg 1024w, https:\/\/astonseals.com\/wp-content\/uploads\/2014\/04\/durometro-36x36.jpg 36w, https:\/\/astonseals.com\/wp-content\/uploads\/2014\/04\/durometro-930x928.jpg 930w, https:\/\/astonseals.com\/wp-content\/uploads\/2014\/04\/durometro-60x60.jpg 60w, https:\/\/astonseals.com\/wp-content\/uploads\/2014\/04\/durometro-351x350.jpg 351w, https:\/\/astonseals.com\/wp-content\/uploads\/2014\/04\/durometro-75x75.jpg 75w, https:\/\/astonseals.com\/wp-content\/uploads\/2014\/04\/durometro-88x88.jpg 88w, https:\/\/astonseals.com\/wp-content\/uploads\/2014\/04\/durometro-600x600.jpg 600w, https:\/\/astonseals.com\/wp-content\/uploads\/2014\/04\/durometro-40x40.jpg 40w, https:\/\/astonseals.com\/wp-content\/uploads\/2014\/04\/durometro.jpg 1502w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/>We carry out measurements of hardness \u00b0ShA and \u00b0ShD according to DIN 53505 by impact with head measurement and a reading accuracy of 0.5 units of hardness.<\/p>\n<p>Standard measurement of elastomer hardness are:<br \/>\n<strong>IRHD<\/strong>\u00a0(International Rubber Hardness Degrees), <strong>BS<\/strong> (British Standard)\u00a0degrees and\u00a0<strong>Shore A<\/strong> Durometer.<br \/>\nThe first two are identical, however, Shore A Hardness may be measured as an instantaneous reading or as a 30 second reading. In the former case the value obtained is about 5 degrees higher than IRHD.<\/p>\n<p>The hardness of any elastomer can be modified by compounding. Hardness is thus a control factor in the formulation of an elastomer for specific applications. Hardness values used for seal materials may range from as soft as 40 to 50 \u00b0ShA up to a very hard compound of 95 \u00b0ShA hardness.<\/p>\n<p>Hardness (and therefore friction) is also affected by swelling. Swelling tends to reduce hardness and at the same time will increase the squeeze.<\/p>\n<p>Similarly, hardness is affected by temperature, decreasing with increasing temperature, and vice versa.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>We carry out measurements of hardness \u00b0ShA and \u00b0ShD according to DIN 53505 by impact with head measurement and a reading accuracy of 0.5 units of hardness. Standard measurement of elastomer hardness are: IRHD\u00a0(International Rubber Hardness Degrees), BS (British Standard)\u00a0degrees and\u00a0Shore A Durometer. The first two are identical, however, Shore A Hardness may be measured&hellip;<\/p>\n","protected":false},"author":4,"featured_media":0,"parent":3798,"menu_order":64,"comment_status":"closed","ping_status":"open","template":"","meta":[],"_links":{"self":[{"href":"https:\/\/astonseals.com\/en\/wp-json\/wp\/v2\/pages\/3915"}],"collection":[{"href":"https:\/\/astonseals.com\/en\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/astonseals.com\/en\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/astonseals.com\/en\/wp-json\/wp\/v2\/users\/4"}],"replies":[{"embeddable":true,"href":"https:\/\/astonseals.com\/en\/wp-json\/wp\/v2\/comments?post=3915"}],"version-history":[{"count":5,"href":"https:\/\/astonseals.com\/en\/wp-json\/wp\/v2\/pages\/3915\/revisions"}],"predecessor-version":[{"id":5134,"href":"https:\/\/astonseals.com\/en\/wp-json\/wp\/v2\/pages\/3915\/revisions\/5134"}],"up":[{"embeddable":true,"href":"https:\/\/astonseals.com\/en\/wp-json\/wp\/v2\/pages\/3798"}],"wp:attachment":[{"href":"https:\/\/astonseals.com\/en\/wp-json\/wp\/v2\/media?parent=3915"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}