{"title":"Butvar","description":"","products":[{"product_id":"butvar-b-76","title":"Butvar® B-76","description":"\u003cp data-mce-fragment=\"1\" style=\"text-align: left;\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eButvar\u003c\/span\u003e\u003cb data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\" id=\"lblProductName\"\u003e®\u003c\/span\u003e\u003c\/b\u003e\u003cspan data-mce-fragment=\"1\"\u003e B-76 is a thermoplastic, polyvinyl butyral resin. \u003c\/span\u003eButvar\u003cb data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\" id=\"lblProductName\"\u003e®\u003c\/span\u003e\u003c\/b\u003e B-76 is supplied in coarse powder form with an unlimited shelf life, which dissolves (albeit slowly) in a solution of either acetone or ethanol (amongst others). It sets when the solvent evaporates. It is mostly used nowadays in fossil preparation as a \u003cstrong\u003econsolidant\u003c\/strong\u003e, \u003cstrong\u003ea semi-matt varnish\u003c\/strong\u003e, a translucent but \u003cstrong\u003estrong filler material\u003c\/strong\u003e and less commonly as an \u003cstrong\u003eadhesive\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\" style=\"text-align: left;\"\u003eButvar B-76 as a filler material in fossil preparation: It can be combined with ground matrix to create a natural filler paste, which is rigid when set but easily dissolved or reworked. \u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\" style=\"text-align: left;\"\u003eIt is often best used as a field consolidant or mid-mechanical prep consolidant as it is easier to remove than Paraloid B-72. Butvar B-76 redissolves in acetone or ethanol much more readily than Paraloid B-72 if used as only a temporary consolidant.  The matrix isn't consolidated quite as firmly and adhesion with the specimen isn't as strong as with Paraloid B-72. This has it's advantages when working mid prep - the matrix can be consolidated for mechanical removal with an air scribe, but isn't too firmly set. \u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\" style=\"text-align: left;\"\u003eIf using as a varnish, Butvar B-76 has a more matt (much less shiny) appearance than Paraloid B-72 which is often desirable. In this sense, it is similar to Mowithal B30H.\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\" style=\"text-align: left;\"\u003eIt also has a higher glass transition temperature (62-72C) than Paraloid B-72, making it better suited to fieldwork in hotter climates or storage of specimens in warmer rooms (glass roof, conservatories, etc.). \u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\" style=\"text-align: left;\"\u003eSoluble in acetone, ethanol, xylene, toluene and more. For instructions of how to mix Butvar B-76 effectively \u003ca href=\"https:\/\/www.zoicpalaeotech.co.uk\/pages\/paraloid-b72-in-fossil-preparation\"\u003echeck out our article on mixing Paraloid B-72.\u003c\/a\u003e Whilst you might need to play around with the concentrations depending on your application, the principles of measuring and mixing are the same. Butvar B-76, however, may take longer to dissolve than you expect. The process can take several days.  \u003c\/p\u003e\n\u003cdiv data-id=\"1613207562680\" data-icon=\"gpicon-row\" class=\"gf_row\" id=\"r-1613207562680\" data-key=\"row\" data-label=\"Row\"\u003e\n\u003cdiv data-id=\"1613206516069\" id=\"c-1613206516069\" class=\"gf_col-lg-12 gf_column\"\u003e\n\u003cdiv data-extraclass=\"\" data-id=\"1613207562758\" data-icon=\"gpicon-row\" class=\"gf_row\" id=\"r-1613207562758\" data-key=\"row\" data-label=\"Row\"\u003e\n\u003cdiv data-id=\"1613206536626\" id=\"c-1613206536626\" class=\"gf_column gf_col-xs-12 gf_col-lg-1 gf_col-md-1 gf_col-sm-1\"\u003e\n\u003cdiv data-id=\"1613207562753\" data-ver=\"1.0\" data-icon=\"gpicon-icon\" class=\"element-wrap\" id=\"e-1613207562753\" data-key=\"icon\" data-label=\"Icon\"\u003e\n\u003cdiv data-exc=\"\" class=\"elm gf-elm-center gf-elm-center-sm gf-elm-center-lg gf-elm-center-md gf-elm-center-xs\"\u003e\n\u003cdiv class=\"gf_icon-wrap\"\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"ZOIC PalaeoTech","offers":[{"title":"50g","offer_id":39272797339711,"sku":"","price":8.95,"currency_code":"GBP","in_stock":true},{"title":"100g","offer_id":39272797372479,"sku":"","price":12.95,"currency_code":"GBP","in_stock":true},{"title":"250g","offer_id":39272797405247,"sku":"","price":19.95,"currency_code":"GBP","in_stock":true},{"title":"500g","offer_id":39272797438015,"sku":"","price":33.95,"currency_code":"GBP","in_stock":true},{"title":"1000g","offer_id":39272797470783,"sku":"","price":49.95,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0252\/4695\/7631\/products\/ButvarB76.jpg?v=1615995870"}],"url":"https:\/\/www.zoicpalaeotech.co.uk\/collections\/butvar\/consolidants-adhesives.oembed","provider":"ZOIC PalaeoTech Limited","version":"1.0","type":"link"}