{"product_id":"gietzand","title":"Casting sand \/ moulding sand 25 kg","description":"\u003cp\u003eCasting sand, also known as moulding sand, Brussels earth or greasy earth, is an oil-bonded mineral mixture. You use it to make moulds for sand casting. With this technique, the original object stays intact. The sand withstands temperatures up to about 900 °C.\u003c\/p\u003e\u003ch2\u003eHow sand casting works\u003c\/h2\u003e\u003cp\u003eThe process step by step:\u003c\/p\u003e\u003col\u003e\n\u003cli\u003eMake a negative impression of every side of the object\u003c\/li\u003e\n\u003cli\u003eRelease all parts from the object\u003c\/li\u003e\n\u003cli\u003eReassemble the mould parts and fasten them together\u003c\/li\u003e\n\u003cli\u003eYou now have a hollow mould for molten metal\u003c\/li\u003e\n\u003cli\u003eLet everything cool down before removing the blackened sand\u003c\/li\u003e\n\u003c\/ol\u003e\u003cp\u003eAny leftover sand can go back into the bag. This technique only works with objects that release from the mould.\u003c\/p\u003e\u003ch2\u003eReuse and composition\u003c\/h2\u003e\u003cp\u003eYou can use moulding sand several times, as long as the binder still works. The composition determines whether a project succeeds. Things can go wrong in three ways: mixing with talcum powder, thermal stress that causes the oil to separate, and ageing of the product. That last one takes many years.\u003c\/p\u003e\u003cp\u003eSand that has become mixed with talcum powder is best not reused, and should not be mixed with fresh greasy earth either.\u003c\/p\u003e\u003ch2\u003eApplications\u003c\/h2\u003e\u003cp\u003eIn most cases, bronze and aluminium are the metals of choice. Keep an eye on the 900 °C upper limit. The sand is especially suited to smaller and simple shapes, such as medals or coins.\u003c\/p\u003e\u003ch2\u003eMaking your own moulding sand\u003c\/h2\u003e\u003cp\u003eWe don't recommend it, because the right composition is decisive for the result. Also bear in mind that the object to be cast must be able to release from the mould and must not be made of a moisture-retaining material. For a wax or damp clay model, casting sand is not the answer.\u003c\/p\u003e\u003ch2\u003eTime estimate\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eTwo production moulds: 3 hours on average\u003c\/li\u003e\n\u003cli\u003eCasting and cooling: 1 hour on average\u003c\/li\u003e\n\u003cli\u003eFinishing: depends on your own preferences\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eSpecifications\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eType:\u003c\/strong\u003e oil-bonded mineral mixture\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaximum temperature:\u003c\/strong\u003e approx. 900 °C\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 25 kg\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSuitable for:\u003c\/strong\u003e bronze and aluminium, smaller and simple shapes\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReuse:\u003c\/strong\u003e possible as long as the binder works\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Parrot Shopping","offers":[{"title":"Default Title","offer_id":57979093418367,"sku":"800000121DS","price":81.47,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0936\/5366\/4127\/files\/gietzand-vormzand-25-kg-inhoud-verpakking.jpg?v=1786655431","url":"https:\/\/parrotshopping.com\/en\/products\/casting-sand-moulding-sand-25-kg","provider":"Parrot Shopping","version":"1.0","type":"link"}