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Author Topic: Backing material for turquoise??  (Read 478 times)

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vitzitziltecpatl

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Re: Backing material for turquoise??
« Reply #15 on: April 11, 2019, 08:43:44 PM »

If the back of the stone is extremely irregular, it will need to be filled to at least a point where you would have a flat enough surface to add the basanite/nephrite backing.

If coloring the epoxy, Hxtal is an unnecessary expense since it's just a type of epoxy that yellows less than others.

finegemdesigns

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Re: Backing material for turquoise??
« Reply #16 on: April 15, 2019, 12:17:46 AM »

Coefficient of thermal expansion is important since you would prefer to have 2 materials that are bonded together to expand and contract at the same rate with changes in temperature. Either that or you could have a binder like epoxy that sets up NOT rock hard like super glue does.  It could be possible to have turquoise break if it is bound with rock hard super glue to a material that has a highly different coefficient of thermal expansion.

I like to use black jade actinolite thin slabs with epoxy 330 since this epoxy has a very slight flexibility which allows for differences in thermal expansion.
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