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Post by Brandon on Mar 14, 2016 15:33:58 GMT -5
Hi,
I recently purchased a 2 gallon set of Performance 65D and am having issues with it. Initially I did casting without heating my molds and was getting very very soft castings from it, even 4+ hours after demolding. I tried heating my molds, and that helped some, but there's still enough deformation when demolding my parts that it's permanently altering the castings. In all I've gotten some passable casts, but generally unuseable parts. Can anyone help me with this? (I sent a message through the contact button on the site but have yet to hear anything)
Thanks
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Post by carol - Alumilite Corp on Mar 15, 2016 11:45:17 GMT -5
Brandon,
Are you measuring the P65D by volume? It is important to follow directions below as the resins have been formulated to crosslink completely and altering the mix ratio or not an accurate measure or complete mix may leave uncured components in the cast piece that may leach out at a later time and could alter the casting. We recommend you mix at least a half an ounce of each side to ensure you have a proper mix ratio. If you measure out 1/4 of an ounce of A in one cup and 1/4 ounce of B in another and dump the A into the B you will be off ratio due to the residue left in the cup. Do not mix in the graduated measuring cups, those are for measuring, pour your A and B into a straight sided, smooth sided cup to make sure you have a proper/blended mix. Scraping sides well and bottom of your container. If it is not measured and mixed properly or exceedingly small amounts used the mix ratio can be altered leaving darker in color and resin that could remain soft (never harden).
The molds if small amounts need to be heated to around 130F, that helps the exothermic process give you a uniform and complete cure.
Regards,
Carol
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Post by Brandon on Mar 15, 2016 23:22:05 GMT -5
Hi Carol,
I will give these suggestions a shot. I was doing typically 5+ oz. a go, so I don't believe it's an issue of not using enough material, and I was measuring by volume as well. I was guilty of using a cup with ridges for mixing though so I'll try that.
Would the hardener product you sell do anything for the pieces that didn't get completely rigid?
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Post by mike on Mar 16, 2016 15:50:58 GMT -5
Unfortunately the Hardener product is used in conjunction with Alumisol or vinyl based products and not urethane chemistries ... so it won't help the way you are hoping.
And as Carol mentioned ... it is very important to mix that by volume and make sure to shake both the A & B prior to measuring.
Mike
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