FreeShip- Aluminum Grain Filler, Coarse Angular, Exotherm Control, ~ 0.1 mm to 1 mm - (Contact to request actual ship cost for multi items)

$5.00+
Free shipping
$5.00
$7.00
$9.50
$5.00+
In stock
Ships next business day
Arrives from the United States
Returns accepted
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Item details

--> For other possible materials used as fillers: <--
https://www.etsy.com/shop/NorthernWestStuff?ref=hdr_shop_menu&search_query=filler

This is an ideal filler for anyone making large sized resin castings. It will help control the exotherm (heat created by chemical reaction as resins cure) of any casting material, usually resins like epoxy, but also polyesters and urethanes.
Originally marketed as an epoxy filler for pattern makers who make match plates and other types of patterns (and molds) used in conjunction with foundry casting. Over the years as thermosetting polymers improved, pattern makers started switching from materials like wood and metal to epoxy and urethane polymers. Epoxy and urethane as a casting materials for patterns were good because they had high strength, could be cast into large cross sections if steps were taken to control exotherm, were forgiving (mixing proportions could be adjusted so the 2 parts could be measured by equal volumes instead of weight), and of prime importance, they had practically zero shrinkage. Patterns made by casting could also be reproduced easily when they wore out by making molds of the "master pattern". Otherwise, each time a new pattern needed to be made it had to be laboriously cut from wood or cast from a metal and trued by machining (casting in metal made allowances for a shrinkage factor necessary as well, which was unnecessary with epoxy or urethane). In the long run, although the polymer was expensive, the labor was less, and costs were therefore less.
Many improvements were made to the working properties of epoxy as a pattern material, mainly in its ability to withstand relatively high temperatures during use when warm sand was packed against the patterns over and over each time a casting cycle occurred. High temperature resistance was improved in 2 ways: by improving the heat resistance of the epoxy resin itself, and by adding fillers that strengthened, hardened, added rigidity, and improved temperature conductance of the epoxy. Aluminum was an ideal filler because it did all those things, it conducts heat very well (many times better than polymers), adds hardness, rigidity, and further reduces the small amount of shrinkage inherent in any resin system. Used with fiberglass cloth (which improves stiffness better than aluminum) and a match plate was produced that could withstand a reasonably high number of cycles, stayed true, and was lighter than metal patterns. Another function was to reduce the very small amount of shrinkage epoxy resins
I used to have a pattern and molding shop and made a few match plates although my specialty was decorative patterns. I used this aluminum grain as an epoxy filler when placing the bulk of the epoxy in the match plate molds or even thicker sections in other types of epoxy molds. The first step would be to mix a finer aluminum powder or grit with epoxy and place a layer of that mix into the mold which would become the "outer" surface of the finished epoxy pattern or "masters". That was done so the outer surface would be smooth, without air pockets or bubbles. When that first layer gelled (transformed from a liquid/paste into a soft solid), a thin 2nd layer of aluminum powder filled epoxy was placed (for good adhesion for the 3rd layer), and immediately over that a 3rd layer was placed that had this coarse aluminum grain as the filler. The 3rd layer was a backing layer that was very highly filled and non-flowing (thicker than concrete). It was tamped into place. Its primary functions were to greatly improve heat conductivity, to reduce resin costs, and to help with rigidity due to the interlocking effect of these irregularly shaped aluminum grain particles as the backing fill. For really thick sections there were larger aluminum fillers available in the form of hollow spheres, "puffs", or "blobs".
There's a so-so Wiki article on patterns using in foundry casting here:
https://en.wikipedia.org/wiki/Pattern_(casting)
Larger quantities of this aluminum grain (and other aluminum fillers) can be found here:
https://www.freemansupply.com/products/fabrics-fillers-bagging/tooling-plastics-fillers/aluminum-fillers -
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-------------------------------> COMBINED SHIPPING <----------------------------------
Shipping cost will be reduced when buying multiple items that are small & light weight. To see total cost with actual shipping, mark the items you want as favorites, then message me with a request for actual shipping of your favorited items. Or, list your items in a message, requesting ship cost. I'll send you the cost & if you approve I'll make a reserved listing.
Or, just buy the items in your cart. I will do a refund for the ship overage as soon as I see your order. (Don't want to message me? I automatically check for ship overages, & will make a refund if applicable).
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FAQs

I'm sorry, but at this time we do not ship internationally.

If you would like a smaller or larger quantity of a raw material, click the "Request a custom order" button and tell us how much you would like. Or just contact us and let us know what you'd like. We'll get back to you ASAP.

This problem usually occurs with multiple items. Where possible, we're converting to calculated shipping. We originally didn't provide it because we sell so many dissimilar items (size, weight, etc), that it would not be possible to do it accurately. If your shipping cost is high, you can do one of the following: If you see "Request a Custom Order", "Contact", or "Ask a Question" on an item's page, you may use it to request a reserved listing. You may copy and paste a list of the items in your cart, send a screen shot of your items, or simply favorite them, and request a "reserved" or "custom" order. Or you may do nothing. We will see your multiple items & will always refund excess shipping charges before shipping your items.

If you have a technical question about an item we've listed, please don't hesitate to ask. We enjoy helping people out with a material or a process. We give anecdotal information in our listings if we have any. If you disagree with it or think we're being inaccurate or misleading please let us know that, too. If there are discrepancies in any of our listings let us know, we make mistakes like everybody and we'd like to be set straight and get those mistakes corrected.

I'm sorry, but at this time we do not ship internationally.

If you would like a smaller or larger quantity of a raw material, click the "Request a custom order" button and tell us how much you would like. Or just contact us and let us know what you'd like. We'll get back to you ASAP.

This problem usually occurs with multiple items. Where possible, we're converting to calculated shipping. We originally didn't provide it because we sell so many dissimilar items (size, weight, etc), that it would not be possible to do it accurately. If your shipping cost is high, you can do one of the following: If you see "Request a Custom Order", "Contact", or "Ask a Question" on an item's page, you may use it to request a reserved listing. You may copy and paste a list of the items in your cart, send a screen shot of your items, or simply favorite them, and request a "reserved" or "custom" order. Or you may do nothing. We will see your multiple items & will always refund excess shipping charges before shipping your items.

If you have a technical question about an item we've listed, please don't hesitate to ask. We enjoy helping people out with a material or a process. We give anecdotal information in our listings if we have any. If you disagree with it or think we're being inaccurate or misleading please let us know that, too. If there are discrepancies in any of our listings let us know, we make mistakes like everybody and we'd like to be set straight and get those mistakes corrected.



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