Stainless Steel Tile Molds

Stainless steel has a bit of a mythical place in the glass world, it’s great for molds, difficult to work with, expensive as all get out.

Some of these things aren’t true. Stainless can be easy to work with, and a very useful thing indeed. A few years ago, I had a client that wanted custom made recycled glass tile for her bathroom. The tile would be made with the wine bottles she saved up, which would be ground, filtered and the frit custom mixed to make colors, and then fused into tile shapes. Which meant I needed a bunch of custom sized tile molds. I had experimented with ceramic tile molds, which worked well, but were time consuming to make.

Since, conveniently, our kitchen garbage can pedal had just broken, I had some stainless steel on hand.

Although the manufacturer doesn’t say how thick the steel is, it feels somewhere in the 18-20 gauge. You can purchase sheet stainless steel online, and if you have a metals dealer in your area, perhaps even locally. And, if you ever see a stainless steel garbage can at a thrift store or yard sale, snap it up!!

So, to make your own tile molds, disassemble the garbage can and flatten out the steel the best you can. To make a tile mold, you’ll need:

stainless steel sheet for molds

A piece of stainless at least one inch larger all on every side than the tile. We are making a 2″ x 4″ mold today, so we need a 4″ x 6″ piece of stainless steel. First I’m going to square up the steel using my handy dandy square:

marking a square edge

Now that I have a square edge, I’ll measure in 1″ for the vertical side of the mold, then over 2″ for the bottom of the mold, and another 1″ for the other vertical side.

marking out the tile mold

And then use my square to extend the lines across the whole steel sheet. Notice that the right hand side of the metal isn’t cut perfectly straight. This is okay because it will end up being the top of the vertical side of the mold and won’t affect the tile at all.

marking the long sides of the mold

Now, I’ll mark the long side of the mold by measuring in 1″ for the vertical side, up 4″ for the tile part, and then another 1″ for the other vertical side.

marking the long side

and again extend all the lines:

Marked up tile mold

Now, using my Aviation Snips (no, I don’t know why they are called that), I’ll trim off the extra stainless steel:

Aviation Snips

Trimmed Tile Mold

Now, we need to create sloped vertical sides for the mold that well close neatly on the corners, yet allow some flexibility to allow the glass to expand and contract during firing. We’ll do that by cutting out the corners at an angle. Using your square, mark a point halfway between the corner of the tile mold and the next blue line:

Marking the corners

Do this for all four corners, on all four sides. Then draw a line from the intersection of the vertical and horizontal blue lines to the new marks (that sounds complicated, but it isn’t)

mark up the corner diagonals

See? Easy. Do the same thing for the other three corners:

marked corners of tile mold

Now, cut out that kite shaped section of each corner with the aviation snips:

cutting the corner of the tile mold

After all four corners are trimmed out, we’re going to fold up the sides of the tile mold. I recommend using gloves for this part, the cut edges of the stainless mold can me sharp.

Using a solid straight edge (I’m using my square), set the straight edge along one of the long sides of the tile mold, on the blue line. This edge will help you make a nice straight fold.

long side of tile mold

Keeping the square firmly in place, fold up the side of the tile mold. It doesn’t have to be completely vertical, we’ll adjust it a little later.

folded tile mold edge

Now do the same thing to the other long side. Once that is done, we’ll do the short sides. Now, you’ll notice that we can’t do the short sides just the same way, since the pointy bits of the long sides are in the way. So, I’ll use the corner of my square and fold it one bit at a time:

folding the short side

And then the other short side:

folding short sides

Now, all four sides should be sorta vertical.

folded tile moldStill with your gloves on, carefully fold each side so the corners touch, they won’t seal perfectly, but you can do a pretty good job:

stainless tile mold

And here’s the back:

back of stainless tile mold

These can now be kiln washed or sprayed with Boron Nitride and used to fuse recycled glass into tile. If the kiln wash doesn’t stick, you can try adding a drop of dish soap to your kiln wash, or run the tile molds through a firing empty, they will oxidize slightly and the kiln wash will stick better. Here is a picture of my molds mid use:

Filled Stainless Steel Tile Molds
Filled Stainless Steel Tile Molds 1″ x 6″
Stainless Steel Tile Molds
Stainless Steel Tile Molds

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