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Frit melted into Glass is opaque not transparent

I bought some frit powder and remelted it in a ceramic mold at about 900 °C in a Lindberg tube furnace. My question is, why is it opaque and not transparent? Where can I purchase frit with known properties (mean particle size, melting point) and no organic additives?

Steve N [surname deleted for privacy by Editor]
- Little Rock, Arkansas

For glass or ceramic, look in a lab equipment supply catalog. If you need bigger, contact the manufacturer.

There are lots of metal frits, even stainless steel. Look under sintered metals.

James Watts
- Navarre, Florida

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