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What Is Glass Powder?

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  • Written By: Mary McMahon
  • Edited By: Nancy Fann-Im
  • Last Modified Date: 19 November 2016
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Glass powder is an extremely fine powder made from ground glass. It can be used in a number of industrial and craft applications and is often available through suppliers of glass and industrial supplies. High precision machining equipment is necessary to prepare it, as it needs to be very uniform, with an even consistency. Costs vary, depending on the level of grind and the applications.

Some companies use recycled glass to make their glass powders, while others may use specially made glass. The process can involve dry or wet grinding to achieve particles of the desired size. Pigments can be added to make colored glass powders, and companies can also work with colored glass if they want to make powders of a particular color, like blue. The finished product can be hazardous and must be handled with care.

One use for glass powder is in crafts like glass fusing and cloisonné, where crafters carefully apply the powder, subject it to high heat, and allow it to melt. The crafter can control the precise shading of color as well as the distribution of color for very distinctive and visually interesting pieces. Jewelry, vases, and a variety of other objects can be made with glass powder. Molds are available for mass production of some types of finished pieces.

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The early origins of glass powder in crafts can be hard to trace. Some African cultures were making power glass beads as early at 700 CE, while the famed glassmakers of Venice were readily applying the technology by the 1500s CE. Given the exchange of trade objects and ideas, it is possible that Venetian glassmakers picked up the skill from African trading partners, rather than inventing it independently.

Semiconductor manufacturers also use this product, as do some dentists, who can create very precisely matched fillings with the use of glass powder. These industrial powders are held to a higher standard of purity because their applications are more demanding. Companies need to handle and treat the glass with care throughout production to avoid introducing contaminants.

While handling glass powder, facial protection should be worn. The powder can irritate the eyes, nose, and mouth, so a full facial cover is important. It is also advisable to wear clothing that fits snugly and comfortably, and to cover garments with a smock or apron. If glass powder comes into contact with the skin, it can cause itching and discomfort.

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miriam98
Post 3

@NathanG - I’m surprised to hear that the use of glass powder goes back as far as it does. I would assume that there is a difference in the quality of the glass powder however.

What I mean is that glass powder is very fine, and I don’t think the ancients had the ability to make it fine. We have equipment that does that.

Maybe their powder was more gravel like and less fine. That’s my opinion. However, I could be wrong. The ancients built the pyramids, so maybe fine glass powder was not exactly outside of their capabilities.

NathanG
Post 2

@allenJo - Well, not all fillings and crowns are made of metal. Think of porcelain. That can break.

I guess it’s the way that they make it or the bonding that makes it strong. Maybe they add some additional material to the porcelain to make it strong so that it can be used as filling or a crown.

In the same way I can imagine that they might use tempered glass in the case of dental fillings. But I agree, I’ve never heard that application either.

allenJo
Post 1

I can appreciate the use of glass powder in semiconductor production, but I don’t think I’d like it used in dental fillings. Honestly that’s the first time that I’ve heard of this application, and it doesn’t really make much sense.

Glass is breakable. For fillings you want stuff that doesn’t break easily, like gold or steel, not glass and powder. Of course I am not a dentist so obviously there is something that I am missing here.

However in all the times I’ve gone to the dentist he never mentioned glass fillings as an option. Perhaps it’s used in rare, specialized instances.

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