Descriptions of porcelain frit

Chemical Properties

1) Porcelain frit powder often is applied as a paste, and may be transparent or opaque when fired; vitreous porcelain frit can be applied to most metals. It has many excellent properties: it is smooth, hard, chemically resistant, durable, can assume brilliant, long-lasting colors, and cannot burn. Its disadvantages are its tendency to crack or shatter when the substrate is stressed or bent. Its durability has found it many functional applications: early 20th century advertising signs, interior oven walls, cooking pots, exterior walls of kitchen appliances, cast iron bathtubs, farm storage silos, and processing equipment such as chemical reactors and pharmaceutical chemical process tanks. Commercial structures such as gas stations, bus stations and even Lustron Houses had walls, ceilings and structural elements made of porcelain frit steel.

2) Color in porcelain frit is obtained by the addition of various minerals, often metal oxides cobalt, praseodymium, iron, or neodymium. The last creates delicate shades ranging from pure violet through wine-red and warm gray. Porcelain frit can be either transparent, opaque or opalescent (translucent), which is a variety that gains a milky opacity the longer it is fired. Different porcelain frit colors cannot be mixed to make a new color, in the manner of paint. This produces tiny specks of both colors; although the eye can be tricked by grinding colors together to an extremely fine, flour-like, powder.

Typical Applications

1) Architectural panels

2) Barbeques

3) Bath-tubs & shower trays

4) Hot water boilers

5) Cooker panels and ovens

6) Grills & pan supports

7) Microwave ovens

8) Washing machine drums and housings


Porcelain frit is the colorful result of fusing powdered glass to a substrate by firing, usually between 750 and 850 degrees Celsius. The powder melts and flows and hardens to a smooth, durable vitreous coating on metal, glass or ceramic.

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