Industrial terminology for glass products

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Various defects in glass products. The most common defects are stones, streaks, and bubbles.

"stone"

Stone is a non-glassy inclusion in the glass that not only destroys the appearance and optical uniformity of the glass product, but also creates additional force. Decreasing the mechanical strength and thermal stability of the glazing makes it difficult to retract the head and keeps the stone from entering the product.

There are many reasons to form a stone. Some of these are caused by adverse reactions and melting of the ingredients in the batch. Some of these are caused by hot glass erosion or soda ash flying in batches. The block falls into the glass solution, and part of the glass solution itself has too much oxide content and is caused by crystallization.

"stripe"

Stripes are glassy inclusions in glass that destroy the uniformity of the glass, affect its appearance, and reduce its mechanical strength, thermal stability, and chemical uniformity.

There are many reasons for streaking. Some are caused by insufficient melting of the batch and insufficient homogenization of the glass. Some of these are caused by refractory materials that are etched by the glass liquid at high temperatures and then enter the glass liquid. Some gems will initially dissolve in the glass liquid, but will not spread. During the melting process, a significant amount of certain components on the surface of the molten glass may also volatilize, producing “volatile stripes”.

"bubble"

It is the gas contained in the glass that affects the quality of the appearance and the mechanical strength of the glass.

The reason why bubbles are generated is that the glass is not fully transparent during the melting process, air is introduced into the powder, a large amount of gas is released from carbonates, sulfates, etc. To remain inside. Inside. There are secondary bubbles formed by glass during cooling, those formed by the interaction of glass and refractory, and those generated during molding operations.

Article Source: https://www.glass-factory.net/news/industrial-terminology-for-glass-products.html

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