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Yuhua Fused Cast
The main causes of defects in glass products
Time：
Aug 08,2025
What are the factors that cause glass product defects due to forehearth bricks?
Bubble defects
Pores in poorly processed and laid forehearth bricks may contain gases. When the glass melt passes through the channel, these gases enter the glass melt, causing bubble defects.
Stone defects
Forehearth bricks ( AZS-33 ) U Deposits on the surface of the U-shaped trough (such as residual sand, scars) or erosion and shedding of surface scars may form stones.
Streak defects
Unprocessed or R Radius deviations in the forehearth bricks (electrofused bricks) cause misalignment and unevenness during installation, which may lead to poor glass melt flow and the formation of streaks. For example, rough surfaces in the electrofused brick U channels will affect and destroy the uniformity of the glass melt.
Scratch defects
Rough and uneven surfaces of forehearth bricks may cause scratches on the glass surface.
Due to these factors, many glass factories experience unstable glass product quality and defects within a certain period of time after firing and discharging materials, and it takes some time for the channel surface to be flushed and filled with glass melt before it can return to normal. Therefore, many glass factories use three bricks to form the U channel.
After years of research and exploration, Yu Hua Electrofused has invested a large amount of manpower, material resources, and financial resources in fine cutting and polishing. According to the channel U forehearth bricks R radius, special processing equipment for special-shaped ( U channel) forehearth bricks has been designed and manufactured, realizing the full processing of ( U channel) forehearth bricks and avoiding glass product defects caused by rough surfaces of forehearth bricks.
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