Use and precautions of Silicon Carbide Rod in the glass industry?
2026-03-27
In a glass furnace, as the molten glass flows through the cooling and homogenizing sections, it should be uniformly cooled to a temperature suitable for forming. If no measures are taken, the sides of the feeder channel will lose heat more rapidly than the central region.
Silicon Carbide Rod is widely used in the glass industry and serves as a critical heating element in processes such as glass melting, forming, and annealing. Made from high-purity silicon carbide through high-temperature sintering, it boasts excellent properties including high-temperature resistance, oxidation resistance, rapid heating, and long service life. Its normal operating temperature can reach 1450°C, and it can withstand continuous use in an oxidizing atmosphere for over 2,000 hours.
During the glass melting stage, Silicon Carbide Rods can provide a stable heat source for laboratories, pilot-scale lines, and small furnaces used to produce specialty glasses, particularly suitable for manufacturing high-purity products such as optical glass and pharmaceutical glass, thereby preventing combustion byproducts from contaminating the molten glass. In the forming process, Silicon Carbide Rods use radiant heating to regulate the temperature of the feed channel, ensuring that the molten glass cools uniformly to the desired forming temperature. For example, a five-section Silicon Carbide Rod (with a dual-heater configuration) can selectively heat both sides of the feed channel, compensating for heat loss from the side walls and preventing excessive temperature differences between the center and the edges of the molten glass, which could lead to inconsistent viscosity. Meanwhile, in the crucible area, gun‑type or groove‑type Silicon Carbide Rods are arranged around the crucible to provide circumferential heating, precisely controlling the droplet temperature and guaranteeing the quality of the formed glass container.
When using a Silicon Carbide Rod, please note the following: Before installation, test the cold-end resistance and match the rods; the resistance tolerance should be ≤0.2 Ω (for rods with a diameter of 12 mm or greater). The furnace hole diameter should be 1.4–1.6 times the outer diameter of the cold end to prevent obstruction from thermal expansion. For a new furnace, gradually increase the temperature to the rated power to avoid thermal shock and breakage. After prolonged use, the resistance will increase; adjust the voltage regulator or change the wiring configuration to maintain the desired power. Store the rods in a dry environment to prevent oxidation and delamination of the aluminum coating on the cold end. Never operate beyond the rated load, and if localized overheating or breakage occurs, replace the entire set.
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Precautions for Using Silicon Carbide Rod
Before installing the Silicon Carbide Rod, first check the resistance (Ω) marked on the cold end, then perform resistance matching; the resistance variation within each group should be within ±0.1. After the rod passes through the holes on both sides (or top and bottom) of the furnace wall, it should be able to rotate freely through 360 degrees, and forced installation or hammering must be strictly avoided.
Use and precautions of Silicon Carbide Rod in the glass industry?
In a glass furnace, as the molten glass flows through the cooling and homogenizing sections, it should be uniformly cooled to a temperature suitable for forming. If no measures are taken, the sides of the feeder channel will lose heat more rapidly than the central region.
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