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Chemical contaminants in the air may affect the filter. The exhaust system of the electronic factory is in trouble, or the volatile and corrosive gases in the plant can cause fatal damage to the filter. A plant and a plant using hydrofluoric acid, in the top of the plant, a washing tower and special treatment of air mist, beyond 8 alkali solution to clean the mist in gas is discharged by the pH value, to meet emission standards. Under normal circumstances, the surrounding air inlet to breathe in the fresh air, the content of acid is almost negligible. However, sometimes the washing tower for alkali neutralization acid fog metering pump is broken, spray water solution pH value is less than 5, the exhaust air outlet from acid exceed the standard, if the suction port is close, then wind is air sucked into the acid, it will affect the filter. The volatile hydrofluoric acid and hydrogen fluoride on chemical fiber material, the filter has little effect, but the HEPA filter on the glass fibre influence their corrosion of glass and glass fiber, the reaction of silicon fluoride. We have observed HEPA filter filter, see a layer of gray white powder, the results of chemical analysis of F and Si elements of the material.

A factory had been serious acid effects of HEPA filter event. In the process of color picture tube coating, defects, need to use strong acid solution cleaning off the coating on the surface of the glass, sometimes more than from the waste acid, on the position of the normal air exit, and spread to the whole plant. Once, the mist will actually diffuse glass corrosion Workshop on the window into the frosted glass. The surface of hydrogen fluoride in indoor air due to eddy current effect outlet contact HEPA filter, glass fiber filter material rapid corrosion, caused the damage of HEPA leakage. We have encountered such a thing, HEPA filter just for less than a year, it was destroyed. And such a situation occurs when the purification equipment operation personnel, may not immediately find the operation of the production line of improper operation, can only be prevented in advance.

In many domestic enterprises in the production of color picture tube, only individual enterprises to adopt the new air conditioning system in the workshop to avoid hydrofluoric acid, hydrofluoric acid on the air conditioning system, especially on the filter damage. The above mentioned case just happened in the most secure new air conditioning system. The majority of enterprises to save energy, the same workshop is used in air conditioning system, most of the small part of air return, the factory hydrofluoric acid corrosion filter problem may be more severe. Here, we only said the damage of hydrofluoric acid on equipment, if considering it for operator injury, the air conditioning industry may need to re design the air conditioning system with hydrofluoric acid workshop.