At present, dust-free workshops generally choose terrazzo air with good integrity and strong rigidity. In order to prevent the accumulation and breeding of dust and bacteria in the air, cracking and moisture regain should be avoided. In construction, measures such as compacting backfill soil, thickening floor, selecting high-quality cement (cement mark of cement mortar base must not be less than 425), proper reinforcement (for large-scale factory buildings) and so on can be taken to avoid air cracking; in order to avoid air moisture regain, thickening coagulation can be adopted in construction. Soil and gravel layers, high humidity areas to increase waterproof layer (such as felt oil) and other measures. The whole floor of polyester mortar can be used in the air with anti-corrosion request. It is made of corrosion-resistant unsaturated polyester as adhesive and quartz sand or barite sand as filler. It can resist acid and alkali, and has good chemical stability and corrosion resistance. The following air surface layers are commonly used in pharmaceutical factories.
(1) Terrazzo air: good integrity, lubrication, not easy to dust, washable and anti-static; defect is inelastic. It is often used in packing workshop, needle tablet workshop, laboratory, bathroom, dressing room, crystallization section and so on.
(2) Plastic air: lubricated, slightly elastic, not easy to dust, easy to scrub and clean, wear-resistant, corrosion-resistant, but easy to generate static electricity, easy to aging by ultraviolet radiation. Therefore, it is not suitable to be used in places where ultraviolet lamp is often used for sterilization. Usually used in dressing rooms, packaging rooms, laboratories and other rooms. Because of the different expansion and contraction properties of plastic slab and concrete base, it is not suitable for large-area workshop, otherwise it will cause shell phenomenon.
(3) acid-proof ceramic board in the air: it can resist corrosion by pasting with acid-proof cement, but its quality is brittle, it can not withstand impact, and its corrosion resistance is reduced after crushing. This kind of air can be used in the corrosive medium section of the raw material workshop. Because of its complex construction and high cost, it is suitable for some areas where the corrosive medium drips out. For example, equipment with corrosive media will be centralized, and then this part of the air will be surrounded by a water retaining line, which will be laid in the air inside the water retaining line.
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