4. Chemical Technology 5, Radio Technology 6, Metallurgical Technology
(2) Various kinds of materials
1. Metal materials: tungsten, molybdenum, copper, nickel, iron, mercury, zirconium and titanium, as well as tungsten-molybdenum, nickel-manganese, chromium-copper, Iron-Nickel-Cobalt alloys, and nickel-plated, gold-coated, silver-coated, zirconium-sprayed, titanium-sprayed, carbon-sprayed process composite materials.
2. Chemical materials: alcohol, butyl acetate, caustic sodium, barium nitrate, acetone, nitrocotton, etc.
3. Insulation materials: mica, ceramics, bakelite, quartz and glass, etc.
High cleanliness is the most important condition to ensure the quality of electronic tubes. Especially in cathode manufacturing and rack room, dust-proof level is higher. Employees must strictly abide by the vacuum hygiene system, such as washing hands, changing clothes, changing shoes, wearing hats, etc.
