General Advice for the Cleaning of Glassware
Handle glassware carefully as most damage to laboratory glassware occurs during cleaning. Ensure that all safety precautions are taken when cleaning glassware including the wearing of eye protection and safety clothing where necessary.
Glassware should be washed as soon as possible after use to avoid caking of residue and it is important not to let soiled glassware dry out. If immediate cleaning is not possible, the glassware should be put to soak in water.
Hard utensils, wire brushes or bottle brushes with wire cores, should not be used for cleaning as they may scratch or score the surface of the glass causing weak spots in the glass. Scratched glassware is prone to breakage during freezing or heating. It is recommended that a sponge brush that is soft and flexible be used.
After washing, the glassware should be rinsed with tap water to remove any cleaning agent residue. After the tap water rinse, the glassware should be rinsed with distilled or deionized water.
Dry the glassware inverted on racks or pegboards. Inspect the glassware for chips, cracks and scratches on the inside and outside. Do not use glassware with visible signs of damage.
Cleaning of Glassware used with Common Laboratory Chemicals
Suggested Cleaning Procedure for Sintered Discs
|Hot concentrated Sulphuric acid, Silver-chloride, Ammonia or Sodium hyposulfite
|Hot Hydrochloride acid plus potassium chlorate
|Hot Nitric acid
|Hot aqua regia
|Hot hydrochloric acid or hot ammonia
|Grease, Oil, fatty materials
|Hot concentrated cleaning solution, or hot concentrated sulfuric acid plus a few drops of sodium or potassium nitrite
|Carefully heat to approx. 200°C with mixed acid (5% H2SO4 and 1% HNO3)