Principles of using laboratory glassware SIMAX
The laboratory glassware can be cleaned either manually or in a laboratory dish washer using usual cleaning and disinfecting agents. It is recommended to wash the glass before the first use. Laboratory glassware which came into contact with infectious substances should be cleaned and sterilized with hot air or steam. In this way, burning-on of impurities and damaging of glass by possibly adhered chemicals is prevented.
A) Manual cleaning:
- Laboratory glassware should be wiped and washed with a cloth or a sponge using a cleaning solution.
- Do not use abrasive washing agents as they can scratch the glass.
- Avoid extended exposition to alkaline media at temperatures above 70 °C as printing can be destroyed.
B) Washing in dish washers:
Washing of laboratory glassware in dish washers is more considerate than manual cleaning. The glass gets into contact with a cleaning solution for a relatively short time only during the phase of rinsing when the solution is sprayed on the glass surface.
- When inserting the glassware into a dish waster care should be taken to prevent mutual impacts.
2. Safety instructions for user
- Never expose the laboratory glassware to sudden changes in temperature. Prevent taking hot glassware out of a drier and putting it on a cold or wet laboratory table. The warning is particularly applicable to
a thick-walled glassware, such as suction flasks or desiccators.
- Before each evacuation or pressure stress of glass flasks, make visual inspection of a faultless state (for heavy scratches, impacts, etc.). Damaged glass flasks must not be used for works under pressure or
- The laboratory glassware under pressure or vacuum should be handled with care (e.g. with suction flasks, desiccators).
- Do not expose the glassware to sudden changes in pressure.
- To prevent developing stress in the glass do not heat up glass flasks under vacuum or pressure from one side or with an open flame.
- The laboratory glassware with flat bottom (e.g. Erlenmeyer flasks, flasks with flat bottom) should not be exposed to pressure stress.
Laboratory bottles SIMAX
Laboratory bottles are made of the borosilicate glass 3.3. featuring excellent chemical properties and a high thermal resistance. They are chemically resistant and stable. After completion with a plastic pouring ring, they enable liquids to be easily poured out. All bottles of the volume 100 ml and higher have the samethread size, the screw cups can be mutually interchanged.
The bottle, pouring ring, and screw cup can be sterilized.
a) Freezing of substances
- Freeze the bottle in a skew position (about 45 °) and filled up to max. 3/4 (volume expansion).
- Temperature limit: –40 °C as plastic lids and pouring rings do not resist to lower temperatures.
b) Thawing of substances
- Thawing of a frozen material can be carried out by submerging the bottle into a liquid bath (temperature difference should not exceed 100 °C). The frozen material will thus be heated up uniformly from all sides and the bottle will not be damaged. Thawing can also be accomplished slowly from the top so that the surface is first liquefied and the material can expand.
- During sterilization, the screw cup can only lightly be fitted on the bottle (screwed with max. one rotation). Pressures are not equalized when the bottle is closed. The pressure difference created in this way can result in the bottle breakage.
d) Pressure resistance
- The laboratory bottles are not suitable for works under pressure or vacuum.