TECHNICAL INFORMATION
26
BOTTLES
Laboratory bottles with plastic coating
Laboratory bottles
The coating of DURAN® Protect bottles is a resistant and transparent plastic coating based on a cross-linked copolymer. The coating adheres securely to the glass surface and fulfils the following functions: • Protects the glass surface against mechanical damage (scratch protection). • Holds the fragments together in the event of the glass breaking (splinter protection). • Minimises liquid loss if the glass breaks (protects against contents escaping and splash). • Absorbs UV rays up to a light wavelength of 380 nm (light protection). Recommendations • The plastic coating does not increase the pressure resistance. These bottles are not designed for pressure or vacuum applications. • If the plastic coated bottle breaks during use, the contents and the plastic coating are likely to come into content. A test for any interaction between plastic and contents should be carried out to ensure that the contents remain unchanged and can be further used. Temperature resistance Do not expose DURAN® protect bottles to open flames or direct heat, e.g. on a laboratory hotplate. The maximum operating temperature is +135 °C and thus the bottle is suitable for use in an autoclave. Long-term exposure to temperature (> 30 minutes) should be avoided. DURAN® protect bottles can be used for freezing to –30 °C and used in microwaves. Thermal and chemical stresses can result in coating discolouration. Autoclaving The following procedure, bearing in mind the maximum temperature resistance, is recommended: • Steam sterilization at +121 °C or +134 °C. • The cycle duration should not exceed 20 minutes at 15 psig. When sterilizing, the screw cap should only be loosely applied (max. one turn – do not tighten), or use a membrane cap that allows pressure equalization.
DURAN® laboratory bottles are chemically resistant and stable. The extensive range of original accessories includes screw caps for the widest possible range of applications. Alongside the standard PP screw cap for everyday laboratory use, further caps made from various plastics and having special properties are available. DURAN® laboratory bottles are completed by suitable pouring rings from different plastics, which enable drip-free working. As almost all GL 45 bottles of 100 ml capacity and above use the same thread size, screw caps and pouring rings are fully interchangeable. The bottles, pouring rings and caps are autoclavable/ sterilizable.
Properties Light protection • amber bottles are opaque up to 500 nm
• plastic coated bottles are opaque up to 380 nm • Application: storage of light sensitive substances
High thermal shock resistance Due to their temperature properties, the bottles are suitable for autoclaving and sterilizing. Because of the bottom geometry and the wall thickness, direct heating with an unshielded flame is not recommended. When using an electronic heating plate or water bath laboratory bottles should be heated gradually.
Recommendations Pressure resistance
DURAN® laboratory bottles are, with the exception of the pressure- resistant DURAN® pressure plus + bottles, in general not suitable for use under pressure or in a vacuum. DURAN® pressure plus + bottles are pressure resistant from –1 to +1.5 bar (overpressure) due to a modified geometry and increased wall thickness. Sterilization When sterilizing or autoclaving contents, the screw cap must only be loosely fitted (max. one turn). The contents may expand or boil causing a large pressure difference in a closed vessel, which may well result in explosive failure. Alternatively, a DURAN® membrane cap may be used. Pressure equalization takes place through the PTFE membrane, while at the same time the membrane cap can remain tightly closed, greatly reducing the risk of contamination. Cleaning Cleaning should be carried out manually in a soaking bath or automatically in a dishwasher. When cleaning in a dishwasher, load so that there is no glass-to-glass contact (especially the threads) to avoid chips or abrasions. Freezing substances Recommendation: The bottle should be frozen slanted at an angle of 45 °, filled to a maximum 3/4 (to enlarge the surface area) and dependent on the properties of any screw caps or other components used. For the blue PP screw cap the minimum temperature is – 40 °C. Alternatively the Premium screw cap can be used (min. working temperature: –196 °C). Thawing frozen substances Frozen contents can be thawed by immersing the bottle in a liquid bath while taking care that the temperature difference between the contents and the bath does not exceed T = 100K. This will ensure that the frozen material is warmed uniformly from every side without damaging the bottle. The contents can, however, also be thawed slowly from above, so that the surface melts first, allowing the material to expand.
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