08 TECHNICAL INFORMATION | PRODUCT-SPECIFIC SECTION
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). See general part. 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 ΔT = 100 K. 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.
Laboratory bottles with plastic coating
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 380nm (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 contact. 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 sterilisation at + 121°C or + 134°C • The cycle duration should not exceed 20 minutes.
(See also general section)
When sterilising, the screw cap should only be loosely applied (max. one turn – do not tighten), or use a membrane cap that allows pressure equalisation.
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