08 TECHNICAL INFORMATION | PRODUCT-SPECIFIC SECTION
Accessories
Flat flange reactions vessels can be sealed by O-rings (see below) for use at positive and negative pressures up to max. 230°C (O-ring dependent).
Advantages:
• Easy to open • The lid does not stick, even after operation for long periods under vacuum and at high temperatures • Reduced need to grease contact surfaces The stainless steel quick release clamps with three holding segments are optimally designed to provide even distribution of contact pressure. The chromium nickel steel support comprising two clamping rods is designed for secure fitting of the reaction vessels or the lids in support bar. For example, if there is a need to change the lid or the vessel, this can be done without dismantling the entire apparatus.
Shape retentive O-rings
FEP seamlessly coated elastomer O-rings with silicone core Comprising an elastic, silicone core with a seamless FEP coating that encloses the ring. The combination of these high-quality materials ensures good elasticity in conjunction with outstanding chemical resistance. The chemical resistance of FEP (tetrafluoroethylene hexafluor-propylene copolymer) is equal to that of PTFE. Hence the material is resistant to almost all chemicals and is suitable for temperature from – 200°C to + 200 °C. Silicone (VMQ) O-rings These O-rings are made solely from silicone (VMQ) and therefore are highly elastic. Their chemical resistance, however, is reduced in comparison with FEP coated O-rings. Temperature resistance extends from – 50°C to + 230°C.
O-rings, transparent made of silicone (VMQ)
O-rings, red FEP coated
Elasticity/recovery
+
+ + + +
Temperature resistance Chemical resistance
+ + + + + + + +
+ +
Solvent resistance
Physiologically harmless
+ +
+ = good resistance + + = very good resistance
FILTERS AND FILTRATION APPARATUS
DURAN® filters and the corresponding filter plates are precision manufactured from DURAN® borosilicate glass 3.3 with its high chemical and thermal-shock resistance. They are entirely inorganic and inert in most circumstances. There are therefore no leachable organic or ionic species present that could otherwise contaminate the filtrates. They are ideal for separations, e.g. with strong acids or alkalis and can likewise be readily cleaned and reused. DURAN® filter products have a maximum operating temperature of + 450°C. DURAN® filtration vessels are specially optimised to the matching filtration apparatus (eg funnels with guko adapters) and are vacuum-tight due to their special geometry and high wall thickness. Their designs have been approved by the TÜV accreditation body and marked with the “GS” indication were appropriate; see specific products for details.
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