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Rapport 2414173 - October 2007 __________________________________________________________________ Table 5 : R744 compatibility with materials Material Compatibility Metals Aluminium Satisfactory Brass Satisfactory Copper Satisfactory Ferritic Steels (e.g. Carbon steels) Satisfactory but risk of corrosion in presence of CO and/or moisture, Cold brittleness. Stainless Steel Satisfactory Plastics Polytetrafluoroethylene (PTFE) Satisfactory Polychlorotrifluoroethylene (PCTFE) Satisfactory Vinylidene polyfluoride(PVDF) (KYNARTM) Satisfactory Polyamide(PA) (NYLONTM) Satisfactory Polypropylene(PP) Satisfactory Elastomers Buthyl (isobutene - isoprene) rubber (IIR) Non recommended, significant swelling. Nitrile rubber (NBR) Non recommended, significant swelling and significant loss of mass by extraction or chemical reaction. Chloroprene (CR) Non recommended, significant swelling and significant loss of mass by extraction or chemical reaction. Chlorofluorocarbons (FKM) (VITONTM) Non recommended, significant swelling and significant loss of mass by extraction or chemical reaction. Silicon (Q) Acceptable but strong rate of permeation. Ethylene-Propylene (EPDM) Acceptable but important swelling and significant loss of mass by extraction or chemical reaction. Lubricants Hydrocarbon based lubricant Satisfactory Fluorocarbon based lubricant Satisfactory 5.2.4. Water and R744 Figure 45 (from Danfoss technical literature) shows what the combination of water and R744 leads to. __________________________________________________________________________________________ SHERPHA PROJECT - Transcritical R744 Heat Pumps – Technician's Manual 40/62PDF Image | Transcritical R744 (CO2) heat pumps Technician's Manual
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