REFFLEX® capillary tubing and fittings are suitable for almost all non-corrosive refrigerants including natural gasses.
- HFC/HFO refrigerants
such as R134a, R404A, R407A, R407C, R407F, R449A, R513A and R1234ze
- HC refrigerants
such as R290 (propane), R600 (butane) and R600a (isobutyl)
- Natural refrigerants
such CO2 SUBcritical.
We are working on tubes applicable to CO2 TRANScritical.
REFFLEX® does not unconditionally support the application of copper gaskets. However, if required, they are part of our assortment.
Without using a copper gasket, the usual REFFLEX® DN-2.0 brass-to-brass or DN-5.0 steel-to-brass connection (e.g. the connection to a pressure switch, manometer, compressor valve service port or oil level system) is perfectly safe and 100% gas- and liquid-tight.
Of course the surface of the fitting on the equipment to be connected with must be smooth. Only would the surface clearly show scratches and/or other irregularities, the copper gasket might be required.
Please realise that some well-known disadvantages of copper gaskets are: The soft copper gets flattened during tightening the nut, the gasket’s outside diameter grows larger, and copper gets inside the thread of the nut. The inside diameter grows smaller and may even substantially block the orifice of the fitting or disable the proper function of the access valve depressor (if applied)
During tightening the flare nut one may see the REFFLEX® fitting rotate a short distance along with the flare nut. Unscrew the flare nut over one or two full revolutions. Manually rotate the fitting counter clockwise as far as it initially went along with the flare nut. Next finally tighten the flare nut. Doing so radial tension (torque) in the hose is avoided and now both matching surfaces fit perfectly together.