Viper Nylog Blue is viscoelastic liquid derived from synthetic refrigeration oil, a non-hardening, non-drying fluid which bonds tenaciously onto many different substrates. Nylog Blue is completely miscible and compatible with virtually all refrigerants – including HFC, HFO and CO2 – that contain POE or PVE oil and base compressor oils. The product will not cause any system restrictions, fouling or failure. Nylog is used by OEMs and industry professionals worldwide.