Ratermann Manufacturing, Inc. Customer Service 1-800-264-7793 y Email [email protected] y Order Online at Web Store www.rmiorder.com 33A-11 KRYTOX™ COMPATIBILITY Compatibility with Elastomers and Plastics KrytoxTM is compatible with all elastomeric seal materials and engineering plastics. The limiting factor when using Krytox with any material is the thermal stability of the elastomer or plastic. Krytox performance lubricants are compatible with the following common elastomers and plastics: • Fluorosilicone • Ethylacrylate • Methyl Silicone • Viton® A Fluoroelastomer • Urethane • Hypalon® Synthetic Rubber • Hytrel® Polyester Elastomer • Butyl 325 • Neoprene WRT • Nycar 100 (Buna N) • EPT, Peroxide Cure • Nordel® Hydrocarbon Rubber • Delrin® Acetal • Zytel® Nylon • Vespel® • PTFE® Fluoropolymer • Kalrez® Fluoroelastomer* * 15–20 vol% swelling at high temperatures when immersed. Compatibility with Metals Because of their low surface tensions, Krytox lubricants easily wet metallic surfaces. Krytox lubricants are chemically inert and therefore have no adverse effect on metals when the temperature is below 288°C (550°F). Above 288°C (550°F), many alloy steels, stainless steels, and other metals such as aluminum alloy, titanium alloy, nickel alloy, and cobalt alloy can be used with Krytox. Compatibility with Oxygen At elevated temperatures and pressures, perfluoroalkylpolyethers are highly resistant to attack by gaseous and liquid oxygen. As a result, Krytox fluorinated oils have become preferred lubricants in the oxygen manufacturing industry and in those industries that use oxygen. Krytox oils do not react with gaseous oxygen under shock loading or with liquid oxygen (LOX), nitrogen tetroxide, or inhibited red fuming nitric acid in impact tests. LOX impact tests were conducted in accordance with Marshall Space Flight Center MSFC-Spec-106B. Other impact tests conducted at 214 J/cm2 (200 ft·lb/in2), according to the method described in ASTM Bulletin 250, also show no reaction. Krytox lubricants have also been evaluated by the West German Federal Institute for Materials Testing (Bundesanstalt fuer Materialpruefung, BAM) for reactivity with gaseous and liquid oxygen under pressure. Table 2 shows oxygen compatibility of Krytox lubricants. Nine months worth of bearings. Nine months worth of bearings with 18¢ worth of KrytoxTM. Typical Hydrocarbon Application Lubricant KrytoxTM Electric Motor 5 days 9 months 227°C (440°F), 1,750 rpm Heated Rolls 8 months 24 months 199°C (390°F), 5,000 rpm Textile Roll 1 month 24 months 225°C (437°F), 5,400 rpm Pressure Relief Valves 50% failures Less than 1% failures Paper Corrugating Machine $144,000 $3,000 Table 1 Life/Cost/Reliability Temperature, Oxygen Pressure, Impact Energy, Test Type °C (°F) MPa (psi) J (ft·lb) Test Result Ignition in gaseous 400 (752) 13 (1,886) No ignition oxygena Pressure drop in 99 (210) 0.7 (100) No pressure drop gaseous oxygen after 600 hr bombb Mechanical impact Ambient 98 (72) No reaction in in liquid oxygen 20 trialsc,d,e Mechanical impact Ambient 122 (90) No reaction in in liquid oxygen 10 trialsa Mechanical impact Ambient 736 (543) No reaction in in liquid oxygen multiple trialsf Table 2 Oxygen Compatibility of Krytox TM Lubricants a British Specification 3100. b American Society for Testing and Materials D942. c Marshall Space Flight Center Specification 106B. d National Aeronautics and Space Administration Handbook, 8060.1B, Test 13, Part 1. e American Society for Testing and Materials D2512. f West German Federal Institute for Materials Testing (BAM), 8104-411. DuPont™ Krytox™, and Vydax® are registered trademarks or trademarks of E.I. duPont de Nemours and Company DuPont™ Krytox™ Compatibility with Elastomers, Plastics & Oxygen
