Welding Tips and Tricks

OTHER THAN THE OIL-RESISTANCE AND THE FLAME-RESISTANCE CHARACTERISTICS OF THE TWO HOSES, WHAT MAKES GRADE R HOSE ONLY USEABLE FOR ACETYLENE AND NOT PROPANE OR NATURAL GAS AND GRADE T USEABLE WITH ALL FUEL GASSES ??

Why are Grades R and RM for acetylene only?
For many years the prevalent fuel gas in the industry was acetylene. Acetylene has little or no adverse effects onrubber. Therefore, no requirements for fuel gas compatibility were initially specified in the RMA/CGA IP-7 standard.Due to enhanced performance or reduced cost, different types of fuel gases (propane, natural gas, MAPP,propylene, hydrogen, etc.) became popular. Many of these fuel gases are detrimental to certain types of rubber.With the use of these fuel gases, combining the wrong hose and fuelcould lead to premature hose failure, propertydamage and personal injury.

hope that helps! Derrick

Thanks Derrick. Explained what I needed to know.