Dresser Gasket | 42 Buna N

Description Dresser Gasket — Grade 42 BUNA-N | Nitrile Gasket for Dresser Style 38, 40, 138 Couplings Grade 42 Nitrile (BUNA-N) | Oil & Hydrocarbon Resistant | Natural Gas Condensate | 212°F Maximum | Yellow Color Code Overview The Dresser Grade 42 BUNA-N Plain Gasket is the oil and hydrocarbon-resistant sealing element for Dresser Style 38, Style 40, Style 138, and related bolted couplings in pipeline service where the standard Grade 27 BUNA-S compound is chemically incompatible with the line content. Grade 42 is compounded from Nitrile Butadiene Rubber (NBR) — universally known as BUNA-N or Nitrile — which provides significantly superior resistance to petroleum hydrocarbons, aliphatic and aromatic solvents, oils, natural gas condensate, and fuel-related fluids compared to SBR-based compounds. It is the standard alternative to Grade 27 whenever the pipeline carries hydrocarbons rather than water or dry gas. Grade 42 maintains the same wedge-section profile, Shore A durometer,