Quick Details Names: methyl acetylene MF: C4H4 Model Number: 99% Place of Origin: Ningbo China (Mainland) Grade Standard: Electron Grade, Reagent Grade Purity: 99%min Appearance: Colorless Application: Synthesize, Fuel, Welding Brand Name: DSW DOT Label: 2.1 Product Details 99% Propyne Gas Cylinder Propyne (methylacetylene) is an alkyne with the chemical formula CH3CCH. It was a component of MAPP gas-along with its isomerpropadiene (allene), which was commonly used in gas welding. Unlike acetylene, propyne can be safely condensed. Product Introduction 99% Propyne/ Methyl Acetylene / C3H4 Chemical formula: C3H4 Molar mass: 40.0639 g/mol Appearance: Colorless gas Odor: Sweet Density: 0.53 g/cm3 Melting point: 102.7 C (152.9F; 170.5 K)