0000248 Methane chemical_name:Methane component_formula:CH4 component_concentration:100% pipe_and_fittings_hdpe_pe100_20: + elastomeric_seals_nbr_20:1 elastomeric_seals_epdm_20:3 elastomeric_seals_fpm_20:1 elastomeric_seals_sbr_20:3 aps_id:0000248