EPA Region 1 has a requirement for the title product to be supplied as described herein. The EPA believes that the National Institute of Standards and Technology is currently the only source for the product(s) stated herein. If you disagree with this statement please respond to the point of contact listed above with the name of the vendor and the source of the product(s). Standard Reference Material 1800b Eighteen Non-Methane Hydrocarbon Compounds in Nitrogen (Nominal Amount-of-Substance Fraction – 5nmol/mol) This Standard Reference Material (SRM) is a primary gas mixture that the amount-of-substance fraction expressed as concentration (1), may be related to secondary working standards. The SRM is intended for the calibration of instruments used for non-methane hydrocarbon compound (NMHC) determinations and for the development and evaluation for methods used for air monitoring measurements. This SRM mixture is supplied in a DOT 3AL specification aluminum (6061 alloy) cylinder with a water volume of 6L. Mixtures are shipped with a nominal pressure exceeding 12.4 MPa (1800 psi) which provides the user with 0.73 m³ (25.8 ft³) of usable mixture. The cylinder is the property of the purchase and is equipped with a CGA-350 brass valve, which is the recommended outlet for this NMHC mixture. Certified Value: This SRM mixture must be certified for individual MNHC concentration. The certified values, as noted in Table 1. Expiration of Certification: This certification is valid until 1 June 2010.

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