This part sets out alternate requirements for testing and evaluation of products MSHA approves for use in gassy underground mines. It permits manufacturers of certain products who seek MSHA approval to use an independent laboratory to perform, in whole or part, the necessary testing and evaluation for approval. It also permits manufacturers to have their products approved based on non-MSHA product safety standards once MSHA has determined that the non-MSHA standards are equivalent to MSHA's applicable product approval requirements or can be modified to provide at least the same degree of protection as those MSHA requirements. The provisions of this part may be used by applicants for product approval under parts 18, 19, 20, 22, 23, 27, 33, 35, and 36. This rule is effective August 18, 2003.