34 Pa. Code § 307.14
MSDSs, educational and other materials shall be furnished by a nonmanufacturing employer upon request to an employe or employe representative at no cost to the employe or employe representative. If an employe making the request has requested and received the same information about the same substance within the preceding 12 months, the nonmanufacturing employer may impose a reasonable charge, not to exceed the costs of reproduction, for the information. No fee may be charged if a requesting employe's job assignment has changed or there is new information available concerning the subjects about which information is required to be provided. The nonmanufacturing employer may not charge fees for requests by a certified or recognized bargaining agent to the extent the person is acting in his capacity as a certified or recognized bargaining agent.
34 Pa. Code § 307.14