Service temp. 33 Degree F -140 DegreeF. Not for use with compressed air or gases. Resists chemical attack by most acids, alkalies, salts, fungi and bacterial action. Non-toxic, odorless and tasteless. Resistant to cracking so it is machinable. PSI is based on water at 73 Degree F. Schedule 40 is for socket fittings only; threading is not a recommended practice. Schedule 80 pipe can be threaded. Painting is not required for indoor non-exposed installations. For outdoor installation where the piping may be exposed to significant sunlight, we recommend painting; two coats of a white or light-colored, water-base, outdoor latex paint provides added protection. Not U.V. stabilized.