What is the minimum schedule recommended for plastic pipe to be threaded?

The minimum schedule recommended for plastic pipe to be threaded is Schedule 80. This specification is important because Schedule 80 pipes have thicker walls compared to Schedule 40 pipes, which allows for greater strength and pressure resistance. When creating threads on plastic piping, the additional thickness of Schedule 80 provides a more reliable and durable threaded connection, reducing the risk of failure under pressure or during mechanical stress.

Using Schedule 40 pipes for threading is not advisable, as their thinner walls could lead to compromised structural integrity and unsealed connections, possibly resulting in leaks or pipe damage over time. Schedule 100 is often not referenced in common threading applications for typical plumbing uses, as it is designed for specialized circumstances and is not the standard used for regular threading procedures in plumbing. Therefore, Schedule 80 is the safest and most practical choice for threaded applications involving plastic pipe.