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Using Tape or Paste Sealants
                                                                  With Plastic Threads
                                                                                                                                                         TECH-2-No.111

                    Which Threaded Joint Sealant to Use?
                     • Tape sealants are more susceptible to improper installation
                     • Paste sealants are more likely to contain incompatible chemicals
                     • Either type – Paste or Tape - must be properly used but NEVER use both!
TECHNOLOGY UPDATE

                    Spears® Recommends a Compatible Paste
                    As long as the sealant is fully compatible with the plastic material, paste type
                    sealants are far less prone to installation error. Misapplication, frequent with the
                    use of tape sealants, cannot only produce leaks, but also frequently over-stress the
                    plastic threaded joint. The critical element is chemical compatibility. Some “pipe
                    dopes” and pastes contain chemicals that can produce stress cracking in plastics.
                    Spears® BLUE 75™ Thread Sealant has been specially formulated and tested for
                    use with plastic piping components. Simply apply to male threads.


                                                                                                                                             The Best Choice
                                                                                                                                            For Threaded Joints
                    The Problem with Using TFE Tape Sealants
                    Thread sealants are applied only to the male threads. With a paste, you simply need to be sure the threads are
                    fully covered, especially at the start. Any excess will be displaced between threads and spread evenly during joint
                    assembly. In contrast, TFE tape-type sealant remains as a build-up on the thread especially when tape is not pulled
                    tight into threads.. This creates a “wedging action” and stress to the joint during assembly. Tape is frequently over
                    applied. Excess tape significantly increases male thread diameter, additionally stressing the joint. Tape wrapped in
                    the wrong direction will bunch-up and create uneven sealing. Tape that is too thin will not provide sufficient sealing
                    unless over applied. Tape is quite slick and can result in inadvertent over tightening. Using tape and paste makes this
                    even worse! At the same time, tape application that fails to fully cover the starting end can result in threads
                    seizing prior to proper joint makeup and give a false sense of being tight. Attempts to additionally tighten a joint
                    in this situation can damage pipe or fittings.
                                                   If You MUST Use Tape Sealant, Use It Correctly!
                       Wrap Tape In Direction of                                             Hold end and pull tape                             Use a TFE Tape
                       Threads (clockwise for right-                                         tight into threads.                                Sealant with a
                       hand thread). Use ONLY 2-3                                                                                               minimum thickness
                       wraps of tape.                                                                                                           of 2.5 mil.




                       Joint Assembly:                                                                                                          Always cover end of ¿tting
                       Tighten threaded joints 1-2                                                                                              at the start to prevent
                       turns beyond ¿nger tight.                                                                                                thread seizing prior to
                       Avoid “backing up” the                                                                                                   proper joint makeup.
                       wrenched assembly. DO
                       NOT over-tighten.



                                                     Progressive Products From Spears® Innovation & Technology
                                                               SPEARS® MANUFACTURING COMPANY
                                                                         15853 Olden St., Sylmar, CA 91342
                                                               (818) 364-1611 • Visit our Web site: www.spearsmfg.com
                      © Copyright 2008 Spears® Manufacturing Company. All Rights Reserved. Printed in the United States of America 02/08.                     TECH-2-No.111

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  • 1. Using Tape or Paste Sealants With Plastic Threads TECH-2-No.111 Which Threaded Joint Sealant to Use? • Tape sealants are more susceptible to improper installation • Paste sealants are more likely to contain incompatible chemicals • Either type – Paste or Tape - must be properly used but NEVER use both! TECHNOLOGY UPDATE Spears® Recommends a Compatible Paste As long as the sealant is fully compatible with the plastic material, paste type sealants are far less prone to installation error. Misapplication, frequent with the use of tape sealants, cannot only produce leaks, but also frequently over-stress the plastic threaded joint. The critical element is chemical compatibility. Some “pipe dopes” and pastes contain chemicals that can produce stress cracking in plastics. Spears® BLUE 75™ Thread Sealant has been specially formulated and tested for use with plastic piping components. Simply apply to male threads. The Best Choice For Threaded Joints The Problem with Using TFE Tape Sealants Thread sealants are applied only to the male threads. With a paste, you simply need to be sure the threads are fully covered, especially at the start. Any excess will be displaced between threads and spread evenly during joint assembly. In contrast, TFE tape-type sealant remains as a build-up on the thread especially when tape is not pulled tight into threads.. This creates a “wedging action” and stress to the joint during assembly. Tape is frequently over applied. Excess tape significantly increases male thread diameter, additionally stressing the joint. Tape wrapped in the wrong direction will bunch-up and create uneven sealing. Tape that is too thin will not provide sufficient sealing unless over applied. Tape is quite slick and can result in inadvertent over tightening. Using tape and paste makes this even worse! At the same time, tape application that fails to fully cover the starting end can result in threads seizing prior to proper joint makeup and give a false sense of being tight. Attempts to additionally tighten a joint in this situation can damage pipe or fittings. If You MUST Use Tape Sealant, Use It Correctly! Wrap Tape In Direction of Hold end and pull tape Use a TFE Tape Threads (clockwise for right- tight into threads. Sealant with a hand thread). Use ONLY 2-3 minimum thickness wraps of tape. of 2.5 mil. Joint Assembly: Always cover end of ¿tting Tighten threaded joints 1-2 at the start to prevent turns beyond ¿nger tight. thread seizing prior to Avoid “backing up” the proper joint makeup. wrenched assembly. DO NOT over-tighten. Progressive Products From Spears® Innovation & Technology SPEARS® MANUFACTURING COMPANY 15853 Olden St., Sylmar, CA 91342 (818) 364-1611 • Visit our Web site: www.spearsmfg.com © Copyright 2008 Spears® Manufacturing Company. All Rights Reserved. Printed in the United States of America 02/08. TECH-2-No.111