Assembly Instructions

Safety Precautions

Before applying cement, appropriate safety precautions should be taken. Solvent cement should be stored in the shade between 40°F and 110°F. Eliminate all ignition sources. Avoid breathing of vapors. Use only with adequate ventilation; mechanical ventilation or local exhaust is recommended to maintain vapor concentrations below exposure limits. In confined or partially enclosed areas an organic vapor respirator is recommended. Containers should be kept tightly closed when not in use, and covered as much as possible when in use. Avoid frequent contact with skin. Wear clean rubber gloves; do not perform work with bare hands.

Component Preparation

All pipe, fittings and tools used for joining must be clean and free of dirt, moisture, grease or other contamination prior to and during the joining process..

Cutting Blue Deionized Water Pipe 1 - Cutting
Cutting the pipe as squarely as possible (90°) is required, as it maximizes the bonding area of the joint. Only sharp wheel-type cutters with blades specifically designed for cutting plastic shall be used. Cutters should be rotated slowly to provide optimum cut. Cutting speeds should be further reduced at lower temperatures. The use of a saw is not recommended as filings and shavings will cause particulate contamination.
Deburring Pure Water Piping 2 - Deburring
All pipe ends shall be properly chamfered by providing a 10° to 15° bevel (1/16" to 3/32" in width). A chamfering tool designed for this purpose shall be used. A proper bevel will aid in assembly and prevent solvent cement being pushed from the wall of the fitting during assembly. Burrs and filings can prevent contact between the pipe and fitting and must be removed from the outside and inside of the pipe during this process. A common practice is to place sterile gauze in the pipe end to prevent shavings from entering the pipe. The gauze is then removed prior to cement application.
Connecting Water Pipes 3 - Joining Preparation
Prior to assembly, all components shall be inspected for any damage or irregularities. Mating components shall be checked to assure that tolerances and engagements are compatible. Do not use components that appear irregular or do not fit properly. Check the dry fit – The pipe should enter the fitting socket easily one-quarter to three-quarters of the way. If the pipe bottoms in the fitting with little interference, use extra solvent cement in making the joint. Measure the socket depth of the fitting and mark this distance on the pipe end. This reference mark can be used when joining to ensure the pipe is completely bottomed into the fitting during assembly.
Cement app 4 - Solvent Cement Application
Harvel LXT® One-Step Cement shall be applied to the joining surfaces using a dauber or natural-bristle brush approximately half the diameter of the pipes being joined. Working quickly, apply a heavy, even coat of solvent cement to the pipe end on the surface equal to the depth of the fitting socket. Apply a light coat to the fitting socket. If there was little interference during the dry fit, apply a second coat of cement to the pipe end at this time. Great care must be used to prevent cement from coming into contact with the interior waterway of the fitting or pipe.
Pure Water Pipe Assembly 5 - Assembly
Immediately insert the pipe into the fitting socket while rotating one-quarter turn. Properly align the fitting for the installation at this time. The pipe must bottom completely to the fitting stop. Hold the assembly for approximately 30 seconds to ensure initial bonding. Due to the taper on the interference fit, the pipe can back off the fitting stop if steady pressure is not held on the joint during initial bonding. A bead of cement should be evident around the pipe and fitting juncture. If the bead is not continuous, it may indicate that insufficient cement was applied. Due to the unique translucency of Harvel LXT®, visual inspection of the cemented joint can be conducted utilizing a flashlight or alternate light source. Joint integrity can be readily verified by visually inspecting the cemented surfaces for uniformity. If insufficient cement is applied, the joint must be cut out, discarded and begun again. Excess cement must be wiped off from the pipe OD using a clean rag at this time.

Set and Cure Times

Set and cure times are a function of pipe size, temperature, pressure, humidity and tightness of fit. The initial set time is the recommended waiting period prior to handling a newly assembled joint. After the initial set time, the joints will withstand the stresses of normal installation. (Misalignment of components during assembly will cause excessive stress in the joint, which can affect joint integrity). The cure time is the recommended waiting period prior to pressurizing newly assembled joints. Minimum cure time prior to pressure testing is dependent on pipe size, temperature, humidity, tightness of fit and test pressure required. Longer cure times must be allowed when working at higher humidity and colder temperatures. Refer to the following tables for minimum set and cure times.

Initial Set Time

Temp Pipe Size
1/2 - 1 1/4
Pipe Size
1 1/2 - 2
Pipe Size
2 1/2 - 6
60° - 100° F 2 min 3 min 30 min
40° - 60° F 5 min 8 min 2 hrs
0° - 40° F 10 min 15 min 12 hrs

Joint Cure Schedule

Relative Humidity
60% or less*
Pipe Size
1/2 - 1 1/4
Pipe Size
1 1/2 - 2
Pipe Size
2 1/2 - 6
Temp Range during
assembly and cure periods
up to
160 psi
160 to
370 psi
up to
160 psi
160 to
315 psi
up to
160 psi
60° - 100° F 15 min 6 hrs 25 min 12 hrs 1 - 1/2 hrs
40° - 60° F 20 min 12 hrs 30 min 24 hrs 4 hrs
0° - 40° F 30 min 48 hrs 45 min 96hrs 72 hrs

If damp or humid weather allow 50 percent longer cure times.

Flange Installation

  1. Solvent cement flange to pipe.
  2. Piping runs joined must be installed in straight-line position to the flange and supported to avoid stress and damage.
  3. Rotate ring into position with gasket in place to align holes.
  4. Insert all bolts, washers and nuts.
  5. Mating surfaces of flanges must be flush against gasket prior to bolting.
  6. Tighten by hand until snug. Tighten bolts in 5 ft.-lb. increments according to opposing sequence shown below.
  7. Do not use bolts to bring improperly mated flanges together.
Size (in)
1/2 - 2 12 ft.-pounds
2 - 4 25 ft.-pounds
6 40 ft.-pounds


Bolt torque sequence


Installation Notes

Installers should verify for themselves that they can make satisfactory joints under varying conditions. Use the appropriate size applicator. Avoid puddling of solvent cement on or within fittings and pipe. This will cause excessive softening of materials, resulting in damage to the product and excessive system contamination.

Harvel LXT solvent-cemented assemblies cure very quickly when properly constructed, enabling pressure-bearing capability in a short time. This is a positive attribute of the system for scheduling pressure tests and repair work. However, GF Piping Systems recommends that newly assembled systems be allowed to cure for a minimum period of 24 hours prior to system rinsing/activation procedures. This reduces the potential for TOC contamination. Harvel LXT piping products should not be connected directly to UV light sources that can expose system components to ultraviolet radiation. Contact GF technical support for additional information at (610) 252-7355.