GF Harvel EnviroKing®UV is compatible with conventional IPS size PVC pipe, fittings, and valves and can be joined via the two-step solvent cement and primer joining process, providing a quick, strong, leak-tight seal. For optimum joint integrity, GF Harvel recommends the use of a medium-bodied, fast-setting PVC solvent cement in conjunction with a PVC primer, such as IPS Weld-on 705 Clear cement and IPS Weld-on P-70 Clear primer.
The solvent-cemented connection in thermoplastic pipe and fittings is the last vital link in a plastic pipe installation. It can mean the success or failure of the system as a whole. Accordingly, it requires the same professional care and attention that are given to other components of the system. There are many solvent cementing techniques published covering step by step procedures on just how to make solvent cemented joints. However, we feel that if the basic principles involved are explained, known and understood, a better understanding would be gained as to what techniques are necessary to suit particular applications, temperature conditions, and variations in size and fits of pipe and fittings. Click here for more information.
BEFORE APPLYING PRIMER AND CEMENT, appropriate safety precautions should be taken. Primer and cement should be stored in the shade between 40°F and 110°F. Eliminate all ignition sources. Avoid breathing vapors. Use only with adequate ventilation; explosion-proof general mechanical ventilation or local exhaust is recommended to maintain vapor concentrations below recommended exposure limits. In confined or partially enclosed areas, a NIOSH-approved organic vapor cartridge respirator with full face-piece 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; wearing PVA coated protective gloves and an impervious apron are recommended. Avoid any contact with eyes; splash proof chemical goggles are recommended. (Please refer to Safety, Basic Principles, and Getting Started sections prior to use). Verify expiration dates stamped on cements and primers prior to use.
Component Preparation: Condition the pipe and fittings to the same temperature conditions prior to use. 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.
Cut ends of pipe square using appropriate tools. To ensure the pipe is cut square, a miter box must be used when using a saw. Cutting the pipe as squarely as possible provides the surface of the pipe with a maximum bonding area. GF Harvel EnviroKing®UV pipe can be easily cut with a wheel-type plastic tubing cutter, a power saw, or a fine toothed saw. Care must be taken not to split the pipe if a ratchet type cutter is used, especially in temperatures below 50°F. If any indication of damage or cracking is evident, cut off at least two (2) inches beyond any visible crack. It is important that the cutting tools used are designed for use on plastic pipe; refer to plastic piping tools section.
Burrs and filings can prevent contact between pipe and fitting during assembly, and must be removed from the outside and the inside of the pipe. A chamfering tool or file is suitable for this purpose. A slight bevel shall be placed at the end of the pipe to ease entry of the pipe into the socket and minimize the chances of wiping solvent cement from the fitting. Place a 10° to 15° bevel approximately 1/16" to 3/32" in width on the end of the pipe.
3. Joining Preparation
A. Inspect & Clean Components - 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. Contact the appropriate manufacturer of the component product in question to determine usability. Using a clean, dry rag, wipe loose dirt and moisture from the fitting socket and pipe end. Moisture can slow the cure time, and at this stage of assembly, excessive water can reduce joint strength.
B. 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.
C. Measure the socket depth - 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.
D. Position the pipe and fitting for alignment.
4. Primer Application
Primer must be used to prepare the bonding area for the addition of the solvent cement and subsequent assembly. GF Harvel recommends the use of IPS-Weld-on P-70 clear primer or equivalent for use with EnviroKing®UV piping. It is important to use a proper applicator. A dauber, natural bristle brush, or roller approximately 1/2 the size of the pipe diameter is appropriate. A rag must NOT be used. Primer must be applied to both the pipe and fittings. Apply Primer to the fitting socket, then to the outside of the pipe end, then a second coating to the fittings socket, re-dipping applicator as necessary to ensure entire surface is wet. Repeated applications may be necessary.
5. Solvent Cement Application
GF Harvel recommends the use of a medium bodied, fast-setting clear PVC solvent cement such as IPS Weld-On 705 Clear or equivalent. The solvent cement shall be applied when the pipe and fittings are clean and free of any moisture and debris, and must be applied immediately while primer is still tacky. Cement shall be applied to the joining surfaces using a dauber, natural bristle brush, or roller approximately 1/2 the size of the pipe diameter. Apply a heavy, even coat of cement to the outside pipe end to equal to the depth of the fitting socket. The amount should be more than sufficient to fill any gap. Apply a medium coat to the fitting socket. Avoid puddling. If there was little or no interference when the dry fit was checked, a second application of cement should be made to the pipe end.
While BOTH SURFACES are STILL WET with solvent cement, immediately insert the pipe into the fitting socket while rotating the pipe 1/4 turn. Pipe must bottom completely to the fitting stop. Properly align the fitting for installation at this time. 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 this bead is not continuous around the socket shoulder, it may indicate that insufficient cement was applied. If insufficient cement is applied, the joint must be cut out, discarded and begun again. Cement in excess of the bead can be wiped of with a rag.
7. Set and Cure Times
Solvent Cement set and cure times are a function of: the cement type used, pipe size, temperature, relative humidity, and tightness of fit. Drying time is faster for drier environments, smaller pipe sizes, high temperatures and tighter fits. The assembly must be allowed to set, without any stress on the joint, for 1 to 5 minutes depending on the pipe size and temperature. Following the initial set period the assembly can be handled carefully avoiding stresses to the joint. All solvent-cemented assemblies must be allowed to cure properly prior to pressure testing. Refer to solvent cement manufacturers set and cure schedule prior to testing, and GF Harvel's suggested set and cure time, detailed solvent cementing information, and testing section for additional information.
* The General step-by-step instructions provided herein are based on the use of conventional Schedule 40 PVC fittings used to join GF Harvel EnviroKing®UV piping under normal installation conditions and cannot be construed as covering every possible combination of field conditions. Click here for additional detailed information on proper solvent cementing procedures.