Belled-end duct, couplings, flanges and other socket-style fittings can be joined using the solvent-cementing process. This process involves the application of a primer and solvent cement to join system components. This joining method has been used successfully for over 30 years in tough corrosive pressure applications. When properly conducted, this method provides a strong, homogeneous joining area in which the mating surfaces are chemically fused together, producing a strong, leak-tight seal when cured. Detailed solvent-cementing procedures are available and should be referenced for proper installation techniques. Adequate surface-to-surface contact of the parts being joined is necessary for reliable solvent-cemented joints. Generally, a minimum socket depth of 3" (all sizes) will provide sufficient joint strength for most systems. Since duct dimensional toleran-ces can be appreciable when compared to heavy wall pipe, the use of extra-heavy-bodied PVC cement (such as IPS 719 or equivalent) is recommended due to the cement’s excellent gap-filling properties. Care should be used when solvent-cementing duct diameters 18" and larger to ensure tightness of fit of matting components. The solvent cementing method is not recommended for any type of end-to-end joining.
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