TABLE OF CONTENTS Solvay: Solef
Items produced from all nonreinforced grades of Solef PVDF can be easily assembled using standard welding methods such as hot air welding with welding rod; polyfusion (butt or socket welding); heat-sealing; ultrasonic; vibration; friction; dielectric heating (high frequency) or solvent bonding.
Reference: Solvay Polyvinylidene Fluoride, Supplier design guide (B-1292c-B-2.5-0390), Solvay, 1992.
Solvay Solexis: Solef, Hylar
The mating parts are heated by pressing onto a metal heater which is held at 250 270 C (482 518 F) and which has been surface treated (usually with PTFE) to minimize adhesion. The ideal pressure on the hot surface is 0.5 0.6 bar (7.3 8.7 psi; 0.05 0.06 MPa), and the time should be sufficient for the fusion of the material to a depth of 4 5 mm (0.16 0.20 inches) at the contact surface. The heating unit is then removed and contact is made under a pressure of ideally 0.6 0.8 bar (8.7 11.6 psi; 0.06 0.08 MPa). Welding factors obtained by this technique are generally between 0.9 and 1.
Reference: Solef & Hylar PVDF Design and Processing Guide, Supplier design guide (BR2001C-B-2-1106), Solvay Solexis, 2006.
PVDF [form: 110 mm (4.3 inch) diameter pipe, 5.3 mm (0.2 inch) wall thickness]
An investigation into the technology and strength of butt pressure-welded tubular joints showed that all three welding parameters (temperature of heating element, contact pressures during preheat and cooling, and heating time) had a significant effect on the properties of the joints.
The quality of the joint was assessed on the basis...
