Vulcanisation on site – recommandations

Vulcanized O-Rings and On-Site Bond Quality

Standard procedures usually specify mold temperatures and cure times, but often omit a few critical details. Over the years, many issues have been traced back to the following points.

1. Always start from a fresh cut

A recent cut exposes a clean, active surface, which is essential to obtain a strong chemical bond during vulcanization. A slightly oxidized or contaminated end will significantly reduce adhesion. Let us cut your cord right before vulcanizing, or avoid cutting your lengths too far in advance on site.

2. Use fresh adhesive and keep full traceability

Always check the manufacturing date and the date written on the adhesive container, and make sure you have a valid certificate of conformity with every shipment. Expired adhesive loses its bonding properties and compromises the reliability of the joint. FKM (Viton) adhesive, for example, only remains usable for a few weeks even when properly refrigerated. Batch traceability is a key element of quality control.

3. Control mold temperature precisely

A reliable thermometer is essential, and a direct-contact probe is preferable. Be careful with laser infrared guns: temperature readings on aluminum are often artificially low because of the metal’s reflectivity. If the device is not properly configured for aluminum, you could overheat the mold and damage your equipment.

4. Use the right tools for clean cuts

A portable guillotine cutter or a miter shear helps produce straight, clean ends, ensuring a tight, precise fit before vulcanization. Be cautious with utility knives: a crooked or crushed cut will affect the contact area and reduce performance, especially in terms of pressure resistance.

Details drive reliability

Paying attention to these details improves not only the mechanical strength of the joint, but also the overall reliability of the process. Consistent quality always starts with discipline and an experienced partner.