V
5 Posts in this encyclopedia categoryVerfallsdatum
The use-by date states the point up to which a medical device may be used without restriction when stored correctly. It is marked with the hourglass symbol under EN ISO 15223-1. For sterile products, the sterility guarantee also ends on this date.
Vinyl
Vinyl gloves are made from polyvinyl chloride (PVC) and contain plasticisers (typically phthalates such as DEHP) to achieve flexibility. They are latex-free and cheaper than nitrile but mechanically weaker. Plasticiser concerns are making vinyl increasingly unattractive in the EU for sensitive applications.
Vulcanisation
Vulcanisation is the process by which rubber (latex, nitrile) is converted into an elastic, tear-resistant material through polymer chain cross-linking under heat, pressure, and vulcanising agents. The accelerators used (thiurams, carbamates, benzothiazoles) can trigger Type IV contact allergies.
Vulcanisation Accelerator
Vulcanisation accelerators are chemical auxiliaries in latex and nitrile glove manufacture that speed up sulphur cross-linking. Main groups: thiurams, dithiocarbamates, benzothiazoles. They are the primary trigger of Type IV contact allergies. Accelerator-free gloves are available as an alternative. Without accelerators, economically viable, high-quality vulcanisation is not possible.