EPDMkalvoja

EPDMkalvoja are thin, flexible sheets made from EPDM, a synthetic elastomer known as ethylene propylene diene monomer. In Finnish usage, the term refers to EPDM film or sheets produced for waterproofing, insulation, and protective coverings. EPDMkalvoja can be produced in various thicknesses and widths and may be unreinforced or reinforced with fabrics or fillers.

Composition and production: EPDM is formed from ethylene, propylene, and a diene monomer (commonly ethylidene norbornene or dicyclopentadiene) to create a durable rubber. Film is produced by extrusion or calendering, then vulcanized (crosslinked) by peroxide or sulfur systems to impart elasticity and heat resistance. Reinforcement increases tear strength; color is typically black due to carbon black.

Properties: EPDM films exhibit excellent resistance to weathering, ozone, UV radiation, and aging, as well as low permeability to water and water vapor. They operate across a broad temperature range and have good electrical insulation properties. They also show chemical resistance to many acids and bases but relatively poor resistance to hydrocarbon oils. Flexibility remains high at low temperatures.

Applications: EPDMkalvoja are widely used in roofing membranes and waterproofing layers, pond and reservoir liners, vapor barriers, greenhouse and agricultural films, and protective coverings. They may also serve as insulation or vapor barriers in building assemblies and as underlayment for roofs and foundations, depending on thickness and reinforcement.

Handling and sustainability: Joining EPDMkalvoja typically requires compatible adhesives or heat/chemical welding. Proper surface preparation, ventilation, and following supplier recommendations are important. EPDM is not readily recyclable in conventional streams; reclaimed films can be ground for crumb rubber or devulcanized for specialized uses, with recycling options varying by region. Disposal follows local regulations.