The ASL-seal is a single-acting, spring activated PTFE seal for both pistons and rods. ASL-seals are appropriate for use as a dynamic seal for slowly rotating or reciprocating movements, as well as a shaft, e.g. an O-ring in seal or a static seal. Lipseals often replaces rubber seal applications used within high or low temperatures, or non-lubricated services. ASL-seals can be delivered with many different spring types and materials, adjusted to demands on friction, aggressive media, high wear resistance etc.