The invention relates to a coating for insulation material, which coating comprises a metal layer, such as an aluminum layer, and a plastic layer. The plastic layer contains plastic that crystallises when heated. The plastic can more particularly be a polyamide.
This is a division of prior application Ser. No. 10/081,133, filed Feb. 22, 2002, which is a continuation of prior application Ser. No. PCT/FI00/00716 filed on Aug. 24, 2000, which claims the benefit of Finland Ser. No. 19991831, filed on Aug. 30, 1999, which are hereby incorporated by reference in their entirety.
