Abstract: A multi-layered pipe comprising a wall having a polyolefin inner layer and a barrier layer being an outer layer relative to the polyolefin inner layer, the barrier layer being formed of a non-metallic barrier material, which barrier material has relative to polyolefin an enhanced resistance to permeation therethrough of hydrocarbon molecules, the pipe further comprising a protective layer being an outer layer relative to the barrier layer, the pipe further comprising a peelable layer between the polyolefin inner layer and the barrier layer, the peelable layer being formable around the polyolefin inner layer by means of extrusion. The protective layer and the barrier layer may together be incorporated in a single layer.

Abstract: A multi-layered pipe comprising a wall having a polyolefin inner layer and a barrier layer being an outer layer relative to the polyolefin inner layer, the barrier layer being formed of a non-metallic barrier material, which barrier material has relative to polyolefin an enhanced resistance to permeation therethrough of hydrocarbon molecules, the pipe further comprising a protective layer being an outer layer relative to the barrier layer, the pipe further comprising a peelable layer between the polyolefin inner layer and the barrier layer, the peelable layer being formable around the polyolefin inner layer by means of extrusion. The protective layer and the barrier layer may together be incorporated in a single layer.

Abstract: A multi-layered pipe having a wall with a protective outer layer which comprises PET, wherein preferably the protective outer layer is the most outer layer of the pipe, wherein preferably at least one of the layers is pigmented, and wherein preferably at least one of the layers is transparent, wherein the pipe further has a barrier layer which has relative to polyolefin an enhanced resistance to permeation therethrough of at least one of: hydrocarbon molecules, oxygen molecules, hydrogen molecules.

Abstract: A multi-layered pipe comprising a wall having a polyolefin inner layer and a barrier layer being an outer layer relative to the polyolefin inner layer, the barrier layer being formed of a non-metallic barrier material, which barrier material has relative to polyolefin an enhanced resistance to permeation therethrough of hydrocarbon molecules, the pipe further comprising a protective layer being an outer layer relative to the barrier layer, the pipe further comprising a peelable layer between the polyolefin inner layer and the barrier layer, the peelable layer being formable around the polyolefin inner layer by means of extrusion. The protective layer and the barrier layer may together be incorporated in a single layer.

Abstract: The invention relates to a novel process for making compositions comprising a polyamid, water and a salt, having reduced crystallinity, wherein the process comprising the steps of: a. mixing the polyamide, water and a salt b. heating the mixture to a temperature above 100° C. in a range between 120° C. below the Brill temperature and 50° C. above the Brill temperature of the polyamide at a pressure above the vapour pressure of the mixture at said temperature c. optionally cooling down the mixture.