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btw, “P-tex” is not “UHMW”, it is a name that refers to a bunch of polyethylene plastics used in base material.
“Extruded” generally refers to HDPE (high density polyethylene) that is made in an extrusion process that involves heating polyethylene pellets and forcing them through a die which squirts (bad adjective) out finished plastic in a desired shape.
“Sintered”, on the other hand, generally refers to UHMWPE (ultra high molecular weight polyethylene) that is made through a different type of extrusion process. This process involves feeding powdered polyethylene into a machine that heats and compresses the powder before forcing the plastic through a die which also squirts out finished plastic in desired shape X.
Sintered UHMWPE bases are higher quality, higher density, and have a higher ratio of amorphous particles to crystalline particles in their composition than extruded HDPE bases. This translates into why they wax better and are more suited to die cut graphic applications. Also, because sintered UHMWPE is manufactured from a powder form, other materials, like graphite and carbon, can be added to it to improve the speed of bases. Both sintered and extruded varieties come in large ranges of hardness and quality, so durability comparisons are pretty complicated.
As to the word “P-tex” itself, from what I gather, P-tex used to be a trademark owned by a Swiss thermoplastics company that is no longer. It seems that P-tex® now belongs to “Creative Plastic Solutions”, a German company that makes both HDPE and UHMWPE base material. In north america though, the word “P-tex” is just a loose blanket term.
Fun fact - UHMWPE is safe to eat…….or at least non toxic….