Technical documentation: KUNDERT Standard
Plastics are subject to different physical laws than metals. Above all, the greater thermal expansion, the change in volume due to the absorption of moisture and dimensional changes due to the slow reduction of stresses in the material preclude compliance with the tightest dimensional tolerances - as are common for metals. Since there is still no set of standards with tolerances for machined plastic parts as well as polyurethane molded parts and coatings, KUNDERT has developed the standards published here.
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