Christopher Morgan 
Short answer: use HDPE for containers that hold cold or room-temperature product, take a beating, and must resist chemicals; use PP when the container sees heat, repeated flexing, or needs to look clear on a shelf. That is really the hdpe vs pp which plastic to use for containers decision for most designs. Both are … Read more
Short version: PET is the default sheet for clear, rigid, dimensionally stable trays, blisters, and retail displays, and PETG is the better pick when the part is a deep draw, gets dropped, flexed, or handled hard. Both are polyester thermoplastics and both form on ordinary vacuum or pressure equipment, so the decision comes down to … Read more
Sink marks in injection molded parts are shallow surface depressions caused by a volumetric shrinkage mismatch: the outer skin of a plastic part solidifies and shrinks while the thicker material behind it is still cooling and contracting, and the frozen surface collapses inward to absorb the difference. They show up on the face opposite a … Read more
Injection molding cycle time is the total elapsed time for one complete shot: mold open, fill, hold, cooling, screw recovery, and ejection. You cut it by attacking whichever phase is actually limiting, and that phase is usually cooling, which typically takes 60 to 80 percent of the cycle. Below is how to reduce injection molding … Read more
Updated for . This guide is written for engineers, product designers and purchasing teams who need a defensible enclosure material decision, not a parts catalog. The short version: choose ABS for indoor, cost-sensitive housings that need to be drilled, tapped, painted and held in tight dimensions. Choose polycarbonate when the enclosure takes drops, sits in … Read more