B-7-Plastic Properties

Here discuss 4 plastic characteristics which being mostly considered in product/process development, and how they affects through out the entire product life cycle. Note: Polymer manufacturer shall provide these information. 4 Temperature Each kind of plastic behaves differently when at 4 different temperature This information help designer to decide injection molding equipment/tool/plastic raw material. This… Continue reading

B-6-Common Plastic Issues

As any manufacturing process, defects can happen and negatively affect your product quality and productivity. To help you avoid this problem and create consistently great products, here discusses 35 different kinds of common plastic part issues (see table-1), their background and possible countermeasure. Before start identifying the issues, it is suggested to complete following actions… Continue reading

B-5-Different polymers and their characteristics

Resin and polymer are organic materials. The key difference between resin and polymer is that resins have small molecular weights, whereas polymers have large molecular weights. Polymers can be divided into 2 major categories: This site we discuss thermoplastic are commonly used in injection molding process. Each plastic model from different supplier can have different… Continue reading


Rib is a kind of mechanical profile which is very common to be seen in plastic part design. Most of the time, the purpose of rib is to increase the strength of plastic part. See illustration of rib in Pic.-1 and 2. While rib is only necessary under the scenario when the area need more… Continue reading

B-3-Wall Thickness

Wall thickness could be measured by parts cross section. Depending on part design, a single part could have many different wall thicknesses. For injection molding part, there are some suggestion regarding wall thickness for a better surface finish and easier production. Too much wall thickness Plastic expends when temperature goes up and shrinks when temperature… Continue reading


Plastic parts will never be the 100% same as the CAD design, since part geometry, material characteristics (raw material expands and contracts according to thermal difference), mold construction (CNC machining), processing variability…etc. Therefore, to indicate the area of the part that shall follow the CAD design and the allowed difference is very important. The allowed… Continue reading

B-1-Design Preparation

There are many ways to produce products, why choose “plastic injection molding” ?? I see 3 reasons below after comparing several manufacturing processes: Here are some principles (not limited) I will consider during design stage if we decide to produce a part with plastic injection molding process, many factors affect plastic-part design. Among these factors… Continue reading