For plastic injection mold, you may have many questions to quote. Here I list a few questions you may want to ask.
Are there CAD drawings and or samples of the part to be quoted?
To begin to form an accurate quote, the molder needs to know what you are asking them to make. Detailed dimensional drawings provide information on the size and complexity of the part. A sample or prototype can help the molder begin to determine how to maximize the design for manufacture ability.
What is the part intended to do? Are there chemical or environmental issues the part will be exposed to?
The injection molder you are working with needs to understand the end-use application of the part. This explanation will help the manufacturer determine how sturdy the part needs to be and what the wear and tear will be over time. The information you provide will help your molder make recommendations on the resins and/or additives needed for your project.
What quantities of plastic injection mold are needed?
All plastic injection molds are not made alike. If you are interested in smaller quantities or a shorter production run, an aluminum mold might be the best option. If your project requires large quantities over a longer time span, then a hardened stainless steel mold would be the best choice. The upfront cost of the latter option is much greater; however it pays for itself over the life of the tool. High volume, precision molders like The SPARK specialize in building tools only made with hardened stainless steel.
What is the size and complexity of the part?
While many plastic injection molds are made through injection molding, there are other molding processes that can be used to produce a part. You can read about them in a related article. Briefly, smaller parts that are more complex are ideally suited to the injection molding process. Larger parts may be produced with injection molding or compression molding. Very large parts lend themselves to rotational molding while hollow objects, like bottles, are made with blow molding.