From The Blog
Resin Identification Codes
What Are the Resin Identification Codes from SPI?
Resin Identification Codes were introduced in 1988 by SPI. SPI is now known as The Plastics Industry Trade Association (formerly Society of the Plastics Industry). The codes are intended to facilitate the sorting of similar looking plastics at recycling centers across the country. While there is no federal legislation or requirements to use these symbols, many states now mandate them. The Resin Identification Codes are a seven number system.…
How to Make an Injection Mold
What is an Injection Mold?
An injection mold is a tool that when all the parts are assembled, fits into an injection molding machine to manufacture identical plastic parts. Injection molds start with a drawing by an engineer of the part required for an application. Next an engineer with knowledge of the injection mold making process makes a mold drawing.
How an Injection Mold is Made
Making an injection mold takes a great deal of skill and some very expensive machinery.…
What Kind of Plastic is This?
What Plastic is this Part Made Of?
There are several ways to determine what plastic the object you have is made of:
*Plastic Resin Identification Codes
*Burn Test
*Floats or sinks in water
Plastic Resin Identification Codes
The plastics identification codes were developed in 1988 by SPI Society of Plastic Industries. These codes are intended to be recycling codes. #1 is polyethylene terephthalate (PETE, PET), #2 high density polyethylene (HDPE). #3 polyvinyl chloride (PVC),…