1-PETE Polyethylene Terephthalate
2-HDPE High Density Polyethylene
3-V Vinyl/Polyvinyl Chloride
4-LDPE Low Density Polyethylene
5-PP Polypropylene
6-PS Polystyrene
7-Other
Technical Article: The Necessity of Obtaining Closure Samples and Information Prior to a Plastic Bottle Production Run
Child Resistant Closure Specifications
Material Codes/Recycling Symbols
Freight Classifications
Properties of Resins
SPI Neck Finish Specifications
Technical Article: The Blow Molding Process Closures & Containers Magazine
Technical Article: The Market Share Closures & Containers Magazine
Third Party Packaging Certification Agencies
Torque Guidelines for Closures
1-PETE Polyethylene Terephthalate
2-HDPE High Density Polyethylene
3-V Vinyl/Polyvinyl Chloride
4-LDPE Low Density Polyethylene
5-PP Polypropylene
6-PS Polystyrene
7-Other 
