Originally Posted by jasperpipestone
Really? They are doing a pretty simple overmold. Plastic loves being round. Grades of materials would have to be matched up to get similar melt characteristics, but seems pretty easy to me.
Discspeed is correct. There are a vast amount of different polymers in the plastic industry. When it comes to overmolding you can have two types of bonding (or both) which are a mechanical bond or chemical bond. A mechanical bond is when there is an actual physical member that supports and 'locks' onto within the overmold. Even if the melt flow of the overmold material melts into the core material, they will not chemically bond to each other (Oil/water do not mix for a ballpark reference). Mechanical bonds do not offer the highest load bearing capabilities and are not most common in the practice. The other instance being a chemical bond, is when the two polymers bond to each other down to the molecular level. In some cases the chemical bond is actually stronger than either of the two materials being used. Mixing and matching different polymer families generally do not produce a chemical bond. We ensure the durability and long life of our products with a chemical bond as our discs are of the highest in durability.