Some Common FAQs
What is polyurethane?
Polyurethane is a flexible plastic called an elastomer. A scientifically accurate answer is that it is a polymer (a material made up of many repeating chemical units) which has urethane as a repeating unit.
What is urethane?
Urethane is a collection of five specific atoms arranged in a very specific way. The atoms are nitrogen, carbon, two oxygens and one hydrogen. This arrangement is created when an isocyanate (a chemical group of atoms with a nitrogen, carbon and oxygen atom) reacts with a hydroxyl (oxygen and hydrogen) group.
Since chemical fumes can be...
Since chemical fumes can be potentially dangerous, safety is a must while the polymer-resin blend and disocynate are mixed and poured into the molds.
Here is enough link pin outer...
Here is enough link pin outer bushings for several thousand VWs.
These urethane bushings can...
These urethane bushings can be made easily and quickly by the hundreds to meet any size order.
What is the difference between polyurethane and urethane?
Usually they refer to the same thing. Very technically, urethane is a specifically arranged group of atoms and polyurethane is a material which contains lots of urethane groups.
What does "durometer hardness" mean?
There is an instrument called a durometer which has a spring-loaded feeler gauge that pushes into the surface of a flexible material like a urethane bushing. It measures the amount of penetration for a given force; this is called the durometer hardness of the material. The A scale durometer (as well as B, C and D) goes from zero to 100. A measurement of 100 means that the feeler did not penetrate the material at all, whereas a measurement of zero means that the material offered no resistance at all. As an example, car tires and running shoe soles tend to be about 75A, inline skating wheels are about 78A to 82A. Though the hardness of BUGPACK's products vary from application to application, some of their softer products range from 52 to 90 A but some are as hard as 60 to 80 D.
Is urethane toxic?
Some of the liquid raw materials that go into making urethane are indeed toxic, and must be handled with caution. However, once the urethane reaction is completed, the solid material is safe to use as intended. Of course, never burn urethane as the fumes are toxic, and the dust created when urethane is sanded can be toxic as well.
Here is the mixing point for...
Here is the mixing point for the polymer (upright tank on the left) and the disocynate (on the right). The hardness and specific chemical properties of each part are a closely guarded secret at BUGPACK.