Building Project Information. On May 2, 2017, the New Bremen Schools Board of Education will be placing a bond levy on the ballot for a new K-8 building. You can find more information about the building project by using any of the Building Project links within the red navigation bar above or by clicking here.
Bitumen is the thickest form of petroleum there is, made up of 83% carbon, 10% hydrogen and lesser amounts of oxygen, nitrogen, sulphur, and other elements. It is a natural polymer of low molecular weight: at lower temperatures it is rigid and brittle, at room temperature it is flexible, at higher temperatures it flows.
But if an o-ring is made from, nitrile, for example (a material used in car fuel and oil lines) then there is no problem using petroleum grease to lubricate the o-ring. The problem is: How do you know if the o-ring is made from synthetic rubber or ordinary natural rubber?