Polyurethane (PUR, PU)

Polyurethane (PUR, PU) is a durable polymer which is used as a coating for sensor cabling and as a sealing compound to keep out water and as a potting compound to protect electronics components from damage.

Polyurethane has the flexibility and strength of rubber and the hardness of plastic making it a useful compound for isolating electronic components within pressure sensors from vibration and shock.

Polyurethane is resistant to swelling and degradation, when exposed to water for long periods of time, making it suitable for use as the outer cable jacket material for submersible pressure sensors. PUR is also mouldable and can be bonded to metal, this makes it ideal for making a permanent waterproof seal between a PUR coated cable and the backend assembly of a submersible pressure sensor.

Polyurethane coatings are resistant to abrasion, heat, cold, mold, mildew, fungus, freshwater, oil, solvents, grease and soap solutions.
PUR is more expensive than PVC which is also used as cable coating, and thus the cost per metre/foot for PUR coated cables tends to be higher than PVC coated cables.