Blown Rapeseed oil (BRO). It’s been around for years, but no-one really understands the structure and until we sent samples for testing, not many people knew their physical properties. Please download our product range listing typical properties. BRO’s are produced by passing hot air through rapeseed oil and the trick is to know when to stop. It’s quite remarkable how these products have been overlooked, usually in preference for TMP trioleates. BRO’s are available in a wide range of viscosities, have excellent VI, high flash points and reasonable pour points. We recommend BRO90 for use in neat cutting oils, forming oils etc and BRO26 for chain saw lubricants.