A recent technical enquiry to Evans resulted in the following replies:


Q1. What is the coefficient of thermal expansion over range -20degC to +120degC,

A1. The co-efficient of expansion of water based 50/50 standard automotive antifreeze is approximately 5% by volume, Evans Waterless Engine Coolant is approximately 6% by volume.

Q2. Is this expansion consistent across that temperature range?;

A2. Yes, this expansion rate is consistent across these temperature ranges and again similar to that of 50/50. The 6% by volume figure is based on the high end of the temperatures that you have stated above.