Hi Mike;

According to the information I have (I don't know where I got it but I've used it 23 years) Specific gravity of 1.280 = -92F is the freezing point. 1.250 = -60F, 1.220 = -31F, 1.190 = - 6F, 1.100 +18F.

Just used the overhead in class yesterday. Login to read more.