Typical mineral transformer oil density is commonly in the range of about 860 to 900 kg per cubic meter at reference temperature, but the exact value depends on formulation and temperature. Density decreases as temperature increases, so logistics and tank calculations often use a specified reference condition and correction factors. Ester and silicone fluids can have different densities than mineral oil. For accurate engineering and procurement, the correct density is taken from the product datasheet and the measured oil temperature during handling.
.
