This Malaysian Standard covers specifications and test methods for unused mineral insulating
oils. It applies to oil delivered to the agreed point and time of delivery, intended for use in
transformers, switchgear and similar electrical equipment in which oil is required as an
insulant and for heat transfer. These oils are obtained by distillation and refining of crude
petroleum. Oils with and without additives are both within the scope of this standard.
This standard is applicable only to unused mineral insulating oils. Reclaimed oils are beyond
the scope of this standard. This standard does not apply to mineral oils used as impregnants
in cables or capacitors.
NOTE. Mineral insulating oils complying with the requirements of this standard, of the same class and containing no
additives (see 3.4), are considered to be compatible with one another and can be mixed in any proportion. This does
not apply to oils containing additives. Where the user wishes to mix such oils, a check is recommended to be made to
ensure that the mixture meets the requirements of this standard.