Oil Grades-
100% Pure:
Must meet USP criteria for consumption and pharmaceutical applications and is unadulterated (100% pure) with no other oils blended in.
Food Grade:
Must meet USP criteria for consumption and pharmaceutical applications, but can be a blend of more than one type of oil.
Cosmetic Grade:
Must meet USP criteria for consumption and pharmaceutical applications and is almost always a blend of more than one oil, but will have the same properties and SAP value of the oil it is being identified as.
Technical Grade:
Does not meet USP requirements for consumption or pharmaceutical applications.
Refined Oils
Naturally refined oils are more thoroughly filtered and strained than unrefined, usually with some additional heat, but without harsh or damaging chemicals. Refining reduces the nutrient level and flavor. It also removes particles and resins and makes naturally refined oils more stable for longer storage, more resistant to smoking, and a good choice for high-heat.
Unrefined Oils
Unrefined oils are filtered only lightly to remove large particles. Some, such as sesame or olive oil, may appear cloudy or have visible sediment after sitting. This does not compromise quality. Unrefined oils are “whole” oils and their flavor, color and fragrance are more pronounced than in refined oils. Like unrefined whole grain flours, unrefined oils are more nutritious and have a shorter storage life than refined. Unrefined oils are best used unheated or in low heat. Their natural resins and other beneficial particles burn easily and develop unpleasant flavors and unhealthful properties if overheated.
