There is indeed a standard for the production of press oil in small workshops. In China, the production, processing and sales of edible oil have corresponding national standards and regulations.

For example, the implementation standard of soybean oil is GB/T 1535-20 17 soybean oil and the implementation standard of pressed rapeseed oil is GB/T 1536-2004 rapeseed oil. These standards stipulate the quality requirements, detection methods and labeling requirements of oils and fats.