Oils and fats (Treatment of by chemical processes of…) Problem statement: Where is "treatment of oils and fats by chemical processes" classified? Solution: Conclusion of the NACE/CPA Task Force 13-15 November 2006. Following the exclusion in NACE Rev. 2 class 10.41 "treatment of oils and fats by chemical processes" is classified to NACE Rev. 2 class 20.59. Decision date: 15.11.2006