--- title: [Cleaning | Practical Guide #2] What Methods Are Available for Evaluating Degreasing and Cleaning of Metal Processed Parts? description: Various cleaning agents are used in metal degreasing processes. In recent years, hydrocarbon cleaning agents have become increasingly common as alternatives to chlorinated organic solvents. Hydrocarbon solvents are broadly divided into normal paraffin (n-paraffin) and iso-paraffin. This article introduces their characteristics based on differences in molecular structure. image: https://cleaning.jfe-shoji-ele.co.jp/hubfs/assets/images/ogp.jpg --- [![company-logo-en](https://cleaning.jfe-shoji-ele.co.jp/hs-fs/hubfs/company-logo-en.png?width=600&height=80&name=company-logo-en.png "company-logo-en")](https://cleaning.jfe-shoji-ele.co.jp/en) Industrial Cleaning Guide - [About us](https://th.jfe-shoji-ele.co.jp) - All articles - [Cleaning Equipments](https://www.jfe-shoji-ele.co.jp/en/solution/hydro-carbon-cleaning-machine/) - [Hydrocarbon solvent](https://th.jfe-shoji-ele.co.jp/cl_j-clean-d) - [Recycling Solvent](https://th.jfe-shoji-ele.co.jp/utj_re_solvent_en) - [Brochure](https://cleaning.jfe-shoji-ele.co.jp/br_dl_cl_blog) - [Contact us](https://cleaning.jfe-shoji-ele.co.jp/iq_en) [JFE Shoji Electronics Corporation](https://www.jfe-shoji-ele.co.jp/) [Industrial Cleaning Guide: Basics & FAQ](https://jfe-shoji-ele.co.jp/en) [The Industrial Cleaning Handbook｜ Your Complete Guide to Industrial Cleaning Solutions](https://cleaning.jfe-shoji-ele.co.jp/cl-en) \[Cleaning | Practical Guide #2\] What Methods Are Available for Evaluating Degreasing and Cleaning of Metal Processed Parts? # \[Cleaning | Practical Guide #2\] What Methods Are Available for Evaluating Degreasing and Cleaning of Metal Processed Parts? March 5, 2025 ## Overview Metal processed parts use machining oils and release agents during the manufacturing process. These oils must be removed through cleaning processes as they can cause defects in subsequent processes such as coating and plating. This article introduces various methods and principles for evaluating cleaning effectiveness. ![metal parts](https://cleaning.jfe-shoji-ele.co.jp/hs-fs/hubfs/metal%20parts.png?width=957&height=567&name=metal%20parts.png) | -   - Purpose of Cleaning Metal Processed Parts - Introduction to Oil Residue Testing Methods | | --- |   ## Purpose of Cleaning Metal Processed Parts ### Oil Adhesion During Metal Processing Metals come into contact with various oils during processing. These include machine lubricants, processing oils, and rust preventive oils that adhere to metal parts for various reasons and purposes. ### Main Purpose is Degreasing These oil residues can repel coating agents or plating in subsequent processes, leading to defects. Therefore, oil removal is essential in metal processing. This oil removal process is called "degreasing." ### Introduction to Degreasing Methods (Physical and Chemical) There are two main degreasing methods: #### **１．Physical Degreasing Methods** 　・Wiping with cloth 　・Dry heating in high-temperature furnaces for several hours to oxidize and burn off oil   #### **２．Chemical Degreasing Methods** - - Previously used chlorinated and fluorocarbon solvents (now restricted due to health and environmental concerns) - Currently using environmentally friendly cleaners like hydrocarbon cleaning fluids and alkaline cleaning solutions ## Oil Residue Testing Methods ### Why Perform Oil Residue Testing Manufacturing facilities need to verify cleaning effectiveness to manage product quality. Insufficient verification can lead to: - Undetected product oil residue - Defects in subsequent processes - Time-consuming process improvements ## Six Testing Methods Used in Manufacturing   ### １．Simple Wettability Test (India Ink) Apply or immerse sample in India ink Well-degreased surfaces show uniform ink coverage Poor cleaning shows ink repulsion in areas with remaining oil   ### 2.Reagent Wettability Test (Dyne Pens) More quantitative than India ink Uses pens with different surface tension values Determines surface energy through ink behavior   ### 3.Visual Inspection with Light Uses black light inspection Fluorescent substances in processing oils become visible Simple visual confirmation method   ### 4.Adhesion Tape Test Apply cellophane tape to cleaned surface Apply pressure and perform peel test Poor cleaning shows tape peeling   ### 5.Contact Angle Measurement Quantitative wettability measurement Measures angle between water droplet and surface Smaller angles indicate better cleaning Can calculate surface energy using Young's equation   ### 6.Residue Analysis (Infrared Spectroscopy) Quantitative measurement of surface oil Uses Lambert-Beer law Measures absorbance of extracted oil Compares results with calibration curve This translation maintains the technical accuracy while making the content accessible to English readers. The structure and key points of the original article are preserved while ensuring natural English expression. ### お気軽にお問い合わせください - [資料ダウンロード](https://www.jfe-shoji-ele.co.jp/sent/document/) - [お問い合わせ](https://lp.jfe-shoji-ele.co.jp/ds/semicon-iq) ### シェア - - ## 関連記事 - [![](https://cleaning.jfe-shoji-ele.co.jp/hs-fs/hubfs/metal%20parts.png?width=352&name=metal%20parts.png)](https://cleaning.jfe-shoji-ele.co.jp/cl-en/vapor-cleaning) #### [The Mechanism and Advantages/Disadvantages of Vapor Cleaning/Drying](https://cleaning.jfe-shoji-ele.co.jp/cl-en/vapor-cleaning) March 6, 2025 - [![](https://cleaning.jfe-shoji-ele.co.jp/hs-fs/hubfs/hc-chemical.png?width=352&name=hc-chemical.png)](https://cleaning.jfe-shoji-ele.co.jp/cl-en/hydrocarbon-solvents) #### [\[Cleaning | Practical Guide #1\] The Difference Between Normal Paraffin and Iso-paraffin in Hydrocarbon Solvents](https://cleaning.jfe-shoji-ele.co.jp/cl-en/hydrocarbon-solvents) March 5, 2025 ### [前の記事 ![](https://cleaning.jfe-shoji-ele.co.jp/hubfs/hc-chemical.png) \[Cleaning | Practical Guide #1\] The Difference Between Normal Paraffin and Iso-paraffin in Hydrocarbon Solvents](https://cleaning.jfe-shoji-ele.co.jp/cl-en/hydrocarbon-solvents) ### [次の記事 ![](https://cleaning.jfe-shoji-ele.co.jp/hubfs/metal%20parts.png) The Mechanism and Advantages/Disadvantages of Vapor Cleaning/Drying](https://cleaning.jfe-shoji-ele.co.jp/cl-en/vapor-cleaning) [記事一覧へ戻る](https://cleaning.jfe-shoji-ele.co.jp/cl-en) ### Need help or have feedback? 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