2.3.3 Coating Removal, Peeling Method

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Outline

This peeling removal method for coatings can be used only under special circumstances. It is commonly used to remove RTV silicone or other thick, rubbery-like coating materials. The coating material is removed using a dull knife or other dull blade to slit it and peel it off the printed board or printed board assembly. The coating must first be identified to determine the appropriate coating removal procedure. Refer to procedure number 2.3.1.

Note: This method is limited to rubbery coatings, as it allows the coating material to be slit into small sections and peeled off the printed board assembly.

Minimum Skill Level - Advanced

Recommended for technicians with soldering and component rework skills and exposure to most repair/rework procedures, but lacking extensive experience.

Conformance Level - High

This procedure most closely duplicates the physical characteristics of the original, and most probably complies with all the functional, environmental and serviceability factors.

Procedure References
1-0	1.0 Foreword
2-1	2.1 Handling Electronic Assemblies
2-2	2.2 Cleaning Procedures
2-3-1	2.3.1 Coating Removal, Identification of Coating
2-4-1	2.4.1 Coating Replacement, Solder Mask
2-4-2	2.4.2 Coating Replacement, Conformal Coating, Encapsulant

Tools and Materials

Knife with #16 Blades
A must-have tool for precise cutting, scraping and trimming.

Mixing Picks
Disposable mixing sticks for mixing and applying adhesives.

Precision Tool Set
Nine precision-crafted tools for detailed circuit board work.

Scraper, Curved Tip
Hardened stainless steel tip for scraping solder mask and removing defects.

Thermal Parting Tool
Thermal removal tool using controlled heat through specially shaped tips.

Procedure

Slit and peel off the coating material with a dull knife or a heated dull blade. (See Figure 2)
Repeat as needed until the required material is removed.

Evaluation

Visual examination or UV light may be used to verify complete coating removal.

Images

Coating Removal, Peeling Method

The area requiring coating removal is identified.

Slit and peel off the coating material with a dull knife or heated dull blade.

Repeat as needed until the required material is removed.