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Aviation // Passivators

S-Weld PassGel-NP
Passivating Gel
  • Gel consistency for ease of application
  • Enhancement of chrome oxide corrosion resistant (passive) layer
  • Dissolves any residual surface contamination
  • Improved quality of fabricated product
  • Conforms to: ASTM A380 and ASTM A967 Passivation Treatments, Collins Aerospace RPS 15.00 - SURFACE PREPARATION OF HEAT AND CORROSION RESISTANCE ALLOYS, Collins Aerospace RPS 15.52 - CLEANING OF ALUMINIUM


Callington S-Weld PassGel-NP is a powerful fluorine-free oxidizing passivator gel for cleaning and passivating stainless steel and aluminium alloys. This multi-purpose, gel-formatted passivator significantly reduces the amount of disassembly required for both passivation and cleaning of corroded stainless steel. It removes foreign materials, prevents corrosion, and efficiently strips anodized coatings from aluminium. S-Weld PassGel-NP can be used following pickling, grinding or mechanical polishing to ensure a passive surface is obtained prior to installation or commissioning of the final product.

Directions for Use

1. Surface should be pre-cleaned to remove oils and greases before applying the passivating agent. Use a suitable alkaline degreaser (contact your Callington Representative for suitable product). Any contamination will shorten the life of the passivating gel.
2. Stir the gel to ensure a smooth consistency and apply S-Weld PassGel-NP using the acid resistant brush provided.
3. Allow 10-20 minutes of dwelling time on stainless steel. Test first with the product to establish minimum dwell time.
4. Rinse thoroughly with clean potable water, dry surfaces to prevent water staining (smut). If a neutralizing agent has been used this must be followed by rinsing again with clean potable water and surfaces should be dried to prevent water staining.

1. Wear PVC gloves, goggles, overalls and safety boots. Wear a respirator if working in a confined or poorly ventilated area.
2. Avoid spillages and do not allow gel to come in contact with the body or eyes. Avoid breathing in the vapours.
3. If skin contact occurs, immediately flush body and/or clothes with water. Remove all contaminated clothing.
4. Replace the lid on the container tightly after use, and store upright in a cool dry area away from direct sunlight. Do not store or use below 5°C.
5. S-Weld PassGel-NP has a recommended shelf life of twelve (12) months if stored as per above conditions (item 4).

NB: S-Weld PassGel-NP is presented as a 1 quart (946mL) security cap plastic container, and each bottle comes with an acid resistant application brush.


Conforms to 
• ASTM A380 and ASTM A967 Passivation Treatments
• Collins Aerospace RPS 15.52 - CLEANING OF ALUMINIUM

Physical Properties

Specific Gravity 1.40
Water Solubility Miscible
pH (as supplied) < 1.0
Appearance & Color Thick white translucent gel

Ordering Info

Part NumberSizesCase Pack
1136/32 32oz 4
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