PPG PR-142 PRC Standard Spec Adhesion Promoter for Metal Aircraft Sealing Applications
PPG PR-142 is a clear, high-performance adhesion promoter designed specifically for metal aircraft surfaces where PRC Standard Specification sealant systems are required. Its targeted formulation is optimized for maximum adhesion promotion on aluminum alloys and steel substrates, the primary structural metals used in commercial and military aircraft construction and repair.
PR-142 functions as a critical interface layer between the metal substrate and the polysulfide or polythioether sealant, creating a chemically bonded adhesion bridge that resists hydrolytic attack, fuel immersion, and thermal cycling stress. It is an essential component of specification-compliant fuel tank and structural sealing systems on metal aircraft.
Supplied in a 16 oz glass bottle, PR-142 provides sufficient material for treating substantial sealing areas in production and MRO environments. Its clear formulation is compatible with all major PPG aerospace sealant products.
Product Specifications
| Attribute | Detail |
|---|---|
| Manufacturer Part Number (MPN) | 0142XLRCA016PT |
| Brand | PPG Aerospace |
| Product Series | PR-142 |
| Specification | PRC Standard Specification |
| Color | Clear |
| Product Type | Adhesion Promoter |
| Package Size | 16 oz Glass Bottle |
| Substrate Compatibility | Aluminum, Steel, Metal Alloys |
| Application Method | Brush, Wipe |
| Industry Use | Commercial Aviation, Military, MRO |
Technical Information
PR-142 is formulated with coupling agents specifically selected for optimal reactivity with metal oxide surfaces, providing a superior adhesion foundation compared to universal promoters on aluminum and steel substrates. Its chemistry creates stable, covalent bonds at the metal-promoter and promoter-sealant interfaces that resist the hydrolytic degradation mechanisms responsible for most sealant adhesive failures in fuel tank environments.
The promoter is applied in a thin, uniform film and allowed to flash off per PPG’s technical data sheet before sealant application. On aluminum surfaces, PR-142 works in conjunction with chromate conversion coating pretreatment to provide a complete, multi-layer adhesion and corrosion protection system for long-term seal integrity.
PR-142 has been validated against PRC Standard Specification adhesion requirements through immersion testing in aviation fuels, hydraulic fluids, and thermal cycling per the applicable test protocols. Its consistent performance on metal substrates makes it the preferred choice for metal-specific sealing applications.
Why Choose PPG PR-142?
- ✅ PRC Standard Spec Qualified — Specification-compliant metal sealing system
- ✅ Optimized for Metal Substrates — Superior performance on aluminum and steel
- ✅ Fuel and Fluid Resistant Bond — Maintains adhesion in wet zone applications
- ✅ 16 oz Production Size — Efficient for large-area MRO operations
Frequently Asked Questions
Q: What is the MPN for PPG PR-142 16 oz?
A: MPN is 0142XLRCA016PT. Spec: PRC Standard Specification.
Q: What is the difference between PR-142 and PR-148?
A: PR-142 is optimized for metal substrates while PR-148 has broader substrate compatibility. Both meet PRC Standard Spec but are selected based on the specific substrate being sealed.
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