PPG® Korotherm® 821X404 Whitish Gray Boeing MMS-458E Spec Fire & Thermal Protective Coating – Gallon Kit
PPG Korotherm 821X404 by PPG Aerospace is a professional-grade fire & thermal protective coating available in Gallon Kit format. Designed for application on Aircraft Structures, Titanium, Steel, Fire Zone Areas, it delivers reliable protection, long-term adhesion, and specification-grade coating performance across demanding aerospace, military, and industrial applications. Whitish gray in color, this product is trusted by aerospace engineers, MRO professionals, and coating specialists worldwide who require consistent, specification-compliant coating performance in every application.
| Attribute | Detail |
|---|---|
| Manufacturer Part Number (MPN) | 0821X404X0XMG22K |
| Brand | PPG Aerospace |
| Product / Model Name | PPG Korotherm 821X404 |
| Color | Whitish Gray |
| Package Size | Gallon Kit |
| Product Type | Fire & Thermal Protective Coating |
| Specification | Boeing MMS-458E |
| Compatible Substrates | Aircraft Structures, Titanium, Steel, Fire Zone Areas |
Technical Information
PPG Korotherm 821X404 in the gallon kit format provides Boeing MMS-458E compliant fire and thermal protective coating for large-scale structural thermal coating operations on Boeing commercial aircraft. MMS-458E is the enhanced or revised version of the Boeing MMS-458 thermal coating standard, specifying updated performance requirements for fire and thermal protection coatings applied to aircraft structural members in fire-critical zones. The gallon kit provides sufficient material for complete thermal coating of structural panels, frames, and fire zone surfaces in production or heavy maintenance environments requiring MMS-458E specification compliance.
Why Choose PPG Korotherm 821X404?
- Boeing MMS-458E Compliant — Updated Boeing specification for fire & thermal structural coating
- Gallon Production Format — Large kit for complete structural thermal coating operations
- Fire Zone Protection — Provides critical fire and heat protection for aircraft structural members
- Whitish Gray ID Color — Standard color for thermal protective coating visual identification
- PPG Korotherm Trusted — Leading PPG Aerospace thermal protection coating series
Frequently Asked Questions
Q: What is PPG Korotherm 821X404 Gallon Kit used for?
A: PPG Korotherm 821X404 Gallon Kit is used for large-scale fire and thermal protection coating of aircraft structural panels, frames, and fire zone components on Boeing commercial aircraft requiring Boeing MMS-458E specification compliance.
Q: What is the MPN for PPG Korotherm 821X404 Gallon Kit (MMS-458E)?
A: The Manufacturer Part Number (MPN) is 0821X404X0XMG22K.
Q: What is the difference between MMS-458 and MMS-458E?
A: MMS-458E is a revised or enhanced version of the Boeing MMS-458 thermal protective coating standard. The ‘E’ suffix typically denotes a specification revision with updated performance or application requirements. Consult the applicable Boeing aircraft maintenance manual for the correct specification revision required for your aircraft.
Q: How much area does a gallon of PPG Korotherm 821X404 cover?
A: Coverage depends on the specified wet and dry film thickness for your application. Consult the PPG Korotherm 821X404 Technical Data Sheet for coverage rate at the required film build for MMS-458E compliance.
Q: Is MMS-458E the same product as MMS-458?
A: PPG Korotherm 821X404 may meet both MMS-458 and MMS-458E depending on the revision. Verify the specific specification revision qualification with PPG Aerospace and your applicable Boeing maintenance documentation before ordering.
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