PPG DeSoto CA7870 Black BMS 10-21 Anti-Static Carbon-Filled Epoxy Coating – Quart Kit

PPG Aerospace DeSoto CA7870 is a specialized black, carbon-filled epoxy coating qualified to Boeing Material Specification BMS 10-21 Type IV — a specification covering anti-static and electrically conductive coatings used on aircraft fuel system interiors and other aerospace surfaces requiring controlled electrical conductivity to dissipate static charge buildup safely. CA7870 is one of the most critical aerospace coating products in aviation — fuel tank interior coatings must prevent electrostatic discharge events that could initiate fuel ignition, making anti-static qualification non-negotiable for fuel-wetted surface applications.

The carbon black filler in CA7870 provides the electrical conductivity pathway that dissipates static charges generated by fuel flow through the tank interior to the aircraft structure ground. The BMS 10-21 Type IV qualification confirms that CA7870 meets Boeing’s rigorous electrical resistivity, adhesion, fuel resistance, and chemical compatibility requirements for fuel tank interior use on Boeing commercial aircraft.

The quart kit provides a practical quantity for fuel tank inspection opening maintenance, patch repairs, and touch-up operations where the full 4-gallon production kit is not required. Apply per the applicable Boeing Structural Repair Manual procedure and PPG DeSoto CA7870 product data sheet.

Technical Information

DeSoto CA7870 is formulated with carbon black conductive filler at a loading level that provides electrical surface resistivity within the range specified by BMS 10-21 Type IV — conductive enough to dissipate static charge safely but not so conductive as to present a short-circuit risk in the electrical environment of the aircraft fuel system. The epoxy binder provides excellent adhesion to aluminum fuel tank structure and strong resistance to jet fuels, aviation gasoline, hydraulic fluids, and the water-fuel mixtures encountered in fuel tank bottom water bottoms.

The electrical conductivity of the cured CA7870 coating is measured by surface resistivity in ohms per square. BMS 10-21 specifies the allowable resistivity range — if the surface resistivity is too high (too resistive), static charges accumulate. If too low (too conductive), there may be electrical hazard implications. The carbon black loading in CA7870 is calibrated to produce resistivity consistently within the specification window.

Fuel tank interior coating application requires specialized procedures, materials handling, and safety protocols due to the confined space, fuel vapor environment, and electrical safety considerations. Technicians applying CA7870 must follow all applicable confined space entry procedures, fuel tank safety regulations, and the Boeing AMM fuel tank maintenance procedures for the specific aircraft type.

Why Choose DeSoto CA7870?

• ✅ BMS 10-21 Qualified — Boeing-approved anti-static fuel tank coating
• ✅ Carbon-Filled Conductive — Dissipates static charge safely
• ✅ Fuel Resistant — Compatible with jet fuel and aviation gasoline
• ✅ Quart Kit — Right quantity for tank inspection and patch repairs
• ✅ PPG DeSoto Aerospace Quality — Leading aerospace fuel system coating brand

Applications

CA7870 is used for fuel tank interior coating on Boeing commercial aircraft, anti-static coating of fuel-wetted aerospace surfaces, and touch-up repair of fuel tank coating damage discovered during scheduled fuel tank inspections.

Frequently Asked Questions

Q: What is PPG DeSoto CA7870?
A: CA7870 is a black BMS 10-21 anti-static carbon-filled epoxy coating for aircraft fuel tank interiors — providing controlled electrical conductivity to dissipate static charge and prevent fuel ignition from electrostatic discharge.

Q: MPN for DeSoto CA7870 quart?
A: MPN is 7B7000000XBM22K.

Q: Why do fuel tanks need anti-static coating?
A: Static charge builds up from fuel flow across tank surfaces. Without anti-static coating to safely dissipate the charge to aircraft structure ground, electrostatic discharge sparks could ignite fuel vapors — a serious fire and explosion hazard.

Q: What is BMS 10-21 Type IV?
A: BMS 10-21 is a Boeing Material Specification for anti-static and conductive coatings used on aerospace surfaces. Type IV specifies the particular electrical resistivity and performance category applicable to CA7870.

Q: Is CA7870 suitable for all aircraft fuel tanks?
A: CA7870 is qualified to BMS 10-21 for Boeing aircraft. Verify the applicable maintenance specification for your specific aircraft type and fuel tank repair category before application.