PPG PR1772B-1 (100-ml-Semkit)

Additional Product Information

Aircraft engineers and MRO teams working on everything from the most advanced military aircraft in the world to commercial airlines carrying millions of passengers each year rely on PPG PR1772B‑1 because it delivers exceptional sealing performance with significant weight savings. Its low‑density formulation reduces aircraft operating weight while still providing the fuel resistance, flexibility and durability required for fuselage, structural, and aerodynamic smoothing applications. Ground crew trust PPG PR1772B‑1 because the B‑1 work life and Semkit packaging ensure fast, clean, predictable application during both scheduled maintenance and urgent AOG events. In short, it’s the lightweight structural sealant that keeps modern fleets safe, efficient and flight‑ready.

Key Technical Specs for PG PR1772B-1

• What it is: PPG PR1772B‑1 is a low‑weight, two‑part, Class B polysulfide fuselage sealant, supplied here in a 100‑ml Semkit format. It’s specifically marketed as a low‑weight fuselage sealant that still behaves like a full‑performance structural sealant.
• Performance & properties:
• Low‑weight formulation: Up to 30% weight savings per unit volume compared with traditional fuselage sealants, which is significant for operators chasing weight reduction and fuel burn improvements.
• Class B paste: Low‑sag, thixotropic paste for extrusion gun or spatula application. Odeal for fillets and structural beads rather than self‑levelling work.
• Work life (B‑1): Approx. 1‑hour application life at standard conditions.
• Service temperature:

• Fuel exposure: Cured sealant maintains excellent elastomeric properties after exposure to jet fuel and avgas, so it’s suitable in and around fuel‑affected zones.
• Most common uses (technically):
• Fuselage sealing and pressurization sealing
• Aerodynamic smoothing
• Corrosion‑inhibitive structural sealing
• Weight‑sensitive applications where traditional heavier sealants are being replaced.

Approvals & Specifications for PG PR1772B-1

OEM / spec alignment:

• Boeing:
• BMS 5‑142 Type II Class B‑1
• Associated primers/topcoats compatibility: PR‑1772 Class B is designed to work over common Boeing primers and finishes such as BMS 5‑89 and several BMS 10‑11 and BMS 10‑60 epoxy/PU systems.

Typical Aircraft MRO / AOG Applications for PG PR1772B-1

• Where it’s used in the aircraft:

• Fuselage skin and lap joints
• Pressurised fuselage joints and seams
• External/flush areas for aerodynamic smoothing
• Structural corrosion‑inhibitive sealing around fasteners, joints and panel edges

• Why important to keep in stock:

• Spec‑driven: If your AMM/SRM specifies BMS 5‑142 Type II Class B‑1, PR1772B‑1 is a direct match, so holding it in stock prevents delays waiting on a spec‑approved sealant.
• Weight‑critical repairs: When you’re doing structural rework or mods, this low‑weight sealant helps avoid adding unnecessary mass. That’s valuable in repeated repairs or long‑term corrosion programs.
• Predictable B‑1 cure: A ~1‑hour work life is ideal for planned MRO tasks and controlled AOG structural sealing. Long enough to tool and inspect, short enough not to delay return‑to‑service.

Compatibility & Safety Notes for PG PR1772B-1

• Substrate & coating compatibility: PR‑1772 Class B is intended for use on standard aircraft aluminium and structural substrates, over typical Boeing primer/topcoat systems, supporting its role as a structural/fuselage sealant in existing paint stacks.

• Physical behavior:

• Low‑sag paste: Holds fillet shapes on vertical surfaces and under fuselage geometries.
• Chemistry: Two‑part, chemically‑curing polysulfide, curing at room temperature to a resilient, flexible elastomeric seal.
• Fuel & fluid resistance: Designed to retain elasticity after limited exposure to jet fuel and aviation gasoline, making it robust around fuel splash or vapour areas.

• Safety: Listed as hazardous material (UN3082, Class 9, PG III), so it must be handled and shipped under standard hazmat protocols.

Packaging & Procurement for PG PR1772B-1 (matched to the Aerospheres page and common market packs)

• Product format:

• PPG PR1772B‑1 (100‑ml‑Semkit):  a pre‑measured 100 ml Semkit containing base and accelerator, mixed in‑pack prior to use.

• What you actually get:

• A single 100‑ml (0.1 L / ~3.38 fl‑oz) Semkit cartridge engineered for use in a Semkit‑type gun.
• The kit mixes the two components in the correct ratio, giving you a B‑1 work life after mixing.
• Ideal volume for localized fuselage repairs and sealing runs rather than large‑scale tank sealing.

• Why Semkit is valuable in MRO/AOG:

• Reduces mix‑ratio errors.
• Minimises waste.
• Portable, easy to carry in AOG kits and line‑station tool stores.

Why PG PR1772B-1 is Chosen for AOG / MRO

• Weight savings: Up to 30% lighter than traditional fuselage sealants per unit volume. Directly supporting airline and military weight‑reduction and fuel‑burn programmes.
• Spec‑driven compliance: Directly meets BMS 5‑142 Type II Class B‑1, so engineering and QA have a clean spec line to reference.
• Predictable handling: B‑1 work life + low‑sag behaviour give ground crew and aviation engineers a familiar, predictable sealant in repairs and mods.
• Versatility: Covers fuselage sealing, aerodynamic smoothing and corrosion‑inhibitive structural work, so a single product supports multiple task cards.
• AOG suitability: Semkit format, known cure profile and OEM spec status make it an ideal grab‑and‑go structural sealant for AOG teams.

Practical Suggestions for Your Team (AOG mindset) for PG PR1772B-1

• Stock by fleet/spec: If your Boeing fleets call up BMS 5‑142 Type II Class B‑1, treat PPG PR1772B‑1 as a core AOG/MRO sealant and keep it at key line stations and heavy‑check bases.
• Maintain shelf‑life discipline: Track expiry closely (e.g., 9‑month shelf life) and rotate stock so the AOG kits always contain in‑date Semkits.
• Standardise usage: Align AMM/SRM procedures and local work cards to reference PR1772B‑1 explicitly wherever your spec allows, so technicians know exactly which sealant to pull for fuselage/structural tasks.
• Train on Semkit mixing: Ensure all ground crew and MRO technicians are comfortable with Semkit mixing and application within the B‑1 work‑life window to avoid waste and rework.

Manufacture / Aviation Spec Codes for PG PR1772B-1

• Manufacturer: PPG Aerospace (PRC‑DeSoto) - PR‑series aircraft sealants.
• Primary aviation spec:

• Boeing: BMS 5‑142 Type II Class B‑1

• Related compatibility specs (coatings/primers): From PPG’s TDS for PR‑1772 Class B, compatible with systems including:

• BMS 5‑89 - corrosion inhibiting primer
• BMS 10‑11 (various grades) - epoxy primers
• BMS 10‑20 Type II - epoxy primer
• BMS 10‑60 - polyurethane topcoats (Type I & II, Grade A).

Alternative Names & Descriptions for PG PR1772B-1

• PR1772B‑1
• PPG PR‑1772 B‑1
• PR‑1772 Class B‑1 low‑weight sealant
• 1772B‑1 Semkit
• Low‑weight fuselage sealant (PR‑1772)
• BMS 5‑142 Type II Class B‑1 sealant