The PR-1700 Corrosion-Inhibitive Sealant Family Explained (PR-1771 / 1773 / 1775 / 1782)
This article is part of our ongoing PPG Aerospace corrosion-inhibiting sealants series, building on prior guides covering PR-1436-GPT, Mastinox D40, CA1000/CA1010, and other CI-focused materials. This installment breaks down the PR-1700 family, PPG’s widely used line of faying-surface, fuel-tank, fuselage, and low-density, corrosion-inhibitive sealants, while providing direct GSA Advantage access for streamlined federal procurement.
The amount of different sealants used in aviation maintenance and repair is staggering. It takes a lot of materials on every aircraft type to keep them sealed, secure, and protected against corrosion. PPG Aerospace is a leading manufacturer of corrosion-inhibiting sealants, and Greenwood Aerospace is your trusted source to procure PPG Aerospace products for your military or federal aviation maintenance organizations.
Let’s take a look at these products, what makes them unique or specific to a task, and most importantly, how you can quickly source them through GSA Advantage.
1. Quick Procurement Access: PR-1700 Sealants on GSA Advantage
To make the process as painless and quick as possible, we have built this table to get you straight to the source.
With U.S. Department of State ITAR registration and AS9120B QMS certification, Greenwood Aerospace delivers compliant solutions for defense export requirements.
Registration Information:
- UEI: KVSUYYSJS174 | DUNS: 604006874 | Cage: 2Y735
- ITAR DDTC Export Compliant | AS9120B Certified
- NAICS: 488190, 336413, 332722, 336411, 481212, 532411
Get in touch for product inquiries, volume pricing, or rush orders:
gsasales@greenwood.aero | 580-865-6000 | 833-472-3289 (833-GSA-EBUY).
2. Overview of the PR-1700 Corrosion‑Inhibitive Sealant Family
PPG Aerospace’s PR-1700 line represents the mid‑ to high‑viscosity segment of its CI portfolio, positioned between the low‑viscosity CA‑Series jointing compounds and the sprayable PR‑1436GPT coatings. These two‑part polysulfide systems were developed specifically for:
.png)
- Faying‑surface protection on aircraft structures, wing‑tank interfaces, and bulkhead joints.
- Fuel‑tank and wet‑wing sealing, where long‑term exposure to jet fuel, hydraulic fluids, and de‑icing agents is expected.
- Low‑density applications where weight savings are mission‑critical (UAVs, maritime patrol aircraft, next‑gen fighters).
The family is already in use across a broad spectrum of federal fleets—including DoD aviation assets, DHS‑operated aircraft, DOI‑owned OAS platforms, Civil Air Patrol (CAP) trainers, and contractor‑maintained aircraft—delivering consistent corrosion protection under demanding operational environments.
3. Shared Performance Characteristics Across PR-1700 Sealants
All members meet the same baseline MIL‑PRF/AMS requirements for aerospace CI sealants, allowing program managers to substitute within the family when geometry, cure time, or weight constraints differ.
4. Individual Product Profiles
Each product in this family is built with the shared goal of preventing and inhibiting corrosion, but they differ, tailored to specific tasks. Here are our technical overviews for each type in the PR-1700 series that we offer:
4.1 PR‑1771 – Solid Green CI Sealant for Faying Surfaces
- Formulation: High‑viscosity, non‑flowing polysulfide (Permapol® P‑5).
- Key Specs:
- Service temp – 54 °C → 121 °C (‑65 °F → 250 °F).
- Cured specific gravity 1.14; non‑volatile content 92.5 %.
- Ultimate Shore A 45; tensile strength 1.28 MPa; elongation ≈ 395 %.
- Peel strength on Alclad 2024 ≈ 5.8 N/mm (no‑primer).
- Unique Feature: Green pigment provides visual confirmation of coverage in tight joints.
- Typical Use: Fixed‑wing and rotary‑wing structural joints, bulkhead‑to‑skin interfaces, and any location where a non‑flowing, high‑strength seal is required.
4.2 PR‑1772 – A/B Fuselage Sealant (Semkit)
- Formulation: Low‑weight, chemically curing polysulfide (B‑2 grade).
- Key Specs:
- Service temp – 54 °C → 121 °C; short‑term up to 135 °C.
- Cured specific gravity 1.09; non‑volatile 91 %.
- Ultimate Durometer A 45; tensile strength ≈ 190 MPa; elongation ≈ 280 %.
- Peel strength on Alclad 2024 ≈ 35 pli (≈ 156 N/mm).
- Packaging: Two‑part Semkit cartridge reduces waste and ensures consistent mix ratios (10:100 wt%).
- Typical Use: Line‑maintenance fuselage repairs, spot‑touch‑ups, and corrosion‑mitigation on aircraft skins.
4.3 PR‑1773 – AMS 3284 CI Sealant (Class B1/2 & B2)
- Formulation: Low‑adhesion, non‑chromate polysulfide (Brookfield #7 ≈ 11 600 cP).
- Key Specs (Class B2 example):
- Service temp – 54 °C → 121 °C; excursions to 149 °C.
- Cured specific gravity 1.65; non‑volatile 98 %.
- Ultimate Durometer A 55; peel strength < 1 pli on AMS‑specified substrates (indicates true “low‑adhesion” behavior).
- Application Flexibility: Dual‑cure options (B‑1/2 ≈ 0.5 h tack‑free, B‑2 ≈ 2 h) let technicians match working time to job size.
- Typical Use: Access‑door seals, form‑in‑place (FIP) gaskets, and exterior butt‑joints where easy removal is advantageous.
4.4 PR‑1775 – Non‑Chromate CI Sealant
- Formulation: Same polysulfide base as PR‑1771 but formulated without any chromium‑based additives.
- Key Specs: Mirrors PR‑1771 performance (Shore A 45, tensile ≈ 1.3 MPa) while meeting strict environmental mandates.
- Typical Use: Programs transitioning away from chromated materials (e.g., DoD’s Hazard‑Reduction initiatives).
4.5 PR‑1776 – Multirole CI / Fuel‑Tank Sealants
All variants store ≥ 9 months (‑40 °F for frozen cartridges) and are compatible with the same surface‑prep procedures (solvent cleaning, lint‑free cloth, AMS 3819).
4.6 PR‑1782 – Low‑Density Class C CI Sealant
- Formulation: Low‑viscosity polysulfide (Brookfield #6 ≈ 1 200 cP).
- Key Specs:
- Service temp – 54 °C → 121 °C; short‑term excursions to 135 °C.
- Cured specific gravity 1.11; non‑volatile 88 %.
- Ultimate Durometer A 52; tensile 1.7 MPa; elongation ≈ 350 %.
- Peel strength on Alclad 2024 ≈ 175 pli (≈ 39 N/mm) – the highest among the family, reflecting its “low‑adhesion” design for easy removal.
- Weight Savings: Up to 30% less mass versus traditional polysulfides, ideal for UAVs, maritime patrol aircraft, and any platform where every gram counts.
- Typical Use: Brush‑applied fastener sealing in fuel tanks, lightweight composite airframes, and retrofit programs requiring minimal added weight.
5. Choosing the Correct PR-1700 Sealant for Your Fleet
Tip: When a program requires a specific cure time, select the appropriate “B‑1/2” or “B‑2” mix ratio. Faster cure (B‑1/2) yields tack‑free in ≤ ½ h, while B‑2 provides a longer working window (≈ 2 h) for larger joints.
6. Understanding the PR-1700 Lineup in the PPG CI Ecosystem
The PR-1700 family bridges the gap between:
- CA‑Series Jointing Compounds: low‑viscosity, high‑strength adhesives for structural bonding.
- Mastinox D40 & PR‑1436GPT: sprayable or brush‑applied CI coatings for large‑area corrosion protection.
Together, they give federal and defense aviation programs a single‑source, end‑to‑end solution for:
- Faying‑surface sealing (structural joints, bulkheads).
- Fuel‑tank integrity (wet‑wing, integral tanks).
- Weight‑critical repairs (UAVs, maritime patrol).
Because all PR-1700 products are stocked on GSA Advantage, acquisition officers can leverage existing Federal Supply Schedule contracts, benefit from pre‑negotiated pricing, and obtain rapid, compliant delivery through Greenwood Aerospace. Technical support, including surface‑preparation guidance (SAE AIR 4069) and compatibility matrices, is available for successful field implementation.
7. Closing Summary
PPG’s PR-1700 series of sealants are excellent corrosion inhibitors that give end users years of fuel resistance and flexible applications that are made to keep aircraft in the air and lethal to the enemy.
Compliant with most military aircraft thanks to MIL-PRF and AMS compliance, they are a low-toxicity option that provides weight saving. It may not seem like much until you realize how much sealant, primer, paint, and top coats weigh on large aircraft; you are looking at many hundreds of pounds over the entire aircraft.
Federal buyers seeking a proven, government‑approved CI sealant portfolio should consider the PR-1700 family as the go‑to solution for current and future aircraft sustainment programs.
Company Identifiers:
- UEI: KVSUYYSJS174
- DUNS: 604006874
- Cage Code: 2Y735
- NAICS: 488190, 336413, 332722, 336411, 336413, 481212, 532411
Need assistance with product availability, bulk orders, or expedited shipping? Contact our team at gsasales@greenwood.aero or call 580-865-6000 / 833-GSA-EBUY (833-472-3289).
.svg)
.png)
