PRC-DESOTO PR 1776M
Harmonization Code : 3506.10.00.00 | Prepared glues and other prepared adhesives, not elsewhere specified or included; products suitable for use as glues or adhesives, put up for retail sale as glues or adhesives, not exceeding a net weight of 1 kg
Main features
- Low-Density Fuel-Tank Sealing
- Multi-Grade Class B Work Life
- Fuel-Resistant Elastomeric Seal
Product Description
PPG PR-1776M Class B Polysulfide Sealant is a low-density, two-part manganese-dioxide-cured polysulfide sealant for integral fuel-tank fillets and aircraft fuselage sealing. The low-sag thixotropic paste is applied by extrusion gun or spatula and cures at room temperature. Class B-1/2, B-2, B-4, and B-6 variants provide application lives from 0.5 to 6 hours at 25 deg C and 50% RH. The cured sealant has a typical specific gravity of 1.29, Shore A hardness of 50, and 366% elongation after the standard cure. It remains elastomeric after prolonged exposure to aircraft fuels and limited contact with phosphate-ester hydraulic fluids.
Key features
- Low-density fuel-tank seal: A cured specific gravity of 1.29 suits weight-sensitive fuel-tank and fuselage sealing.
- Multiple Class B work lives: B-1/2, B-2, B-4, and B-6 grades provide 0.5- to 6-hour application lives.
- Fuel-exposed elastomeric performance: The cured sealant remains elastomeric after prolonged aircraft-fuel exposure.
Applications / Suitable for
- Fillet sealing of integral aircraft fuel tanks.
- Aircraft fuselage sealing.
TDS, SDS & Technical Documents
Technical Specifications
General Properties
Thermal Properties
Other Properties
Mechanical Properties
Additional Information
As supplied / before processing
Variant-specific times are typical at 25 deg C and 50% RH.
| Property | Value | Unit | Method / condition |
|---|---|---|---|
| Part A / Part B color | Black / Off white | - | As supplied |
| Mixed color | Dark brown | - | After mixing |
| Mix ratio by weight | 12:100 / 10:100 | - | B-1/2 / B-2; Part A to Part B |
| Base viscosity | 11,100 (1,100) | Poise (Pa-s) | Brookfield #7 at 2 rpm |
| Application life | 0.5 / 2 / 4 / 6 | h | B-1/2 / B-2 / B-4 / B-6 at 25 deg C, 50% RH |
| Tack-free time | <8 / <16 / <24 / <30 | h | B-1/2 / B-2 / B-4 / B-6 |
| Cure to 30 Shore A | 12 / 24 / 48 / 80 | h | B-1/2 / B-2 / B-4 / B-6 |
After processing / final state
Values are typical after 14 days at 25 deg C and 50% RH unless otherwise stated.
| Property | Value | Unit | Method / condition |
|---|---|---|---|
| Cured specific gravity | 1.29 | - | Cured 14 days at 25 deg C, 50% RH |
| Nonvolatile content | 94 | % | Typical cured material |
| Ultimate cure hardness | 50 | Shore A | Cured 14 days at 25 deg C, 50% RH |
| Tensile strength | 263 (1,812) | psi (kPa) | Cured 14 days at 25 deg C, 50% RH |
| Elongation | 366 | % | Cured 14 days at 25 deg C, 50% RH |
| Low-temperature flexibility | No cracking | - | At -54 deg C |
| Service temperature range | -54 to 121 | deg C | Limited excursions up to 182 deg C |
