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

PRC-DESOTO PR 1776M

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.
Product Family

PRC-DESOTO PR 1776M

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TDS, SDS & Technical Documents

Technical Specifications

General Properties
Component System
Describes the number of components that must be supplied, mixed, or activated before application or cure.
Two Part
Specific Gravity
Specific gravity (SG) is the ratio of the density of a substance to the density of a reference substance; equivalently, it is the ratio of the mass of a substance to the mass of a reference substance for the same given volume. For liquids, the reference substance is almost always water (1), while for gases, it is air (1.18) at room temperature. Specific gravity is unitless.
1.29
Thermal Properties
Service temperature
-54 to 121 °C
Other Properties
Storage Temperature
4.5 - 27 °C
Mechanical Properties
Elongation
Elongation is the process of lengthening something. It is a percentage that measures the initial, unstressed, length compared to the length of the material right before it breaks. It is commonly referred to as Ultimate Elongation or Tensile Elongation at break.
366 %

Additional Information

Technical properties

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 colorBlack / Off white-As supplied
Mixed colorDark brown-After mixing
Mix ratio by weight12:100 / 10:100-B-1/2 / B-2; Part A to Part B
Base viscosity11,100 (1,100)Poise (Pa-s)Brookfield #7 at 2 rpm
Application life0.5 / 2 / 4 / 6hB-1/2 / B-2 / B-4 / B-6 at 25 deg C, 50% RH
Tack-free time<8 / <16 / <24 / <30hB-1/2 / B-2 / B-4 / B-6
Cure to 30 Shore A12 / 24 / 48 / 80hB-1/2 / B-2 / B-4 / B-6
Technical properties

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 gravity1.29-Cured 14 days at 25 deg C, 50% RH
Nonvolatile content94%Typical cured material
Ultimate cure hardness50Shore ACured 14 days at 25 deg C, 50% RH
Tensile strength263 (1,812)psi (kPa)Cured 14 days at 25 deg C, 50% RH
Elongation366%Cured 14 days at 25 deg C, 50% RH
Low-temperature flexibilityNo cracking-At -54 deg C
Service temperature range-54 to 121deg CLimited excursions up to 182 deg C

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