PR-1770A is a manganese dioxide cured sealant based on Permapol P-5 liquid polymers, a

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1 PR1770 PR1770 High Strength Fuel Tank Sealant PR-1770 is a two-part, high strength / temperature resistant, brushing sealant for use over a temperature range of -55 C to +180 C, with outstanding resistance to aircraft fuels and lubricating oils and resistance to degradation by phosphate ester type hydraulic oils. PR1770A LINK PR-1770A is a manganese dioxide cured sealant based on Permapol P-5 liquid polymers, a chemically modified, improved class of polysulphide polymers covered by US Patent 4,623,711. The uncured material is a thick liquid suitable for application by brush or roller. The cured sealant maintains excellent elastomeric properties after prolonged exposure to aircraft fuels. PR1770B LINK PR-1770 Class B is a two-part, manganese dioxide cured Permapol P-5 polysulfide compound. The uncured material is a low sag, thixotropic paste suitable for application by extrusion gun or spatula It cures at room temperature to form a resilient sealant having excellent adhesion to common aircraft substrates. PR1770C LINK PR-1770C is a manganese dioxide cured sealant based on Permapol P-5 liquid polymers, a chemically modified, improved class of polysulphide polymers covered by US Patent 4,623,711. The uncured sealant is a thick liquid suitable for application by brush or roller. The cured sealant maintains excellent elastomeric properties after prolonged exposure to aircraft fuels.

2 technical data PR-1770 Class A PR-1770A fuel tank sealant Description PR-1770A is a two-part, high temperature resistant, brushing sealant for use over a temperature range of -55 C to +180 C, with outstanding resistance to aircraft fuels and lubricating oils and resistance to degradation by phosphate ester type hydraulic oils. PR-1770A is a manganese dioxide cured sealant based on Permapol P-5 liquid polymers, a chemically modified, improved class of polysulphide polymers covered by US Patent 4,623,711. The uncured material is a thick liquid suitable for application by brush or roller. The cured sealant maintains excellent elastomeric properties after prolonged exposure to aircraft fuels. Application properties (typical) Colour Part A Black Part B White Mixed Dark grey Mixing ratio Part B:Part A, by weight 10:1 Viscosity of base compound Pa-s (poise), (Brookfield # 10 rpm) 22 (220) Application life and cure 25 C, 50% RH Cure time to Application Tack free 35 life time Durometer A (hours) (hours) (hours) A-1/2 1/2 <10 24 A-2 2 <24 36 Non-volatile content,% by weight 95 Performance properties (typical) Cured C, 50% RH Hardness, Durometer A A-1/2 55 A-2 55 Mixed S.G. 1.6 Peel strength, N/25mm (pli),100% cohesion Dry Stainless steel 204 (46) Titanium 177 (40) Epoxy primer 186 (42) Type III fuel ( C) Stainless steel 204 (46) Titanium 195 (44) Epoxy primer 195 (44) 3% NaCl solution ( C) Stainless steel 204 (46) Titanium 177 (40) Epoxy primer 195 (44) Tensile strength, MPa (psi) Standard cure 3.38 (522) 60 C 2.29 (334) Elongation, % at break Standard cure C 550 Resistance to hydrocarbons JRF immersion Weight loss, % 5.0 Flexibility - no cracks over mandrel Low temperature flexibility - no cracking, checking or loss of adhesion Note: The application and performance property values are typical for the material but are not intended for use in specifications or for acceptance inspection criteria because of variations in testing methods, conditions and configurations. PRC-DeSoto International PRC Aerospace Sealants PRC-DeSoto Europe, Ltd. Darlington Road, Shildon County Durham DL4 2QP, England Tel +44(0) Fax +44(0) info.europe@prc-desoto.com A PPG Industries Company Date issued: 12/97 Supersedes: 8/93

3 PR-1770A fuel tank sealant Surface preparation Immediately before applying sealant to metallic, chemically treated, or painted substrates, the surfaces should be cleaned with solvents to remove contamination such as dirt, grease, and/or processing lubricants. A progressive cleaning procedure should be employed using the appropriate solvents and new lint-free cloth (reclaimed solvents or tissue paper should not be used). Always pour solvent on to the cloth to avoid contaminating the solvent supply. Wash one small area at a time. It is important that the surface is dried with a second clean cloth prior to the solvent evaporating to prevent the redeposition of contaminants on to the substrate. Substrate composition can vary greatly. This can affect sealant adhesion. It is recommended that adhesion characteristics to a specific substrate be determined prior to application on production parts or assemblies. For information on specific substrate treatment please refer to the Surface Treatment leaflet which is available on request. Storage life The storage life of PR-1770A is nine months when stored at temperatures between 5 C and 25 C in the original unopened containers. Health precautions This product is safe to use and apply when recommended precautions are observed. Before using this product read and understand the Material Safety Data Sheet which provides information on health, physical and environmental hazards, handling precautions and first aid recommendations. An MSDS is available on request. Avoid overexposure. Obtain medical care in case of extreme exposure. All recommendations, statements, and technical data contained herein are based on tests we believe to be reliable and correct, but accuracy and completeness of said tests are not guaranteed and are not to be construed as a warranty, either expressed or implied. User shall rely on his own information and tests to determine suitability of the product for the intended use and assumes all risks and liability resulting from his use of the product. Seller s and manufacturer s sole responsibility shall be to replace that portion of the product of this manufacturer which proves to be defective. Neither seller nor manufacturer shall be liable to the buyer or any third person for any injury, loss, or damage directly or indirectly resulting from use of, or inability to use, the product. Recommendations or statements other than those contained in a written agreement signed by an officer of the manufacturer shall not be binding upon the manufacturer or seller.

4 technical data PR-1770 Class B PR-1770 Class B high strength fuel tank sealant Description PR-1770 Class B is a high strength, aircraft integral fuel tank sealant. It has a service temperature range from -65 F(-54 C) to 250 F(121 C), with intermittent excursions up to 360 F (182 C). This material is designed for fillet sealing of fuel tanks and other aircraft fuselage sealing applications. The cured sealant maintains excellent elastomeric properties after prolonged exposure to both jet fuel and aviation gas. PR-1770 Class B is a two-part, manganese dioxide cured Permapol P-5 polysulfide compound. The uncured material is a low sag, thixotropic paste suitable for application by extrusion gun or spatula It cures at room temperature to form a resilient sealant having excellent adhesion to common aircraft substrates. The following tests are in accordance with AMS 3269 Class B specification test methods. Application properties (typical) Color Part A Black Part B Light gray Mixed Dark gray Mixing ratio Part A:Part B By weight 10:100 Base viscosity (Brookfield 2 rpm), Poise (Pa-s) 12,000 (1200) Slump, inches (mm) Initial 50 Minutes 90 Minutes B-1/ (3.81) B (2.54) 0.20 (5.08) 0.30 (7.62) Application life and cure 77 F (25 C), 50% RH Cure time Application Tack free to 30 A life time Durometer (hours) (hours) (hours) B-1/2 1/2 <10 24 B-2 2 <24 48 Performance properties (typical) Cured F (25 C), 50% RH Cured specific gravity 1.59 Nonvolatile content, % 98 Ultimate cure hardness, Durometer A 55 Peel strength, pli (N/25 mm), 100% cohesion AMS 2629 JRF immersion, F (60 C) AMS 2471 (Anodized aluminum) 48 (214) AMS 4901 (Titanium)* 50 (222) AMS 5516 (Stainless steel)* 45 (200) MIL-C-5541 (Alodine aluminum) 50 (222) MIL-C (IFT coating) 49 (218) AMS 2629 JRF/NaCl-H 2 O immersion, F (60 C) AMS 2471 (Anodized aluminum) 55 (245) AMS 4901 (Titanium)* 58 (258) AMS 5516 (Stainless steel)* 56 (249) MIL-C-5541 (Alodine aluminum) 53 (236) MIL-C (IFT coating) 60 (267) *Primed with PR-148 Adhesion Promoter Tensile strength, psi (KPa) Standard cure, F (25 C), 50% RH 537 (3703) 12 days immersion in AMS F (60 C) 360 (2482) F (182 C) 465 (3206) 72 hours immersion in AMS F (60 C), F (49 C), F (121 C) 500 (3448) Elongation, % Standard cure, F (25 C), 50% RH days immersion in AMS F (60 C) F (182 C) hours immersion in AMS F (60 C), F (49 C), F (121 C) 200 Thermal rupture resistance - Retains pressure of 10 psi with only negligible deformation, both before and after immersion in AMS 2629 JRF. Low temperature -65 F (-54 C) - No cracking, checking or loss of adhesion. PRC Aerospace Sealants PRC-DeSoto International, Inc San Fernando Road, PO Box 1800 Glendale, California (818) Fax (818) (Formerly Courtaulds Aerospace, Inc.) Date issued: 2/99 Supersedes: 1/98

5 PR-1770 Class B high strength fuel tank sealant Corrosion resistance - No corrosion, adhesion loss, softening, or blistering after immersion in 2-layer salt water/ams 2629 JRF after F (60 C) F (71 C) F (82 C). Resistance to hydrocarbons F (60 C) immersed in AMS 2629 JRF. Weight loss, % 4.6 Swell, % 12 Flexibility - No cracks after bending 180 degrees over inch (3.18 mm) mandrel. Repairability to itself - Excellent to both fresh cured as well as fuel aged and abraded fillets. Resistance to other fluids - Excellent resistance to water, alcohols, petroleum-base and synthetic lubricating oils, and petroleum-base hydraulic fluids. Fungus resistance Non-nutrient Shaving and sanding - No rolling or tearing Note: The application and performance property values above are typical for the material, but not intended for use in specifications or for acceptance inspection criteria because of variations in testing methods, conditions and configurations. Surface preparation Immediately before applying sealant to primed substrates, the surfaces should be cleaned with solvents. Contaminants such as dirt, grease, and/or processing lubricants must be removed prior to sealant application. A progressive cleaning procedure should be employed using the appropriate solvents and new lint free cloth (reclaimed solvents or tissue paper should not be used). Always pour solvent on the cloth to avoid contaminating the solvent supply. Wash one small area at a time. It is important that the surface is dried with a second clean cloth prior to the solvent evaporating to prevent the redeposition of contaminants on the substrate. For a more thorough discussion of proper surface preparation, please consult the SAE Aerospace Information Report AIR This document is available through SAE, 400 Commonwealth Avenue, Warrendale, PA Mixing instructions PR-1770 Class B is supplied in a two-part kit. Mix according to the ratios indicated in the application properties section. Mix Part A and Part B separately to uniformity, then thoroughly mix entire contents of both parts of kit together taking care to avoid leaving unmixed areas around the sides or bottom of the mixing container. Storage life The storage life of PR-1770 Class B is at least 9 months when stored at temperatures below 80 F (27 C) in original unopened containers. Health precautions This product is safe to use and apply when recom-mended precautions are followed. Before using this product, read and understand the Material Safety Data Sheet (MSDS), which provides information on health, physical and environmental hazards, handling precautions and first aid recomendations. An MSDS is available on request. Avoid overexposure. Obtain medical care in case of extreme overexposure. For industrial use only. Keep away from children. For emergency medical information call For sales and ordering information call AEROMIX ( ). Substrate composition can vary greatly. This can affect sealant adhesion. It is recommended that adhesion characteristics to a specific substrate be determined prior to application on production parts or assemblies. Permapol is a trademark of PRC-DeSoto International, Inc., registered with the U.S. Patent Office. All recommendations, statements, and technical data contained herein are based on tests we believe to be reliable and correct, but accuracy and completeness of said tests are not guaranteed and are not to be construed as a warranty, either expressed or implied. User shall rely on his own information and tests to determine suitability of the product for the intended use and assumes all risks and liability resulting from his use of the product. Seller s and manufacturer s sole responsibility shall be to replace that portion of the product of this manufacturer which proves to be defective. Neither seller nor manufacturer shall be liable to the buyer or any third person for any injury, loss, or damage directly or indirectly resulting from use of, or inability to use, the product. Recommendations or statements other than those contained in a written agreement signed by an officer of the manufacturer shall not be binding upon the manufacturer or seller. Printed in U.S.A.

6 technical data PR-1770 Class C PR-1770C faying surface sealant Description PR-1770C is a two-part, high temperature resistant, faying surface sealant for use over a temperature range of -55 C to +180 C, with outstanding resistance to aircraft fuels and lubricating oils and resistance to degradation by phosphate ester type hydraulic oils. PR-1770C is a manganese dioxide cured sealant based on Permapol P-5 liquid polymers, a chemically modified, improved class of polysulphide polymers covered by US Patent 4,623,711. The uncured sealant is a thick liquid suitable for application by brush or roller. The cured sealant maintains excellent elastomeric properties after prolonged exposure to aircraft fuels. The following tests have been run in accordance with AIMS Application properties (typical) Colour Part A Black Part B Light grey Mixed Dark grey Mixing ratio Part B:Part A, by weight 10:1 Viscosity of base compound Pa-s (poise), (Brookfield # 2 rpm) 280 (2800) Application life and cure 25 C Application Assembly Cure time in life time faying surface (hours) (hours) (days) C C Non-volatile content,% by weight 95 Performance properties (typical) Cured C, 50% RH Hardness, Durometer A 55 Mixed S.G Peel strength, N/25mm (pli),100% cohesive failure Dry Stainless steel 240 (55) Titanium 230 (52) Epoxy primer 235 (53) Type III fuel ( C) Stainless steel 230 (52) Titanium 215 (49) Epoxy primer 220 (50) 3% NaCl solution ( C) Stainless steel 235 (53) Titanium 230 (52) Epoxy primer 235 (53) Tensile strength, MPa (psi) Standard cure 3.38 (522) 60 C 2.29 (334) Elongation, % at break Standard cure C 550 Resistance to hydrocarbons JRF immersion Weight loss, % 4.8 Flexibility - no cracks over mandrel Low temperature flexibility - no cracking, checking or loss of adhesion Note: The application and performance property values are typical for the material but are not intended for use in specifications or for acceptance inspection criteria because of variations in testing PRC-DeSoto International PRC Aerospace Sealants PRC-DeSoto Europe, Ltd. Darlington Road, Shildon County Durham DL4 2QP, England Tel +44(0) Fax +44(0) info.europe@prc-desoto.com A PPG Industries Company Date issued: 12/97 Supersedes: 11/97

7 PR-1770C faying surface sealant methods, conditions and configurations. Surface preparation Immediately before applying sealant to metallic, chemically treated, or painted substrates, the surfaces should be cleaned with solvents to remove contamination such as dirt, grease, and/or processing lubricants. A progressive cleaning procedure should be employed using the appropriate solvents and new lint-free cloth (reclaimed solvents or tissue paper should not be used). Always pour solvent on to the cloth to avoid contaminating the solvent supply. Wash one small area at a time. It is important that the surface is dried with a second clean cloth prior to the solvent evaporating to prevent the redeposition of contaminants on to the substrate. Substrate composition can vary greatly. This can affect sealant adhesion. It is recommended that adhesion characteristics to a specific substrate be determined prior to application on production parts or assemblies. For information on specific substrate treatment please refer to the Surface Treatment leaflet which is available on request. Storage life The storage life of PR-1770C is nine months when stored at temperatures between 5 C and 25 C in the original unopened containers. Health precautions This product is safe to use and apply when recommended precautions are observed. Before using this product read and understand the Material Safety Data Sheet which provides information on health, physical and environmental hazards, handling precautions and first aid recommendations. An MSDS is available on request. Avoid overexposure. Obtain medical care in case of extreme exposure. All recommendations, statements, and technical data contained herein are based on tests we believe to be reliable and correct, but accuracy and completeness of said tests are not guaranteed and are not to be construed as a warranty, either expressed or implied. User shall rely on his own information and tests to determine suitability of the product for the intended use and assumes all risks and liability resulting from his use of the product. Seller s and manufacturer s sole responsibility shall be to replace that portion of the product of this manufacturer which proves to be defective. Neither seller nor manufacturer shall be liable to the buyer or any third person for any injury, loss, or damage directly or indirectly resulting from use of, or inability to use, the product. Recommendations or statements other than those contained in a written agreement signed by an officer of the manufacturer shall not be binding upon the manufacturer or seller.