PR 1775 B1/2

PPG PR-1775 Class B is a non-chromate, corrosion inhibitive sealant that acts as an effective barrier against the common causes of corrosion on aluminium alloys or between dissimilar metals. Service temperature is −54 to 121 °C (−65 to 250 °F), with short-term recurring exposures (approximately 6 hours) to 182 °C (360 °F). It is a two-part, manganese dioxide cured PERMAPOL™ P-5 polysulfide; the low sag, thixotropic paste is applied by extrusion gun or spatula. The cured sealant maintains excellent elastomeric properties after exposure to both jet fuel and aviation gas.

Application Properties (AMS 3265 Class B test methods)

• Colour: Part A black, Part B white, mixed grey; mix ratio by weight for B-1/2 A:B 12:100
• Base viscosity 1,000 P; slump (B-1/2) 3.81 mm
• B-1/2 (25 °C, 50% RH): application life ½ hour; tack free 4 hours; 30 Shore A in 6 hours

Performance (cured 14 days at 25 °C)

• Specific gravity 1.59; non-volatile content 94%; ultimate hardness 51 Shore A
• Peel strength (100% cohesive, AMS 2629 JRF/NaCl-H2O, 7 days at 60 °C): anodized aluminium 38, titanium 40, stainless steel 43, Alodine aluminium 43, IFT coating 38 pli (titanium and stainless steel primed with PR-148)
• Tensile strength 495 psi, 500 psi after 12 days in JRF at 60 °C; elongation 420% / 290%
• No corrosion or deterioration in galvanic and cyclic corrosion tests; no cracking or loss of adhesion at −54 °C; paintable and repairable to itself

Storage

• Two-part can kits, SEMCO™ cartridges and pre-mixed frozen cartridges
• At least 9 months below 27 °C (80 °F) in unopened containers; frozen cartridges at least 30 days below −40 °C (−40 °F)