PR 1773 B1/2

PPG PR-1773 Class B is a low adhesion, non-chromate, corrosion inhibitive access door sealant. Service temperature is −54 to 121 °C, with intermittent excursions up to 149 °C. It is used for access doors and form-in-place (FIP) gaskets and is an effective barrier against corrosion on aluminium alloys and between dissimilar metals. It is a two-part, manganese dioxide cured polysulfide applied by extrusion gun or spatula and forms a removable seal. Tests are run to AMS 3284 Class B methods.

Application Properties (B-1/2)

• Colour: A black, B red, mixed dark red; mix ratio by weight 10:100
• Base viscosity 11,600 P (1160 Pa·s); slump 2.54 mm
• Application life 30 minutes; tack free under 4 hours; 20 Shore A in 6 hours

Performance

• Specific gravity 1.65; non-volatile content 98%; hardness 55 Shore A
• Peel below 4.44 N/25 mm, 100% adhesive failure (easy removal)
• No corrosion in galvanic cell tests with aluminium/titanium, aluminium/cadmium and aluminium/composite couples
• No cracking at −54 °C

Storage

• At least 9 months below 27 °C in unopened containers; frozen cartridges at least 30 days below −40 °C