Description
PR-1829 Class B is a rapid curing aircraft windshield and canopy sealant. It has a service temperature range from -80°F (-62°C) to 320°F (160°C), with intermittent excursions up to 420°F (216°C).
This material is designed for fillet sealing of glass, polycarbonate, acrylic and other aircraft sealing applications. The product contains no organic solvents and does not craze substrates. The cured sealant exhibits excellent resistance to UV and weather exposure.
PR-1829 Class B is a two-part, epoxy cured Permapol® P-3 polythioether compound. The uncured material is a low sag, thixotropic paste, suitable for application by extrusion gun or spatula. Unlike standard polysulfide windshield sealants, it can cure at low temperatures and is unaffected by changes in relative humidity.
This sealant has excellent adhesion to common aircraft substrates.
Surface Preparation
Use 220 grit or finer sandpaper to abrade plastic surfaces, and clean glass surfaces with Cerium Oxide polish. Clean the surfaces with solvents immediately before applying sealant to primed substrates.
Remove contaminants like dirt, grease, and processing lubricants before applying the sealant. Employ a progressive cleaning procedure using appropriate solvents and a new lint-free cloth that conforms to AMS 3819. Avoid using reclaimed solvents or tissue paper.
Always pour solvent on the cloth to avoid contaminating the solvent supply. Wash one small area at a time. Dry the surface with a second clean cloth before the solvent evaporates to prevent redeposition of contaminants on 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.