PPG PR-1428 Class B is a low adhesion access door sealant. Service temperature is −54 to 121 °C, with intermittent excursions up to 135 °C. It is used for access doors and in the fabrication of form-in-place (FIP) gaskets, and can also protect electrical wires, terminals and equipment against fuel, moisture, dirt and short circuits. It is a two-part, manganese dioxide cured polysulfide, a low sag, thixotropic paste applied by extrusion gun or spatula that cures at room temperature to a removable seal. Tests are run to MIL-S-8784 Class B and OEM specification methods.
Application Properties (B-1/2)
- Colour: A black, B red, mixed dark red; mix ratio by weight 10:100
- Base viscosity 11,000 P (1100 Pa·s); slump 2.54 mm
- B-1/2: application life 1/2 hour; tack free under 4 hours; 20 Shore A in 10 hours
Performance
- Specific gravity 1.50; non-volatile content 97%; hardness 50 Shore A
- Peel below 4.44 N/25 mm, 100% adhesive failure (easy removal)
- Weight loss 5.0% after 7 days in JRF at 60 °C; no cracking at −54 °C
Storage and Packaging
- At least 12 months below 27 °C in unopened containers; kits and Semco cartridges
| Packing | 6 OZ / 100 ML or Pint Kit or 1 QT Kit |