Extra 300/SC, Maintenance Manual, Page: 51 / 250

CHAPTER 20
PAGE 20
MAINTENANCE MANUAL EXTRA 300/SC
PAGE DATE: 12. February 2019
20-10-10 Firewall Sealant
For firewall sealing various products can be used (refer to
Chapter 51-30-04).
Replacement
1 Before using any product, read and understand the applicable
Technical Data Sheet (TDS) and Material Safety Data Sheet
(MSDS).
2 To ensure proper sealing and to avoid unintended chemical
reactions with other products always remove old firewall
sealant completely prior to application of new sealant.
3 Apply new firewall sealant with a thickness of 3 mm
(1/8 inch).
20-10-11 PR-812
Application
Also refer to PR-812 Technical Data Sheet (TDS) and
Material Safety Data Sheet (MSDS).
I M P O R T A N T Proper mixing and correct proportions are extremely
important to obtain required results.
1 Prepare PR-812 firewall sealant by mixing brown part A with
black part B with weight ratio 2.5:100.
2 Clean the surfaces to be sealed with solvents.
3 Immediately thereafter, dry these areas with a new dry cloth.
4 Seal the gap between the firewall and the respective com-
ponent with PR-812 firewall sealant. Minimum sealant
thickness on firewall side is 3 mm (1/8 inch).
Cure time @ 25°C (77°F), 50% RH for a fillet 3 mm
(1/8 inch) thick:
•
tack free: approx. 24 hours
•
to tough rubber: approx. 72 hours
•
to performance properties: approx. 14 days