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6. SEALANT CURING (Table 202)
A. Room temperature curing
Unless otherwise specified, room temperature curing properties are based on a temperature of 25°C (77°F) and 50 % relative humidity.
B. Accelerated curing
Accelerated curing of sealant can be accomplished in several ways. The procedure to be used is dependent on the type of sealant and other factors.
The cure of sealants can be accelerated by an increase in temperature and/or relative humidity. Warm circulating air, at a temperature not to exceed 50°C, (122°F) may be used to accelerate cure. Heat lamps may be used if the surface temperature of the sealant does not exceed 50°C (122°F). At temperatures above 50°C (122°F), the relative humidity will normally be so low (below 40%) that sealant curing will be retarded.
 
C. Curing of sealant
The times given in the table below are based on a temperature of 25°C (77°F) and 50% relative humidity. Any increase in either temperature or relative humidity will shorten these times and accelerate the sealant cure.
SEALANT CLASSES APPLICATION TIME
(MAXIMUM, HOURS) TACK-FREE TIME (MEAN, HOURS) CURING RATE
(MINIMUM, HOURS)
(TB 09-007) / / 1/2 4
(TB 09-900) / 2 24 48
(TB 09-019A) B-1/2 1/2 10 24
 B-2 2 10 72
(TB 09-001) A-1/2 1/2 8 24
 A-2 2 10 48
(TB 09-002) B-1/2 1/2 6 24
 B-2 2 20 48
(TB 09-907) / 10 / 336 (14 days)
(TB 09-013A) A-1/2 1/2 10 30
 A-2 2 18 48
(TB 09-902) C-2 2 16 72

Curing of sealants
Table 202
7. PREPARATION OF SURFACES
All surfaces to which sealant is to be applied shall be clean and dry. Remove all dust, lint and chips with a vacuum cleaner where necessary.
Do initial cleaning by scrubbing the surface with clean lintfree cloth moistened with solvent. The cloth should not be soaked to the point where dripping will occur.
Allow surfaces cleaned to dry for at least five minutes before sealant application.
WA
Validity : S / N 1 - 9999 20-00-09(BA) 204
(BA) JUN 02
 
8. MATERIALS REQUIRED (Table 203)
NOTE : The use of sealants and cleaning solvents is described in the maintenance practices of individual chapters where sealing is required. Use specified sealants and cleaning solvents.
Suitable substitutes may be used for sealing equipment.
DESIGNATION REFERENCE MANUFACTURER USE
Hand— or air—operated extrusion gun / Commercially available To inject sealant
Nozzles / Commercially available To apply sealant
Metallic spatula / Commercially available To mix sealants
　
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