Curing - Diamond DA20-C1 Maintenance Manual

Standard Practices - Structures
(1) Pre-fit the parts to be bonded to make sure that there is adequate clearance and mark out the
exact bonding area between the parts as necessary for paste application. Note the gap
between the parts.
(2) Disassemble the pre-fitted parts and prepare the surface for bonding by removing the peel-ply
or abrading the surface.
(3) Prepare resin.
(4) Prepare bonding paste.
(5) Wet all the bonding surfaces with a thin coat of mixed resin (not thickened).
(6) Apply the bonding paste with a putty knife or a piping bag. Apply bonding paste to a depth
appropriate with the bond gap, as determined by the trial fit. Avoid trapping air by contouring
the paste higher in the middle of the joint.
(7) Fit the parts and remove excess bonding paste as it is squeezed out.
(8) Immobilize the parts until the pre-cure is complete (approximately 24 hours at 20°C, 68°F).
(9) Do not disturb the bonded parts until the full pre-cured duration has been reached.
11.

Curing

A. Introduction
The following steps establish the procedure for curing a composite repair.
B. Material
Curing oven or a temporary enclosure with a heat source.
C. Procedure
(1) Precuring
Temperature: 20 - 25
Time: 24 hours
(2) Postcuring
Temperature: 60
Time: 15 hours
The post cure may be divided into sections, as long as the total time at the required temperature
is at least 15 hours.
(3) If you do not have an oven or a warming room, construct a temporary enclosure around the
repair area to entrap heat.
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o o
C (68 - 77 F)
o o o
C ± 5 C (140 F)
51-00-00
DA20-C1 AMM
DA201-C1
Rev 21