M-1 Tech Paper

079213-4
B. Properties of the cured polyether sealant:
1. Tensile Properties (ASTM D-412) at 21 days
a. Tensile Stress: 330-psi min.
b. Elongation at Break: 290%
2. Shore A Hardness (ASTM D-2240) at 21 days: 45
3. Adhesion in Peel (TT-S-00230C, ASTM C 794)
4. Service Range: -40°F to 200° F (-40° to 93° C)
5. The sealant shall conform to Federal Specification TT-S-00230C, Type II,
Class A.
6. The sealant shall conform to ASTM C-920, Type S, Grade NS, Class 25.
7. The sealant shall be non-staining.
NOTE: TESTE WERE PERFORMED UNDER LABORATORY CONDITIONS USING PRODUCTION MATERIAL AND
IDEAL CURING CONDITIONS.
Part 3 - EXECUTION
3.01 SURFACE PREPARATION
A. The joint and adjacent substrate must be clean, dry, sound and free of surface
contaminants. Remove all traces of the old sealant, dust, laitance, grease, oils, curing
compounds, form release agents and foreign particles by mechanical means, i.e. –
sandblasting, grinding, etc., as approved by the manufacture and engineer. Blow joint free
of dust using compressed air line ensuring that no oil or contaminates corrupt the surface or
by brushing the joint to a clean surface.
3.02 APPLICATION
A. Joints:
1. Placement Procedure: Prime substrate as required based upon the
recommendations of the manufacturer and engineer, when field testing
indicates need, and when the joints will be subject to immersion after cure.
2. Install approved backer rod or bond breaker tape in all joints subject to
thermal movement to prevent three sided adhesion and to set the depth of
the sealant at a maximum of 1/2 in., measured at the center point of the
joint width. Approval of the backer rod or bond breaker tape shall be made
by the manufacture and engineer.
3. Joints shall be masked to prevent discoloration or application on unwanted
areas, as directed by the engineer. If masking tape is used, it shall not be
removed before tooling, yet must be removed before the initial cure of the
sealant. Do not apply the masking tape until just prior to the sealant
application.