Construction Sikaflex ® 1a One part polyurethane, elastomeric sealant/adhesive Description

Tooling and Finishing Tool sealant to ensure full contact with joint walls and remove air entrapment. Joint dimension should allow

for 1/4 inch minimum and 1/2 inch maximum thickness for sealant. Proper design is 2:1 width to depth ratio,

For use in horizontal joints in traffic areas, the absolute minimum depth of the sealant is 1/2 in. and closed cell

backer rod is recommended.

Removal  

Use personal protective equipment (chemical resistant gloves/goggles/clothing). Without direct contact, remove

spilled or excess product and placed in suitable sealed container. Dispose of excess product and container in

accordance with applicable environmental regulations.

Over Painting

Allow 1-week cure at standard conditions when using Sikaflex-1a in total water immersion situations and prior

to painting.

Limitations 

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When overcoating with water, oil and rubber based paints, compatibility and adhesion testing is essential.

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Sealant should be allowed to cure for 7 days prior to overcoating.

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Avoid exposure to high levels of chlorine. (Maximum continuous level is 5 ppm of chlorine.)

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Maximum depth of sealant must not exceed 1/2 in.; minimum depth is 1/4 in.

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Maximum expansion and contraction should not exceed 25% of average joint width.

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Do not cure in the presence of curing silicone sealants.

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Avoid contact with alcohol and other solvent cleaners during cure.

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Do not apply when moisture-vapor-transmission condition exists from the substrate as this can cause

 bubbling within the sealant.

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Use opened cartridges and uni-pac sausages the same day.

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When applying sealant, avoid air-entrapment.

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Since system is moisture-cured, permit sufficient exposure to air.

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White color tends to yellow slightly when exposed to ultraviolet rays.

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Light colors can yellow if exposed to direct gas fired heating element.

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The ultimate performance of Sikaflex-1a depends on good joint design and proper application with joint

 surfaces properly prepared.

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The depth of sealant in horizontal joints subject to traffic is 1/2 in.

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Do not tool with detergent or soap solutions.

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Do not use in contact with bituminous/asphaltic materials.