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



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Construction

Sikaflex


®

-1a


One part polyurethane, elastomeric 

sealant/adhesive



Description

Sikaflex-1a is a premium-grade, high-performance, moisture-cured, 1-component, polyurethane-based, non-sag

elastomeric sealant. Meets Federal specification TT-S-00230C, Type II, Class A. Meets ASTM C-920, Type

S, Grade NS, Class 35, use T, NT, O, M, G, I; Canadian standard CAN/CGSB 19.13-M87.



Where to Use 

n

Designed for all types of joints where maximum depth of sealant will not exceed 1/2 in.



n

Excellent for small joints and fillets, windows, door frames, reglets, flashing, common roofing detail ap-

plications, and many construction adhesive applications.

n

Suitable for vertical and horizontal joints; readily placeable at 40°F.



n

Has many applications as an elastic adhesive between materials with dissimilar coefficients of expan-

sion.

n

Submerged conditions, such as canal and reservoir joints.



Advantages 

n

Eliminates time, effort, and equipment for mixing, filling cartridges, pre-heating or thawing, and cleaning



of equipment.

n

Fast tack-free and final cure times.



n

High elasticity - cures to a tough, durable, flexible consistency with exceptional cut and tear-resistance.

n

Stress relaxation.



n

Excellent adhesion - bonds to most construction materials without a primer.

n

Excellent resistance to aging, weathering.



n

Proven in tough climates around the world.

n

Odorless, non-staining.



n

Jet fuel resistant.

n

Certified to the NSF/ANSI Standard 61 for potable water.



n

Urethane-based; suggested by EPA for radon reduction.

n

Paintable with water-, oil- and rubber-based paints.



n

Capable of ±35% joint movement.



Chemical Resistance  Good resistance to water, diluted acids, and diluted alkalines. Consult Technical Service for specific data.

Packaging

10.1 fl. oz. (300 mL), 20 fl. oz. (591 mL), 4.5 gal (17 L) in a 5 gal pail, 52 gal (197 L) in a 55 gal drum



Product Data Sheet

Edition 5.13.2016

Sikaflex-1a

Typical Data 

(Material and curing conditions @ 73°F (23°C) and 50% R.H.)

Shelf Life

10.1 fl. oz. cartridges

12 months

20 fl. oz. uni-pac sausages

12 months

5 gallon pail

6 months

55 gallon drum

6 months

Storage Conditions

Store at 40°-95°F (4°-35°C). Condition material to 65°-75°F before using.



VOC Content

40 g/L


Colors

White, colonial white, aluminum gray, limestone, black, dark bronze, capitol tan, stone and

medium bronze. Special architectural colors on request.

Application Temperature

40° to 100°F. Sealant should be installed when joint is at mid-range of its anticipated

movement.

Service Range

-40° to 170°F



Curing Rate

Tack-free time

3 to 6 hours

Tack-free to touch

3 hours

Final cure



4 to 7 days

Tear Strength (ASTM D-624)

55 lb./in.



Shore A Hardness (ASTM C-661)

21 day    40±5



Movement Capability (ASTM C-719) 

  +/- 35%

Tensile Properties (ASTM D-412)

21 day


Tensile Stress

175 psi (1.21 MPa)

Elongation at Break

550%


Stress at 100%

85 psi (0.59 MPa)



Adhesion in Peel (TT-S-00230C, ASTM C 794)

Substrate

Peel Strength

Adhesion Loss

Concrete

20 lb.


0%

Aluminum

20 lb.

0%

Glass



20 lb.

0%

Weathering Resistance

Excellent

SEALANT VALIDATION

Issued to:  Sika Corporation

Product:    Sikaflex

®

-1A

C719: 

Pass ____  Ext:+35%    Comp:-35%



Substrate: 

Mortar, Aluminum, Glass 

[mortar substrate primed with Sika Primer 429]

C661: 

Rating 40



Validation Date: 8/3/12 − 8/2/17

No. 0812-S11211

Copyright © 2012



RESULTS MAY DIFFER BASED UPON STATISTICAL VARIATIONS DEPENDING UPON MIXING METHODS AND EQUIPMENT

TEMPERATURE, APPLICATION METHODS, TEST METHODS, ACTUAL SITE CONDITIONS AND CURING CONDITIONS.

PRIOR TO EACH USE OF ANY SIKA PRODUCT, THE USER MUST ALWAYS READ AND FOLLOW THE WARNINGS AND 

INSTRUCTIONS ON THE PRODUCT’S MOST CURRENT PRODUCT DATA SHEET, PRODUCT LABEL AND SAFETY DATA 

SHEET WHICH ARE AVAILABLE ONLINE AT HTTP://USA.SIKA.COM/ OR BY CALLING SIKA’S TECHNICAL SERVICE DE-

PARTMENT AT 800.933.7452 NOTHING CONTAINED IN ANY SIKA MATERIALS RELIEVES THE USER OF THE OBLIGATION 

TO READ AND FOLLOW THE WARNINGS AND INSTRUCTIONS FOR EACH SIKA PRODUCT AS SET FORTH IN THE CUR-

RENT PRODUCT DATA SHEET, PRODUCT LABEL AND SAFETY DATA SHEET PRIOR TO PRODUCT  USE.

Construction

Visit our website at usa.sika.com 

1-800-933-SIKA NATIONWIDE

Regional Information and Sales Centers. For the location of your nearest Sika sales office, contact your regional center.

Sika Corporation 

Sika Canada Inc. 

Sika Mexicana S.A. de C.V. 

201 Polito Avenue 

601 Delmar Avenue 

Carretera Libre Celaya Km. 8.5

Lyndhurst, NJ 07071 

Pointe Claire 

Fracc. Industrial Balvanera

Phone: 800-933-7452 

Quebec H9R 4A9 

Corregidora, Queretaro

Fax: 201-933-6225 

Phone: 514-697-2610 

C.P. 76920

 

Fax: 514-694-2792 



Phone: 52 442 2385800

 

 



Fax: 52 442 2250537

KEEP CONTAINER TIGHTLY CLOSED. KEEP OUT OF REACH OF CHILDREN. NOT FOR INTERNAL CONSUMPTION. FOR INDUSTRIAL USE ONLY. FOR PROFESSIONAL USE ONLY.

For further information and advice regarding transportation, handling, storage and disposal of chemical products, users should refer to the 

actual Safety Data Sheets containing physical, ecological, toxicological and other safety related data. Read the current actual Safety Data Sheet 

before using the product. In case of emergency, call CHEMTREC at 1-800-424-9300, International 703-527-3887.

Prior to each use of any Sika product, the user must always read and follow the warnings and instructions on the product’s most current Product 

Data Sheet, product label and Safety Data Sheet which are available online at http://usa.sika.com/ or by calling Sika’s Technical Service Depart-

ment at 800-933-7452. Nothing contained in any Sika materials relieves the user of the obligation to read and follow the warnings and instruction 

for each Sika product as set forth in the current Product Data Sheet, product label and Safety Data Sheet prior to

product use.

SIKA warrants this product for one year from date of installation to be free from manufacturing defects and to meet the technical properties on 

the current Product Data Sheet if used as directed within shelf life. User determines suitability of product for intended use and assumes all risks. 

Buyer’s sole remedy shall be limited to the purchase price or replacement of product exclusive of labor or cost of labor. NO OTHER WARRANTIES

EXPRESS OR IMPLIED SHALL APPLY INCLUDING ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. SIKA 

SHALL NOT BE LIABLE UNDER ANY LEGAL THEORY FOR SPECIAL OR CONSEQUENTIAL DAMAGES. SIKA SHALL NOT BE RESPONSIBLE FOR 

THE USE OF THIS PRODUCT IN A MANNER TO INFRINGE ON ANY PATENT OR ANY OTHER INTELLECTUAL PROPERTY RIGHTS HELD BY OTHERS.

SALE OF SIKA PRODUCTS ARE SUBJECT SIKA’S TERMS AND CONDITIONS OF SALE AVAILABLE AT HTTP://USA.SIKA.COM/ OR BY

CALLING 201-933-8800.

ISO 9001

Certificate # FM 69711

RC 14001

Certificate # RC 510999

Sika and Sikfaflex are registered trademarks.

Printed in Canada.

Coverage 

How to Use

Surface Preparation  Clean all surfaces. Joint walls must be sound, clean, dry, frost-free, and free of oil and grease. Curing compound

residues and any other foreign matter must be thoroughly removed. A roughened surface will also enhance

bond. Install bond breaker tape or backer rod to prevent bond at base of joint.

Priming

Priming is not usually necessary. Most substrates only require priming if testing indicates a need or where

sealant will be subjected to water immersion after cure.

Consult Sikaflex Primer Technical Data Sheet or Technical Service for additional information on priming.



Application

Recommended application temperatures: 40°-100°F.

For cold weather application, condition units at approximately 70°F; remove prior to using. For best performance,

Sikaflex-1a should be gunned into joint when joint slot is at mid-point of its designed expansion and contrac-

tion. Place nozzle of gun into bottom of the joint and fill entire joint. Keep the nozzle in the sealant, continue

on with a steady flow of sealant preceding the nozzle to avoid air entrapment. Avoid overlapping of sealant to

eliminate entrapment of air.

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 

n

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



n

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

n

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



n

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

n

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



n

Do not cure in the presence of curing silicone sealants.

n

Avoid contact with alcohol and other solvent cleaners during cure.



n

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

 bubbling within the sealant.

n

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



n

When applying sealant, avoid air-entrapment.

n

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



n

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

n

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



n

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

 surfaces properly prepared.

n

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



n

Do not tool with detergent or soap solutions.

n

Do not use in contact with bituminous/asphaltic materials.



PRIOR TO EACH USE OF ANY SIKA PRODUCT, THE USER MUST ALWAYS READ AND FOLLOW THE WARNINGS AND 

INSTRUCTIONS ON THE PRODUCT’S MOST CURRENT PRODUCT DATA SHEET, PRODUCT LABEL AND SAFETY DATA 

SHEET WHICH ARE AVAILABLE ONLINE AT HTTP://USA.SIKA.COM/ OR BY CALLING SIKA’S TECHNICAL SERVICE DE-

PARTMENT AT 800.933.7452 NOTHING CONTAINED IN ANY SIKA MATERIALS RELIEVES THE USER OF THE OBLIGATION 

TO READ AND FOLLOW THE WARNINGS AND INSTRUCTIONS FOR EACH SIKA PRODUCT AS SET FORTH IN THE CUR-

RENT PRODUCT DATA SHEET, PRODUCT LABEL AND SAFETY DATA SHEET PRIOR TO PRODUCT  USE.

10.1 oz Cartridge: Yield in Linear feet

Depth

1/4"


3/8"

1/2"


Width

1/4"


24.3

3/8"


16.2

10.8


1/2"

12.1


8.1

6.1


3/4"

8.1


5.4

4.0


1"

3.0


1.25"

2.4


1.5"

2.0


20 oz Sausage: Yield in Linear feet

Depth


1/4"

3/8"


1/2"

Width


1/4"

48.1


3/8"

32.1


21.4

1/2"


24.1

16.0


12.0

3/4"


16.0

10.7


8.0

1"

6.0



1.25"

4.8


1.5"

4.0


1 gallon: Yield in Linear feet

Depth 


1/4"

3/8"


1/2"

Width


1/4"

307.9


3/8"

205.3


136.8

1/2"


153.9

102.6


77.0

3/4"


102.6

68.4


51.3

1"

38.5



1.25"

30.8


1.5"

25.7



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