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SikaForce®-840 L07

Structural elastic 2-component polyurethane adhesive

SikaForce®-840 L07 is a flexible, structural 2-component polyurethane adhesive, which cures at room temperature. It is designed for bonding composite or coated metal components with stable properties over large temperature span. The adhesive is characterized by fast curing and strength build-up. While uncured, it has very good non-sag and compressibility behavior.  

  • Combination of structural properties and flexibility
  • Stable mechanical properties over wide temperature range
  • Fast curing at room temperature and suitable for quick assembly
  • Good non-sag behavior
  • Excellent compressibility
  • Low smell
  • Does not contain solvents or PVC
 
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PRODUCT BENEFITS

  • Combination of structural properties and flexibility
  • Stable mechanical properties over wide temperature range
  • Fast curing at room temperature and suitable for quick assembly
  • Good non-sag behavior
  • Excellent compressibility
  • Low smell
  • Does not contain solvents or PVC
 

Areas of Application

SikaForce®-840 L07 is suitable for structural elastic bonding of composites (e.g., CFRP, GFRP) or coated metals in transportation and general industry.
This product is suitable for experienced professional users only. Tests with actual substrates and conditions have to be performed ensuring adhesion and material compatibility.  

Product Details

Typical Product Data
Properties

SikaForce®-840 L07 (A)

SikaForce®-840 (B)

Chemical base

Polyol

Isocyanate

Color (CQP001-1)

Black

Black

Density (uncured)

 

mixed (calculated)

1.16 g/cm3

1.27 g/cm3

1.21 g/cm3

Mixing ratio

by volume

by weight

100 : 100

100 : 109.5

Viscosity (CQP029-4)

at 10 s-1

22 Pa·s A

60 Pa·s A

Application temperature

15 ─ 30 °C

Open time (CQP046-11 / ISO 4587)

7 minutes B, C

Handling time (CQP046-11 / ISO 4587)

20 minutes B, C

Shore A hardness (CQP023-1 / ISO 48-4)

95 B

Tensile strength (CQP036-2 / ISO 527)

15 MPa B, D

Elongation at break (CQP036-2 / ISO 527)

100 % B, D

E-Modulus (CQP036-2 / ISO 527)

elongation 0.05 ─ 0.25 %

350 MPa B, D

Tensile lap-shear strength (CQP046-9 / ISO 4587)

15 MPa  B, C, D

Glass transition temperature (CQP509-1 / ISO 6721)

-45 °C  D

Shelf life

cartridge

pail

6 months E

12 months E

CQP = Corporate Quality Procedure

A) tested at 20 °C

B) 23 °C / 50 % r. h.

C) adhesive layer: 25 x 12.5 x 1.5 mm

D) cured for 1 week at 23 °CE) storage between 10 and 30 °C
Technical Information

CURE MECHANISM

SikaForce®-840 L07 cures by chemical reaction of the two components at room temperature. Higher temperatures accelerate the cure rate and decrease the open time. High humidity reduces the open time as well. In big bead applications, the generated exothermic heat of reaction can speed up the cure, reducing working and handling times.

After the open time is reached, the cure reaction proceeds very fast and the viscosity will increase significantly within minutes.

CHEMICAL RESISTANCE

In the view of potential chemical or thermal exposure, it is required to conduct a project related testing.

Application

Application Information

Surface preparation

Surfaces must be clean, dry and free from grease, oil and dust. Additional surface treatment depends on the specific nature of the substrates and is crucial for long lasting bond. All pre-treatment steps must be confirmed by preliminary tests on original substrates considering specific conditions in the assembly process.

Application

Cartridge: Extrude adhesive without mixer to equalize the filling levels. Attach the mixer and dispose the first few cm of the bead prior to the application.

If SikaForce®-840 L07 is dispensed from dual cartridges, it is recommended to use a pneumatic or electric piston gun. SikaForce®-840 L07 can also be processed from pails with adequate 2-component equipment.

If dispensed with 2-component equipment, the mixer needs to be tailored for the specific application.

 

For advice on selecting and setting up a suitable pump system, contact the System Engineering Department of Sika Industry.

Removal

Uncured SikaForce®-840 L07 may be removed from tools and equipment with Sika® Remover-208 or another suitable solvent.
Hands and exposed skin have to be washed immediately using hand wipes such as Sika® Cleaner-350H or a suitable industrial hand cleaner and water.

Do not use solvents on skin.

STORAGE CONDITIONS

SikaForce®-840 L07 has to be kept between 10 °C and 30 °C in a dry place. Do not expose it to direct sunlight or frost. After opening of the packaging, the content has to be protected against humidity.
The lowest allowed temperature during transport is -20 °C for max. 7 days.

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