Go
Show all documents

SikaForce®-436 L25

(formerly ADEKIT A 236-25)

Adhesive for large composite parts

SikaForce®-436 L25 is a structural 2-component polyurethane adhesive, which cures at room temperature. It is designed for bonding large composite or coated metal components. While uncured, it has very good non-sag and compressibility behavior, combined with an easy smoothing.  

  • Good non-sag behavior and tooling
  • Gap-filling up to 30 mm in vertical applications and up to 60 mm in horizontal applications
  • Combing long open time with reduced handling time
  • Odor- and solvent-free
  • Usable with dispensing machines equiped with pressure vessels
 
Contact
Go
Show all documents

PRODUCT BENEFITS

  • Good non-sag behavior and tooling
  • Gap-filling up to 30 mm in vertical applications and up to 60 mm in horizontal applications
  • Combing long open time with reduced handling time
  • Odor- and solvent-free
  • Usable with dispensing machines equiped with pressure vessels
 

Areas of Application

SikaForce®-436 L25 is suitable for structural elastic bonding of composites (e.g., CFRP, GFRP) or coated metals in marine, 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®-436 L25 (A)

SikaForce®-436 (B)

Chemical base

Polyol

Isocyanate

Color (CQP001-1)

  

mixed

Grey

Beige

Grey

Density (uncured)

  

mixed (calculated)

1.30 g/cm3

1.40 g/cm3

1.35 g/cm3

Mixing ratio

by volume

by weight

100 : 100

92 : 100

Viscosity

at 15 s-1

210 Pa·s A

55 Pa·s A

Application temperature

ambient

15 ─ 35 °C

Open time (CQP046-11 / ISO 4587)

25 minutes B, C

Handling time (CQP046-11 / ISO 4587)

210 minutes B, C

Shore D hardness (CQP023-1 / ISO 868)

55

Tensile strength (CQP036-1 / ISO 527)

13 MPa B, D

Elongation at break (CQP036-1 / ISO 527)

45 % B, D

E-Modulus (CQP036-1 / ISO 527)

elongation 0.5 – 1 %

180 MPa B, D

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

13 MPa B, C, D

Shelf life

9 months E

CQP = Corporate Quality Procedure

A) tested at 25 °C

B) 23 °C / 50 % r. h.

C) adhesive layer: 25 x 12.5 x 1 mmD) cured for 1 week at 23 °CE) stored between 15 and 25°C
Technical Information

CURE MECHANISM

The curing of SikaForce®-436 L25 takes place by chemical reaction of the two components. Higher temperatures (max. 100 °C) speed up and lower temperatures slow down the curing process. High humidity reduces the open time as well.

CHEMICAL RESISTANCE

The chemical resistance is influenced by several factors such as chemical composition, concentration, period of exposure and temperature. Therefore a project related testing in case of chemical or thermal exposure is required.

Application

Application Information

Surface preparation

Surfaces must be clean, dry and free from grease, oil and dust.
Based on the surface and type of material, a physical or chemical pre-treatment might be required. Type of pre-treatment must be determined by preliminary tests.

Application

SikaForce®-436 L25 is processed by 2-component equipment or by dual cartridges with pneumatic or electric driven piston guns. For cartridges use the mixer as stated, with equipment the mixer needs to be defined by tests.

Prior to application, check both components for crystallization. Never use components if crystalization has occured.

Cartridge: Extrude adhesive without mixer to equalize the filling levels. Attach the mixer and dispose of a bead of at least the length of the mixer prior to the application.

Adhesion as well as curing speed can be improved by heat.
For automated applications a suitable filter system has to be used.
For support on selecting and setting up a suitable pump system, contact the System Engineering department of Sika Industry.

 

Removal

SikaForce®-436 L25 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.

Application limits

The maximum service temperature is 120 °C, the minimum service temperature is -40 °C.

STORAGE CONDITIONS

All components of SikaForce®-436 L25 have to be stored at temperature between 15 °C and 25 °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.
For transportation purposes, the storage temperature can be exceeded. For a max. period of 2 weeks temperatures between 0 °C and 40 °C are allowed. Never use crystalized or inhomogeneous components.

Documents