Product Data Sheet Safety Data Sheet Show all documents
Sika® Hybriflex® 25LM

Sika® Hybriflex® 25LM

An advanced hybrid polymer building sealant

Sika® Hybriflex® 25LM is a one part, low modulus, chemically curing sealant combining the best qualities of silicone and polyurethane technologies. It is specifically designed for adhering most common building surfaces and to create seals between them.

  • High bonding strength.
  • Interior and exterior use.
  • Can be applied to damp surfaces.
  • Waterproof & weatherproof.
  • Quick curing.
  • Overpaintable if required (testing advised).
  • Permanently flexible.
  • Resistant to chemicals & petrol (10 % dilute acids/alkalis, most solvents).
  • Excellent primerless adhesion to most surfaces, including metals, most plastics, glass, concrete, plaster, plasterboard, polyester, perspex, glass, wood, enamel, painted surfaces etc.
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Product Data Sheet Safety Data Sheet Show all documents

Usage

  • External and internal perimeter pointing around doors and windows.
  • Weatherproofing for most external applications.
  • Parapet & roofline sealing.
  • Contraction and dilation joints where stress does not occur until fully cured.
  • Sealing vertical expansion joints in brick, stone and concrete.
  • Jointing cladding panels.
  • Bonding difficult materials such as most plastics, metals and fiberglass.
  • Any application requiring high performance, durable sealing and bonding of joints.
  • Applications where resistance to chemical spillage is required.
 

Advantages

  • High bonding strength.
  • Interior and exterior use.
  • Can be applied to damp surfaces.
  • Waterproof & weatherproof.
  • Quick curing.
  • Overpaintable if required (testing advised).
  • Permanently flexible.
  • Resistant to chemicals & petrol (10 % dilute acids/alkalis, most solvents).
  • Excellent primerless adhesion to most surfaces, including metals, most plastics, glass, concrete, plaster, plasterboard, polyester, perspex, glass, wood, enamel, painted surfaces etc.

Packaging

380 ml Cartridge

Colour

White

Product Details

Sustainability / Certifications / Approvals

APPROVALS / STANDARDS

Meets the requirements of ISO 11600 F25LM.
UKCA and CE Marked to EN 15651-1 class F25LM.
Product Information

Chemical Base

STP

Shelf Life

12 months from date of manufacture

Storage Conditions

Store in cool dry conditions between +5 °C and +25 °C

Density

1.40 - 1.50 g/cm3

 
Technical Information

Shore A Hardness

20-30 (ISO 868 - 15 seconds)

Secant Tensile Modulus

~ 0.25 N/mm² (ISO 8339)

Elongation

>400 % (ISO 8339)

Elastic Recovery

>70 % (ISO 7389)

Movement Capability

25 % movement accommodation (ISO 9047)

UV Exposure

Good

Service Temperature

-40 to +100 °C

Joint Design

Joint Dimensions - For maximum movement accommodation, it is recommended that:
The sealant joint depth should be no less than 5 mm.
Joint depth should be 5 mm for joints up to 10 mm wide.
Joints above 10 mm in width should be half the width in depth up to 20 mm and minimum 10 mm for wider joints.
Joint depth may be adjusted to the correct size using a Backer Rod or Bond Breaking Tape in cases where there is not enough depth to use Backer Rod.
Joint Width Calculation - Joint widths are calculated as in BS6213:
Width = (M x 100)  + M
                      F
Where M = movement and F = movement accommodation factor.

Application

Application Information

Ambient Air Temperature

+5 to +35 °C

Substrate Temperature

+5 to +35 °C

Curing Time

0-2 mm / 24 hour at 23 °C and 50 % RH

Skin Time

20 - 45 minutes at 23 °C and 50 % RH
Consumption

Consumption

Joint Size (mm)

Litre per metre run

Metres per 380 ml Cartridge

5 x 5

0.025

15.20

5 x 10

0.050

7.60

10 x 10

0.100

3.80

15 x 10

0.150

2.53

20 x 10

0.200

1.98
Application steps

APPLICATION INSTRUCTIONS

Sealant application should be conducted in line with practices laid down in BS8000-16.

All surfaces must be clean, dry and dust free. All loose or flaking surface coatings, and old sealant and mastic joints, should be removed before application.

Glass, metal and aluminium should be cleaned with a proprietary solvent cleaner prior to application for optimum adhesion. When using solvents, always ensure adequate ventilation. Avoid heat, sparks and open flames. Observe and follow all precautions listed on the solvent container label.
It is not recommended for application to surfaces that are below +5  ̊C as it is impossible to guarantee a dry, frost-free surface at these temperatures.
It is unlikely that priming will be required. However, concrete must be sealed using a Sika® Primer 3N. If primer is desired on non-porous substrates use Sika® Aktivator-205.

  • All surfaces to be sealed must be sound and clean.
  • Cut the tip of the cartridge, fix nozzle and apply using sealant gun.
  • To ensure a proper bond, always smooth down sealant using a spatula or piece of wood wetted with soap and water solution.
  • Tool down within 15 minutes of application.

If in doubt consult Sika® Technical Services.

 

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