Product Data Sheet Safety Data Sheet Show all documents

Sikaflex® MS

High performance multi-purpose modified silicone sealant

Sikaflex® MS is a tough, durable elastomeric joint sealant suitable for use in a wide range of external and internal building applications. It is based upon SMP technology resulting in a unique combination of properties ideally suited to New Zealand climatic conditions. Sikaflex® MS has excellent primerless adhesion to a wide range of common building substrates as indicated below and does not stain concrete, marble and other masonry surfaces.

  • Good primerless* adhesion to most common building materials
  • Paintable any time after curing, with water-based paints (compatibility testing recommended prior to full application)
  • Will not stain masonry, marble or other surfaces
  • Very durable - BRANZ appraised
  • Neutral cure
  • Highly flexible
  • Low odour
* Refer to Priming section.
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Product Data Sheet Safety Data Sheet Show all documents

Usage

Sikaflex® MS has been formulated for sealing joints in and around concrete, brick, masonry, pre-cast panels, stone cladding, windows, doors and fibre cement sheeting. Sikaflex® MS bonds well to:
  • Concrete and masonry
  • Cement plaster systems
  • Aluminium, copper, brass and zinc
  • Stainless, mild or galvanised steel
  • Glass and ceramic tiles
  • Glass reinforced plastics
  • Fibre reinforced cement sheetings
  • Timber, particleboard, hardboard and plywood (refer to Limitations section)
  • Butylclad rubber products - chase sealing
 

Advantages

  • Good primerless* adhesion to most common building materials
  • Paintable any time after curing, with water-based paints (compatibility testing recommended prior to full application)
  • Will not stain masonry, marble or other surfaces
  • Very durable - BRANZ appraised
  • Neutral cure
  • Highly flexible
  • Low odour
* Refer to Priming section.

Packaging

300 ml cartridges / 12 per carton

600 ml sausage unipacs / 20 per carton

Colour

300 ml cartridges

Grey, White, Black, Bronze, Ivory and Titania

600 ml sausage unipacs

Grey, White

Product Details

Sustainability / Certifications / Approvals

APPROVALS / STANDARDS

BRANZ Appraised, Appraisal No.311 [2019]
Product Information

Chemical Base

Moisture curing SMP

Shelf Life

Twelve (12)  months from date of manufacture if stored correctly as stated.

Storage Conditions

Store in original, unopened packaging in cool, dry conditions protected from direct sunlight and at temperatues between +5°C and +25°C.

Density

~ 1.40 kg/l

(ISO 1183-1)
Technical Information

Shore A Hardness

~ 20 (after 28 days)

(ISO 868)

Movement Capability

± 25 %

(ISO 9047)

Chemical Resistance

Good to dilute acids and alkalis

Resistance to Weathering

Excellent UV resistance

Service Temperature

-40°C to +90°C

Joint Design

Sikaflex® MS may be applied to joints between 10 and 35 mm wide. To minimise stresses imposed on the joint sealant, all moving joints should be designed to an optimum width to depth ratio of 2:1. This ratio is subject to these overriding minimum sealant depths:

  • 5 mm minimum sealant depth at any point.
  • 5 mm minimum bonding depth against metals, glass and other non-porous surfaces, providing that joint faces are in good condition.
  • 8 mm minimum bonding depth against masonry or other porous surfaces, or any non-porous surfaces where joint faces are in poor condition.
  • Shear joints shall be a minimum joint width to depth ratio of 1:2 up to a maximum of 1:1.

Application

Application Information

Curing Rate

~3 mm/24 hours (23°C / 50% r.h.)

(CQP 049-2)
Application steps

SUBSTRATE PREPARATION

Joint surfaces must be clean and free from frost and surface water. Remove all dirt, Iaitance, loose materials and foreign matter.

  • Remove alI rust, scale and protective lacquers from metal surfaces.
  • Non-porous surfaces should be degreased using Sika Thinner C
  • In all joints a bond breaker must be used to prevent sealant contact with the back of the joint, and hence allow optimum performance. In shallow joints self adhesive polyethylene tape can be used. Deep joints should incorporate a backing strip such as Sika PEF Rod to support the sealant while also acting as a bond breaker.
 

PRIMING

Good adhesion can be gained on concrete, timber, metals, ceramics, brick work and most coating surfaces without the use of primers. However, on some surfaces adhesion may be improved by the use of a primer - refer to Sika for advice.

CLEANING OF TOOLS

Clean tools immediately after use with Sika Thinner C.

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