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Clear Sealant and Adhesive:  

         

Sikaflex Crystal Clear - completely transparent multipurpose adhesive and sealant     

Product Description

Sikaflex Crystal Clear is a 1-component, solvent-free, multipurpose adhesive and sealant with a crystal clear appearance.     

Uses

Sikaflex Crystal Clear is designed as a multipurpose adhesive and is suitable for most surfaces including metal, glass, concrete, plaster, plasterboard, wood surfaces, painted enamel, polyester and plastics. Sikaflex Crystal Clear is designed as a sealant for vertical and horizontal indoor connection joints between partition walls, for metal and wood constructions.     

Characteristics / Advantages 

  • 100% crystal clear / transparent
  • Good workability
  • Low shrinkage during cure
  • Especially for home improvement sector
  • Flexible and elastic
  • Can be used on damp concrete
  • Very good adhesion on many typical building materials  

Approvals/Standards:     EN 15651-1 F EXT-INT CC ISO 11600 F 20 LM     

Technical Data      

  • Appearance / Colours: Transparent
  • Packaging: 300 g cartridge (290 ml), 12 cartridges per box
  • Storage Conditions / Shelf-Life: Sikaflex Crystal Clear has a shelf life of 12 months from the date of production, if it is stored properly in undamaged, original, sealed packaging, and if the storage conditions are met.
  • Chemical Base: Silane terminated polymer
  • Density: 1.05 kg/l approx.
  • Tensile Strength: 2.0 N/mm2 approx.
  • Shore A Hardness: 30 approx. (after 28 days)
  • Elongation at Break: 400% approx.
  • Elastic Recovery: 70% approx.
  • Tear Propagation Resistance: 4.0 N/mm approx.
  • Service Temperature: -40oC to +70oC 

Consumption / Joint Design:

In spots:

1 cartridge for 100 x 3 cm spots (diameter = 3 cm; thickness = 0.4 cm) In stripes:

Using a nozzle with 5 mm diameter, bead yields approx. 15 m length per 290 ml cartridge (20 ml approx. per linear meter) The joint width must be designed to suit the joint movement required and the movement capability of the sealant. The joint width shall be >/=6 mm and    10 mm in width are for crack control and therefore non-movement joints. What is relevant, is the joint width at the time of application of the sealant (guide value of +10oC). For larger joints please contact our Technical Service Department  

Backing Material: Use open or closed cell foam backing rods.

Sag Flow: 0 mm (20 mm profile, 23oC) 

  • Ambient Air Temperature +5oC to +40oC, min. 3oC above dew point temperature
  • Relative Air Humidity 30% to 90%
  • Substrate Temperature +5oC to +40oC
  • Curing Rate 3 mm/24 hours approx. (23oC / 50% r.h.)
  • Skin Time 30 minutes approx. (23oC / 50% r.h.)  

Substrate Preparation / Priming

For the application of Sikaflex Crystal Clear all standard construction guidelines apply.     

SUBSTRATE PREPARATION The substrate must be clean, dry, sound and homogeneous, free from oils, grease, dust and loose or friable particles. Sikaflex Crystal Clear adheres without primers and/or activators. However, for optimum adhesion and critical, high performance applications, such as on multi-story buildings, highly stressed joints, extreme weather exposure or water immersion, the following priming and/or pretreatment procedures shall be followed:     

Non-porous substrates Aluminium, anodised aluminium, stainless steel, PVC, galvanised steel, powder coated metals or glazed tiles have to be cleaned and pre-treated using Sika Aktivator-205, wiped on with a clean towel. Before sealing, allow a flash-off time of > 15 minutes (< 6 hours). Other metals, such as copper, brass and titanium-zinc, also have to be cleaned and pre-treated using Sika Aktivator-205,wiped on with a clean towel. After the necessary flash-off time, use a brush to apply Sika Primer-3 N and allow a further flash-off time of > 30 minutes (< 8 hours) before sealing the joints.     

Porous substrates Concrete, aerated concrete and cement based renders, mortars and bricks shall be primed using Sika Primer-3 N applied with a brush. Before sealing, allow a flash-off time of > 30 minutes (< 8 hours).For more detailed advice and instructions please contact the local Sika Technical Services Department. Note: Primers are adhesion promoters. They are neither a substitute for the correct cleaning of a surface, nor do they improve the strength of the surface significantly.     

Application Method / Tools

Sikaflex Crystal Clear is supplied ready to use.

Bonding

After substrate preparation, apply Sikaflex Crystal Clear in beads, strips or spots to the bonding surface in intervals of a few centimetres each. Use hand pressure only to set the element to be bonded into position. If necessary, use SikaTack Panel Tape during the initial hours of curing. An incorrectly positioned element can easily be unfastened and repositioned during the first few minutes after application. Apply pressure again. Optimum bonding will be obtained after the complete curing of Sikaflex Crystal Clear. The recommended adhesive layer thickness (depending on surface evenness) is     3 mm. Fresh, uncured adhesive remaining on the surface must be removed immediately. Final strength will be obtained after complete curing of Sikaflex Crystal Clear.

Sealing

After the necessary substrate preparation, insert a suitable backing rod to the required depth and apply any primer if necessary. Insert a cartridge into the sealant gun and extrude Sikaflex Crystal Clear into the joint making sure that it comes into full contact with the sides of the joint and avoids any air entrapment. Sikaflex Crystal Clear sealant must be firmly tooled against the joint sides to ensure adequate adhesion. It is recommended to use masking tape where exact joint lines or neat lines are required. Remove the tape within the skin time. Do not use tooling products containing solvents.     

Cleaning of Tools

Clean all tools and application equipment immediately after use with Sika Remover-208 and/or Sika Wonder Wipes. Once cured, residual material can only be removed mechanically.     

Further Documents available

Pre-treatment Chart Sealing & Bonding

Safety Data Sheet (SDS)     

Notes on Application / Limitations

Before bonding, check adhesion and resistance of paints and coatings by carrying out a trail.

Colour variations may occur due to exposure to chemicals, high temperatures and/or UV-radiation. However, a change in colour is purely of aesthetic nature and does not adversely influence the technical performance or durability of the product.

Before using Sikaflex Crystal Clear on natural stone, please refer to Sika Technical Services for advice. 

  • Do not use Sikaflex Crystal Clear on bituminous substrates, natural rubber, EPDM rubber or on any building materials which might bleed oils, plasticizers or solvents that could attack the sealant.
  • Do not use Sikaflex Crystal Clear to seal joints in and around swimming pools.
  • Do not use Sikaflex Crystal Clear for joints under water pressure or for permanent water immersion.
  • Do not use outside on easily corroding substrates such as mild steel or iron.
  • Do not use for glass bonding if the bond line or the adhesive and/or substrate interface are directly exposed to sunlight.
  • Do not expose uncured Sikaflex Crystal Clear to alcohol containing products as this may interfere with the curing reaction. 

 

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