Sikaflex®-127
Multipurpose sealant and adhesive based on hybrid polyurethane
Sikaflex®-127 is a single component, elastic, moisture curing, hybrid polyurethane based construction sealant and adhesive. Its good adhesion to most construction materials and good weathering resistance makes it especially suitable for a variety of interior and exterior sealing applications.
- Single component, ready to use
- Good ageing resistance
- Good weathering resistance
- Bonds well to a wide variety of substrates without the need for special pre-treatment
- Easy to apply
- Suitable for gluing gutters, drip trays, flashings, and connection joints
- Moisture cured
- Fast skinning
- Isocyanate and solvent free
- Can be overpainted
- Low odour
Usage
As a sealant for:- Connection joints
- Window and door frames
- Precast concrete elements
- Applications requiring over-painting of sealant
- Interior and exterior use
- All other types of undefined gap filling likely to experience low to medium movement
- Concrete
- Masonry
- Most stones
- Ceramic
- Wood
- Metals
- Glass
- Plastic
- PVC
- Aluminium Composite Panels
Advantages
- Single component, ready to use
- Good ageing resistance
- Good weathering resistance
- Bonds well to a wide variety of substrates without the need for special pre-treatment
- Easy to apply
- Suitable for gluing gutters, drip trays, flashings, and connection joints
- Moisture cured
- Fast skinning
- Isocyanate and solvent free
- Can be overpainted
- Low odour
Packaging
600 ml foil pack, 20 foil packs per box
300 ml cartridge, 12 cartridges per box
Colour
Concrete Grey, White, Black
Product Details
Chemical base
hybrid polyurethane based on silane terminated polymer
Shelf life
12 months from the date of production
Storage conditions
The product must be stored in original, unopened and undamaged sealed packaging in dry conditions at temperatures between +10 °C and +25 °C. Protect from direct sunlight.
Density
~1.65 kg/L
Shore A hardness
~ 35 | (ASTM D 2240: 2015/ISO 868) |
Tensile strength
≥ 1.0 N/mm2 | (ASTM D 412:2016/ISO 37) |
Secant tensile modulus
N/mm2 | ~ 0.6 |
Elastic recovery
≥ 80% | (ISO 7389: 2002) |
Tear propagation resistance
~ 8.0 N/mm | (ASTM D 624: 2000/ISO 34) |
Movement capability
± 12.5 % | (ASTM C719: 2014) |
Chemical resistance
Sikaflex®-127 is resistant to fresh water, seawater, diluted acids and diluted caustic solutions; temporarily resistant to fuels, mineral oils, vegetable and animal fats and oils; not resistant to organic acids, glycolic alcohol, concentrated mineral acids, caustic solutions or solvents.
Service temperature
-50 °C min. / +90 °C max.
Elongation at break
≥ 350 % | (ASTM D 412:2016/ISO 37) |
Application
Sag flow
No flow upto 50°C
Ambient air temperature
+5 °C min. / +40 °C max.
Substrate temperature
+5 °C min. / +40 °C max., min. 3 °C above dew point temperature
Backing material
Use closed or open cell, polyethylene foam backing rod
Curing rate
~2 mm/24 hours (+23 °C / 50 % r.h.) | Corporate Quality Procedure (CQP 049-2) |
Skin time
~40 minutes (+23 °C / 50 % r.h.) | Corporate Quality Procedure (CQP 019-1) |
Tack free time
Upto 16 hrs | (BS 5212-3: 1990) |
Consumption
1650 kg is required for a groove size of 1 cum
EQUIPMENT
Sikaflex®-127 sausages is applied with hand operated closed type cartridge gun and cartridges is applied with open type cartridge gun. Similar pneumatic or battery-operated guns may also be used.
SUBSTRATE QUALITY
- The substrate must be sound, clean, dry and free of all contaminants such as dirt, oil, grease, cement laitance, old sealants and poorly bonded paint coatings which could affect adhesion of the adhesive / sealant.
- The substrate should be of sufficient strength to resist the stresses induced by the sealant during movement.
SUBSTRATE PREPARATION
All substrates
- Removal techniques such as wire brushing, grinding, sanding or other suitable mechanical tools can be used.
- All dust, loose and friable material must be completely removed from all surfaces before application of any activators, primers or adhesive / sealant.
Sikaflex®-127 adheres without primers and/or activators. Primers are adhesion promoters and not an alternative to improve poor preparation / cleaning of joint surfaces. For optimum adhesion, joint durability and critical high-performance applications the following priming and/or pre-treatment procedures shall be followed:
Non-porous substrates
- Aluminium, anodised aluminium, stainless steel, galvanised steel, powder coated metals, glazed tiles, plastic or PVC: slightly roughen surface with a fine abrasive pad. Clean and pre-treat using Sika® Aktivator-205 applied with a clean cloth. Before bonding / sealing, allow a waiting time of > 15 minutes (< 6 hours).
- Other metals, such as copper, brass and titanium-zinc: clean and pre-treat using Sika® Cleaner P or Sika® Aktivator-205 applied with a clean cloth. After a waiting time of > 15 minutes (< 6 hours). Apply Sika® Primer-3 applied by brush. Allow a further waiting time of > 30 minutes (< 8 hours) before bonding / sealing.
Porous substrates
- Concrete, aerated concrete and cement-based renders, mortars and bricks: prime surface using Sika® Primer-3 applied by brush. Before bonding / sealing, allow a waiting time of > 30 minutes (< 8 hours).
For more detailed advice and instructions contact Sika Technical Services.
APPLICATION
IMPORTANT
Sikaflex®-127 can be applied between +5 °C and +40 °C but changes in reactivity and application properties must be considered. The optimum temperature for substrate and sealant is between +15 °C and +25 °C.
Bonding Procedure
- After the necessary substrate preparation, prepare the end of the cartridge before or after inserting into the sealant gun then fit the nozzle.
- Apply in beads, strips or spots at intervals of a few centimetres each. Use hand pressure only to fix the components to be bonded into position before skinning of the adhesive occurs. Incorrectly positioned components can easily be unbonded and repositioned during the first few minutes after application. If necessary, use temporary adhesive tapes, wedges, or supports to hold the assembled components together during the initial curing time.
- Fresh, uncured adhesive remaining on the surface must be removed immediately. Final strength will be reached after complete curing of Sikaflex®-127, i.e. after 24 to 48 hours at +23 °C, depending on the environmental conditions and adhesive layer thickness.
Sealing Procedure
Masking
It is recommended to use masking tape where neat or exact joint lines are required. Remove the tape within the skin time after finishing.
Joint Backing
After the required substrate preparation, insert a suitable backing rod to the required depth wherever necessary.
Priming
Prime the joint surfaces as recommended in substrate preparation. Avoid excessive application of primer to avoid causing puddles at the base of the joint.
Application
Prepare the end of the cartridge before or after inserting into the sealant gun then fit the nozzle. Extrude Sikaflex®-127 into the joint ensuring that it comes into full contact with the sides of the joint and avoiding any air entrapment.
Finishing
As soon as possible after application, sealant must be firmly tooled against the joint sides to ensure adequate adhesion and a smooth finish.
Use a compatible tooling agent (e.g., Sika® Tooling Agent N) to smooth the joint surface. Do not use tooling products containing solvents.
Overpainting
Sikaflex®-127 can be best painted by allowing the sealant to fully cure first. All paints must be tested by carrying preliminary trials under manufacturing conditions. The elasticity of paints is usually lower than that of sealants. This could lead to cracking of the paint in the joint area.
CLEANING OF TOOLS
Clean all tools and application equipment immediately after use with Sika® Remover-208. Once cured, hardened material can only be removed mechanically.
For cleaning skin use Sika® Cleaning Wipes-100.