MK 20 – 70

MK 20 - 70
MK 20 - 70

Two-component methacrylate adhesive suitable for bonding fibre-reinforced composites in carbon and glass. Specific product for large bonding naval and wind structures.

MK 20-70

  • Methyl-methacrylate → best balance between Tenacity and Torsion | mix ratio 10:1 by volume
  • Doesn’t involve contaminating surface abrasion actions → generally only blowing is required on the hull
  • Allows bonding with all thicknesses that occur → does not exceed in exothermic creating CO2 into the joint
  • Very high thixotropy for vertical and filler applications
  • Large functional gap-fill ≈ 0,50 mm ÷ 50 mm
  • Very long workability time (open-time) → ≈ 90 ÷ 110 minutes
  • Flexible → maximum elongation strength ≈ > 100%
  • High tensile strength → 14 ÷ 18 MPa.
  • Easy pre-dispensed extrusion → through 490 ML bi-cartridges | 19 LT Kgs | 189 LT
  • High resistance to severe wet-static aging cycles → Temperature | Humidity | Salinity
  • It can be mixed manually and not only through the dispensers → a dedicated guided procedure is available
  • Styrene-free formulation (not hazardous for humans)
  • Adjustable open and fix time, in function of the mix ratio

 


Attachment

TDS MK 20-70
Bi-cartridge usage

Description

TYPICAL ADHESIVE CHARACTERISTICS @ 23°C (75°F)

Characteristics
Part A
(Adhesive)
Part B
(Activator)
Mix
(Part A + B)
Colour Off White Grey Grey
Mix ratio by volume 10 (variable) 1 –
Mix ratio by weight 8.4 1 –
Density, g/cc 1.02 ± 0.02 1.03 ± 0.02 ≈ 1,00

 

Tensile Strength MPa 14 – 18 Lap Shear Strength MPa

(AL – AL)

 11,00
Maximum Tensile Elongation          (ISO 527-1) 80 – 100 % Service Temperatures °C -45 / +95
Tensile Modulus MPa 800 – 1100 Lap Shear Strength MPa

(GFRP – GFRP)

 7,5

 

System  Cartridge System Bulk Adhesive | Activator Working Time (minutes) Fixture Time (minutes)
MK 20–70 MK 20–70 A | MK 20–70 B 90 – 110 150 – 180

Additional information

Specific work-setting (component)

DYNAMIC bonding-line > 100 cm (IMPACTS + VIBRATIONS + TORSIONS), Operating Temperature <0 ° C, STATIC bonding-line <100 cm (LIGHT HANDLING)
Type of joint (application mode)

≈ 100% of SURFACE, BEAD – OVERLAP
Adhesive Working Time

10 ÷ 30 MINUTES, 30 ÷ 90 MINUTES
Adhesive Fixture Time

> 90 MINUTES, 30 ÷ 90 MINUTES
Substrates (suitable adherings match))

ARAMIDE FIBER-REINFORCED COMPOSITES # METALS and/or ALLOYS (Al – Ti – Ni – Cr – Fe), CARBON FIBER-REINFORCED COMPOSITES # CARBON FIBER-REINFORCED COMPOSITES, CARBON FIBER-REINFORCED COMPOSITES # GLASS REINFORCED FIBER COMPOSITES, CARBON FIBER-REINFORCED COMPOSITES # METALS and/or ALLOYS (Al – Ti – Ni – Cr – Fe), CARBON FIBER-REINFORCED COMPOSITES # METALS and/or ALLOYS (Cu / Zn – Fe – Pb), GLASS REINFORCED FIBER COMPOSITES # GLASS REINFORCED FIBER COMPOSITES, GLASS REINFORCED FIBER COMPOSITES # METALS and/or ALLOYS (Al – Ti – Ni – Cr – Fe)
Type of failure mode (after joint stress)

COHESIVE (bonding failure inside the adhesive: residue presence on substrates), SUBSTRATE ((adhering structure failure: adhesive causes a fracture on substrate)
component sector/process

NAUTICAL & NAVAL, WIND ENERGY

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