PU 2HK-L

PU 2HK-L is a two-component polyurethane adhesive characterized by good flexibility and with self-extinguishing properties

  • Non-abrasive and suitable for use with dosers.
  • Low exothermic level during hardening.
  • Characterized by a low shrinkage after hardening.
  • Good flexibility and adhesion on different substrates.
  • Good electrical properties in conditions of high humidity.
  • The adhesive is capable of operating up to 130 °C.
  • Self-extinguishing properties.
  • Particularly suitable for the encapsulation and coating of electrical and electronic devices.
  • It can be used as an anti-stress coating layer in cases where the units are encapsulated or impregnated in rigid composites.
  • Some of the uses of the PU 2HK-L are as follows:

electronic boards, transformers, connectors, sensors, relays, amplifiers, power supplies, circuit breakers, motors and complete electronic devices.


Attachment

TDS PU 2HK-L

Description

PROPERTIES PART A PART B MIXED PRODUCT
COLOUR Greyish Black Dark Grey
VISCOSITY @ 25 °C 2.500 – 3.500 Cps 90 – 110 Cps 1.200 – 2.200 Cps
DENSITY @ 25 °C 1,27 ± 0,05 g/cm3 1,22 ± 0,05 g/cm3 1,25 ± 0,05 g/cm3
OPEN TIME (5mm – 20°C) _ _ 30 min.
FIXTURE TIME (5mm – 20°C) _ _ 40 – 60 min.
MIXING RATIO BY WEIGHT 100 25 _
MIXING RATIO BY VOLUME 100 26 _
MECHANICAL PROPERTIES
HARDNESS @ 25°C (ASTM D-676) 55 – 65 Shore D
TENSILE STRENGTH(ISO 527) 6/8 MPa
FLEXURE STRENGTH (ISO 178) 12/16 MPa
COMPRESSIVE STRENGTH (ISO 815-1) 18/24 %
ELECTRICAL PROPERTIES
DIELECTRIC STRENGHT   (IEC-60243) 25/30 KV/mm
SURFACE RESISTANCE @ 25°C (ASTM D 257) 1014 Ω
VOLUME RESISTIVITY @ 25°C (ASTM D 257) 1014 Ω/cm
DISSIPATION FACTOR – 50 HZ (ASTM D-150) 25°C – 0,025 / 0,035

70°C – 0,06 / 0,08
RELATIVE PERMITTIVITY – 50 HZ (ASTM D-150) 25°C – 3 / 4

70°C – 7 / 8
THERMAL AND CHEMICAL PROPERTIES
THERMAL CONDUCTIVITY (ISO 8894-1) 0,28 – 0,32 W/mK
LINEAR THERMAL EXPANSION (ASTM D3387) 140 – 160 °C -1 x 10-6
WATER ABSORPTION – 10 DAYS @ 25°C(ASTM D570) 0,8 – 0,9 %
BOILING WATER ABSORPTION – 1 DAY @ 100°C(ASTM D570) 0,9 – 1 %
THERMAL CLASS(IEC 60085) B

Additional information

Specific work-setting (component)

Operating Temperature > 90 ° C, Operating Temperature <0 ° C, STATIC bonding-line <100 cm (LIGHT HANDLING)
Type of joint (application mode)

≈ 100% of SURFACE
Adhesive Working Time

30 ÷ 90 MINUTES
Adhesive Fixture Time

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

CARBON FIBER-REINFORCED COMPOSITES # CARBON FIBER-REINFORCED COMPOSITES, CARBON FIBER-REINFORCED COMPOSITES # GLASS REINFORCED FIBER COMPOSITES, GLASS REINFORCED FIBER COMPOSITES # GLASS REINFORCED FIBER COMPOSITES, HIGH ENERGY SURFACE THERMO-PLASTIC POLYMERS # CARBON FIBER-REINFORCED COMPOSITES, HIGH ENERGY SURFACE THERMO-PLASTIC POLYMERS # GLASS REINFORCED FIBER COMPOSITES, HIGH ENERGY SURFACE THERMO-PLASTIC POLYMERS # HIGH ENERGY SURFACE THERMO-PLASTIC POLYMERS, METALS and / or ALLOYS (Al – Ti – Ni – Cr – Fe) # METALS and / or ALLOYS (Al – Ti – Ni – Cr – Fe), METALS and / or ALLOYS (Cu / Zn – Fe – Pb) # METALS and / or ALLOYS (Al – Ti – Ni – Cr – Fe), METALS and / or ALLOYS (Cu / Zn – Fe – Pb) # METALS and / or ALLOYS (Cu / Zn – Fe – Pb)
component sector/process

AUTOMOTIVE – TRUCK – BUS – AGRICULTURAL, FORESTRY MACHINES, INDUSTRIAL COMPONENTS
Type of failure mode (after joint stress)

ADHESIVE (bonding failure between adhesive and adhering: no residue on substrates), COHESIVE (bonding failure inside the adhesive: residue presence on substrates)

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