Körapur® 840 is a semi-structural, two-part system of polyurethane adhesive and sealant that utilizes polycondensation curing. It is beige colored and has high impact strength and no significant shrinkage during curing. Additionally, this product offers a wide range of pot life profiles.

Product Type2K (2 component) Adhesive, Reactive Adhesive

Application AreaBus, Truck

Compatible Substrates & SurfacesAluminum Alloys, Composites, Metal, Painted Surfaces, Steel, Wood

Chemical FamilyPolyurethanes (PU)

FeaturesGood Adhesion, Good Impact Strength, Good Sagging Resistance, Impact Resistance, Long Potlife

Technical Data Sheet

Enhanced TDS

Identification & Functionality

Chemical Family

Features & Benefits

Applications & Uses

Application Area
Cure Method
Processing

Processing

Consistency

Non-sagging
Pasty

Surface requirements

Dry
Clean
free of grease
free of dust

Product is free of

solvents
plasticizers
Cleaning Cleaner for tools Körasolv PU
Hints Moisture Sensitivity

The adhesive must not be exposed to moisture before and during application.
Moisture causes foaming leading to lower mechanical properties.

  • For some substrates the use of mechanical pretreatment and/or cleaner or primer is necessary to achieve good adhesion.
  • Low temperatures can cause a temporary increase in viscosity resulting in reduced extrusion and slower curing rates.
  • Clean tools immediately after use. Once cured, the material can only be removed mechanically.

Properties

Physical Form
Physical Properties
ValueUnitsTest Method / Conditions
Density1.5g/cm³DIN EN 542
Glass Transition Temperature30.0°CDIN EN ISO 6721-1
Cured Properties
ValueUnitsTest Method / Conditions
Hardness65.0ISO 868/DIN ISO 7619-1, Shore D
Tensile Strength12.0MPaDIN EN ISO 527
Elongation at Break30.0%DIN EN ISO 527
G10-Modulus80.0MPaDIN EN 14869-2
Lap Shear Strength (substrates: aluminum/aluminum)18.0MPaDIN EN 14869-2
Pot Life2 - 45min
Processing Parameters
ValueUnitsTest Method / Conditions
Mixing Ratio (Part A:Part B, by weight)5.0:1
Processing Temperature15 - 25°C
Viscosity45000.0mPa.sKö-test method 100003
Recommended Operating Conditions
ValueUnitsTest Method / Conditions
Service Temperature- 160 - 90°C
Short-Term Temperature Resistance120.0°C

Packaging & Availability

Regional Availability
  • Africa
  • Asia Pacific (Excluding Russia)
  • Australia
  • Canada
  • China
  • Europe (Excluding Russia)
  • India
  • Japan
  • Korea
  • Latin America
  • Malaysia
  • Middle East
  • North America
  • Philippines
  • USA