Körapur® 128 S is an elastic one-component adhesive and sealant used for bonding in the manufacturing of containers, vehicles, vehicle bodywork, air conditioning and heating equipment, metalwork, and other applications. It exhibits good adhesion to primed and painted metals, aluminum and steel, wood, and duroplastics. It also offers good resistance to humidity and weathering.

Chemical Family: Polyurethanes (PU)

Application Method: Sachet Dispenser

Compatible Substrates & Surfaces: Alloy Steel, Aluminum, Aluminum Alloys, Coated Surfaces, Galvanized Steel, Metal, Painted Surfaces, Plastics, Steel, Wood

Features: Cold Resistance, Excellent Elasticity, Excellent Humidity Resistance, Excellent Moisture Resistance, Excellent Substrate Adhesion, Good Adhesion, Good Substrate Wetting, Good Weather Stability, Heat Resistance, High Elongation, High Flowability, Paintable, Self-Leveling, Temperature Resistance, Weather Resistance

Technical Data Sheet
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Enhanced TDS

Identification & Functionality

Features & Benefits

Ready-to-Use Product Features
Product Benefits
  • Good adhesion to primed and painted metals, aluminium and steel, wood and duroplastics
  • Good resistance to humidity and weathering
  • Overpaintable after curing
  • Resistant to temperatures from -40°C to +90°C (up to +120°C for short intervals)
  • Self-levelling
  • Can be used with booster Köracur 110 S

Applications & Uses

Markets
Applications
Application Area
Application Method
Compatible Substrates & Surfaces
Cure Method
Processing Information

Preparation

  • For some substrates the use of mechanical pretreatment and/or cleaner or primer is necessary to achieve good adhesion. Refer to the product properties section of this data sheet for special surface requirements and suitable adhesion promoters.

Processing

  • Refer to the technical data table regarding processing parameters. Low temperatures can cause a temporary increase in viscosity resulting in reduced extrusion and slower curing rates.

Cleaning

  • Clean tools immediately after use. Once cured, the material can only be removed mechanically. Appropriate cleaners are listed in the product properties table.

Properties

Physical Form
Physical Properties
ValueUnitsTest Method / Conditions
Density1.2g/cm³DIN EN ISO 2811-1
Glass Transition Temperature- 54°CDIN EN ISO 6721-1
Cured Properties
ValueUnitsTest Method / Conditions
Change in Volumemax. - 1%DIN EN ISO 10563
Curing to Depth (within first 24 h)3mm/dayDIN 50014
Elongation at Break500%DIN EN ISO 527
Hardness (after 28 d, specimen thickness = 6 mm)40Shore ADIN ISO 7619-1
Service Temperature- 40°C-
Skin Formation Time30minKö-test method 100109
Tear Strength5N/mmDIN ISO 34-1 Type B
Tensile Strength1.5mPaDIN EN ISO 527
Processing Properties
ValueUnitsTest Method / Conditions
Processing Temperature15 - 35°C-
Service Temperature90°C-
Short Term Temperature Resistance (60 min)120°C-
Storage Temperature5 - 25°C-

Technical Details & Test Data

Processing Information
Suitable Substrates

Painted or powder coated surfaces

Various galvanized steels
Various aluminium alloys
Various steel alloys
Duroplastics
Wood
Surface Requirements Dry
Clean
Free of grease
Surface Cleaning Körasolv PU
Körasolv® WL
Adhesion Promoter (absorbing surface) Körabond® HG 74 E
Adhesion Promoter (non absorbing surface) Körabond HG 81
Application Method Pouring
Application Equipment Sachet dispenser
Dispensing system
Product Overpaintability

After skin formation (depending on paint)

 

  • Cleaner for Tools Körasolv® PU
  • Resistance against UV Radiation Not suitable for glass bonding with permanent UV radiation to the bonding area. Please ask your local sales office for products suitable for such applications.
  • Stress Cracking Preliminary tests must be carried out on plastics with a tendency to stress cracking. (PMMA, ABS, PC or PS)
  • Compatibility with Polystyrene Foams Not suitable for bonding polystyrene foams. Please ask your local sales office for products suitable for such applications.
  • Avoid Contact with Isocyanate Reactive Substances Avoid direct contact with isocyanate reactive substances, especially alcohol such as spirit, dilutions, cleaning compounds and reaction or curing products of silane-modified polymers or silicones until the adhesive has attained full cure. This will prevent the adhesive from curing properly.

Packaging & Availability

Storage & Handling

Shelf Life
12 months (cartridges and sachets), 9 months (drums)
Storage Condition
  • Do not store at temperatures above +25°C.
  • Precautions: When processing Körapur 128 S avoid direct contact with the uncured material. Safety gloves are recommended.