Körapur® 645

Identification

Chemical Family

Polyurethanes (PU)

GBU

EA

RTU Product Type

2K (2 component) Adhesive,

Reactive Adhesive,

Structural Adhesive

Categories

Markets → Building & Construction → Applications → Building Envelope & Roofing → Shingles & Tiles

Technologies → Adhesives & Sealants → Product Families → Bonding Technology → 2K Liquid Reactive Adhesives

Applications

Application Area

Tile,

Cladding

Application Method

Roller,

Spray,

Spatula

Compatible Substrates & Surfaces

Ceramic,

Fiberglass,

Polyvinyl Chloride (PVC),

Polyurethane,

Expanded Polystyrene (EPS),

Aluminum Alloys,

Carbon Fiber Reinforced Plastics (CFRP),

Glass Fiber,

Alloy Steel,

Glass Fibre Reinforced Polymer (GFRP)

Applications & Uses

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.

 

Typical Application

Bonding of safety mesh on the back of thin big tiles to avoid easy breaking

Features

Ready-to-Use Product Features

Excellent Humidity Resistance,

Fast Setting,

Good Flexibility,

Pourable,

Temperature Resistance,

Weather Resistance

Features & Benefits

Labeling Claims

Plasticizer-free,

Solvent-free,

Sustainable

Technical Advantages

• Product versions available in different opening and curing times
• Adhesive reactivity adjustable
• Low coating weight possible
• Calorific potential that allows passing Euroclass A2, s1, d0 for the standard coating weight
• No residual tack that prevents tiles’ blocking
• Broad adhesion spectrum
• Good resistance to humidity, weathering and temperatures
• Pourable

Packaging & Availability

Regional Availability

• Europe

Properties

Processing Properties

	Value	Units	Test Method / Conditions
Mixing Ratio (Part A : Part B)	2.5:1	v%	-
Mixing Ratio (Part A : Part B)	3 : 1	wt %	-
Processing Temperature	15 - 25	°C	-
Service Temperature	- 160 to 90	°C	-
Short Term Temperature Resistance (60 min)	120	°C	-
Viscosity	2300	mPa·s	Kö-test method 100003

Component A

	Value	Units	Test Method / Conditions
Density	1.49	g/cm³	DIN EN 542
Storage Temperature	10 - 25	°C	-
Viscosity	6000	mPa·s	Kö-test method 100000

Component B

	Value	Units	Test Method / Conditions
Density	1.23	g/cm³	DIN EN 542
Isocyanate Content	31	%	-
Storage Temperature	10 - 25	°C	-
Viscosity	300	mPa·s	Internal Standard HBF00869

Cured Properties

	Value	Units	Test Method / Conditions
Hardness	75	Shore D	DIN EN ISO 868
Lap Shear Strength (substrates: aluminium/aluminium)	15	mPa	DIN EN 1465
Pot Life	13	min	-
Tensile Strength	19	mPa	DIN 53504

Physical Properties

	Value	Units	Test Method / Conditions
Density	1.38	g/cm³	DIN EN 542
Glass Transition Temperature	56	°C	DIN EN ISO 6721-1
Gross Heat of Combustion	17.1	MJ/kg	DIN EN ISO 1716

Storage & Handling

Storage Information

Körapur® 645 should be used within the shelf life specified on the packaging. The storage stability applies to material stored under appropriate conditions only (original unopened containers, recommended storage temperature).

Technical Details & Test Data

Processing Information

Suitable Substrates	Expanded polystyrene (EPS)
	Ceramic tiles
	Fiberglass mesh
	Various aluminium alloys
	Various steel alloys
	Polyurethane (PUR)
	Polyvinyl chloride (PVC)
	Various other substrates
	Various composite materials (e.g. CFRP, GFRP)
Consistency	Pourable
	Low viscosity
Surface Requirements	Dry
	Clean
	Free of grease
	Free of dust
Application Method	Potting
	With spatula
	With paint roller
	Spraying
Application Equipment	Two part mixing and metering system With machine
Product is free of	Solvents
	Plasticizers

 

• Cleaner for Tools Körasolv® PU
• Moisture Sensitivity The adhesive must not be exposed to moisture before and during application. Moisture causes foaming leading to lower mechanical properties.
• Preparation The resin (part A) settles over time and needs to be stirred up and homogenized before use.

Test Data

Körapur® 645 passes the following tests:

• Water jet cutting
• 24 hours boiling water
• Ball drop
• Various bonding tests