KÖRATAC DF 842 1 l, PVC cold-welding agent for bonding plasticized PVC, for roof foils and tank sealing foils, colourless, low viscosity, curing time approx. 24 h

KÖRATAC DF 842 1 l is a PVC cold-welding agent for cold-welding or bonding of plasticized PVC, intended for applications such as roof foils and tank sealing foils. The product works through PVC dissolving and swelling characteristics to help create a tight, durable bond. It is a colourless, low-viscosity liquid suitable for brush application or spraying.

Advantages and unique features

• For cold-welding or bonding of plasticized PVC (roof foils, tank sealing foils, etc.).
• Dissolving and swelling characteristics support joint tightness.
• Low viscosity – easy, even application by brush or spraying equipment.
• Option to achieve higher initial tack (apply on both sides and allow a short flash-off).
• No standard airing time needed – a small bead at the overlap helps verify correct application.

Properties and applications

• Use: cold-welding or bonding of plasticized PVC (e.g., roof foils and sealing foils for tanks).
• Action: PVC dissolving and swelling characteristics.
• Preparation: due to many PVC types (especially plasticized PVC), preliminary tests are recommended to check swelling and dissolving behaviour.
• Cleaning of contaminated foils: clean with KÖRASOLV GL.
• Standard bonding: apply KÖRATAC DF 842 abundantly on one side using a soft brush or spraying equipment, then press both parts together immediately without airing so that a small bead is formed at the overlap end.
• If surfaces have dried too much: the application procedure may be repeated.
• High initial tack: apply on both sides and let dry for 1–3 minutes before pressing.
• Appearance note: may produce a yellow cast on white or very bright foils, without negative effect on the foil or the bond.

Technical parameters

Storage recommendations

Do not store below +5°C or above +25°C. In unopened original containers, shelf life is at least 12 months. Close the container tightly after use.

FAQ

1) What is KÖRATAC DF 842 used for?
It is used for cold-welding or bonding of plasticized PVC, e.g., roof foils and tank sealing foils.

2) Do I need an airing time before joining the foils?
In the standard procedure, press parts together immediately without airing. For higher initial tack, apply on both sides and let dry for 1–3 minutes before pressing.

3) What if the surfaces dry too much?
If the surfaces have dried too much, repeat the application procedure.

4) Can it discolor white foils?
It may cause a yellow cast on white or very bright foils, but without negative effect on the foil or the bond.