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wedi sealant 620

wedi sealant 620

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"Glue and apply 100% seal at the same time.“

Product information

wedi sealant 620 is a single-component, ready-to-use, polymer sealant. It is used as a system component for wedi building boards with vapour membrane barrier applied in the factory and across the entire range of wedi sealing membranes.

wedi sealant 620 is water-resistant and reacts to form an elastic adhesive in the presence of humidity. It has excellent weather and chemical resistance. The product is free of solvents, silicon and PCPs and has low shrinkage.

Technical properties

Basic raw material silane-modified-polymer (SMP)
Colour grey
Hardening system through air humidity
Density ca. 1,45 g/ml
Solvent content 0 %
Isocyanate content 0 %
Drying agent content approx. 100 %.
Elongation at break approx. 250 %
Skin formation after approx. 15 minutes
Through-hardening (+23 °C / 50% RH) approx. 3 mm per 24 hours
Permissible total movement approx. 20 %
Processing temperature do not use below +5 °C
Temperature resistance -40 °C to +100 °C
up to 180°C for a short time (max. 30 minutes)
Frost stability not frost-sensitive
   
Consumption  
Approx. 1,5 kg/m² per mm of thickness  
Approx. 70 ml/metre for bonding sealing membranes with a 6 cm overlap  
Approx. 140 ml/metre for bonding sealing tapes with a width of 12 cm  
Approx. 115 ml/metre for bonding sealing tapes with a width of 10 cm  
   
Storage  
Store in a cool, dry place between +10 °C and +35 °C.  
See packaging label for shelf life (approx. 9 months unopened in the original container).  

Product sizes

Order no. Designation Content
US5000088 wedi sealant 620 1 sausage (10.5 oz. (310 ml))
US5000083 wedi sealant 620 1 sausage (20 oz. (600 ml))

Applications of wedi 620 sealant

Applications:
wedi 620 is used for the waterproof adhesion of wedi sealing tapes, sealing corners, sealing gaiters, sealing membranes and wedi building boards with vapour membrane barrier applied in the factory.
In addition, the joint areas of the wedi Subliner Dry and wedi Subliner Flex sealing membranes can be bonded and sealed with wedi 620. For wedi Subliner Dry, the joint connections can be realised as overlaps or with a sealing tape. The joint areas for wedi Subliner Flex are always butt jointed and bonded with wedi sealing tapes and wedi 620.

Surface requirements:
The adhesive surfaces must be solid, load-bearing, dry and free of grease and dust. Any contaminants such as separating agents, preservatives, grease, oil, dust, water, old adhesives/sealants and any other materials that could impair adhesion must be removed.

Installation:
wedi 620 should be applied to the bonding surface with no bubbles and with good coverage (thickness max. 3 mm). For surface bonding, wedi 620 should be thinly spread on the surface with a fine grooved spatula or similar. The sealant is applied to the surface approx. 10 mm beyond the border areas of the sealing tape, moulded part or sealing sheet.

Sealing corners, sealing tapes or moulded parts are inserted into the fresh adhesive layer and pressed on (e.g. with a trowel or pressure roller) so that the sealant is pushed out of the sides. The excess material is smoothly removed with a smoothing trowel.

Folds and distortions should be smoothed out and pressed down. The hardening time can be reduced by moistening slightly with water and high temperatures. Once the wedi 620 has hardened, tiling can begin.

If wedi sealing membranes are applied with an overlap (wedi Subliner Dry), wedi 620 is applied to the overlapping area (min. 5 cm) and spread with a suitable smoothing trowel. The overlapping sealing membrane is then pressed into the adhesive bed (e.g. with a trowel or pressure roller). Material which escapes is smoothly removed with a smoothing trowel.

If wedi sealing membranes are butt jointed (wedi Subliner Dry or wedi Subliner Flex), they are bonded to one another and sealed at the joint with sealing tape. wedi 620 is applied to both sides of the joint area with a suitable smoothing trowel. The sealing tape is then pressed into the adhesive bed (e.g. with a trowel or pressure roller). Material which escapes is smoothly removed with a smoothing trowel.

Sealant which has not hardened can be removed while wet using rubbing alcohol or white spirit. Once hardened, it can only be removed mechanically.

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