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Glossary

                            Hygienic Cladding Adhesives

In association with...

There are number of adhesives suitable for the application of LamproSystem® Hygienic GRP Cladding and this information explains the differences in the products used for full bond application.

TradePUR EM400

 

The most common system, known usually as ‘Trowel on,’ is a Twin Pack Polyurethane adhesive in the name of TradePUR EM400. The formulation has been designed to give ease of mixing for notched trowel applications. This filled adhesive has been formulated for the bonding of the LamproSystemTM Hygienic GRP Cladding as supplied by Kemlite to many building substrates including new and existing block work, brickwork, concrete, plaster, plasterboard, ceramic tiles, plywood and other timber based surfaces. The material has thixotropic properties to avoid slump of adhesive while positioning cladding to be bonded.

TradePUR EM400 is based on well known and tested technology which gives a tenacious bond to most building substrates including concrete blocks, brickwork, plasterboard, plaster, ceramic tiles, timber based materials, painted surfaces, most metals and plastics (not polyolefins).

Temperature and moisture content of substrate is important and should be measured carefully prior to application of EM400. Sheets and adhesive should be well acclimatised to the normal working temperature of the building, to alleviate stresses caused by expansion.

TradePUR EM400 is available in a 6.5Kg kits, which is enough to bond 1 to 2 sheets depending on the condition and type of the substrate.

Thorough mixing is of utmost importance and should be completed using a small paddle type mixer in an electric drill, ensuring that the sides of the mixing vessel are scraped down often during mixing. The resulting mix should then be applied without delay to the prepared sheet and put into place immediately. The practice of allowing the adhesive a while to thicken up prior to placing the panel in position should be avoided as it can lead to an assumed bond, which can fail at a later date, leaving bubbles and delamination.  [view datasheet]

Tradebond NM100

Tradebond NM100 is a single pack, elastomeric ‘trowel on’ adhesive which has many advantages over the twin pack system. The product cures to a firm rubber, which is waterproof, and highly resistant to UV degradation.

NM100 will bond at lower temperatures. Optimum performance is achieved at 21°C but NM100 will cure at temperatures as low as 5°C although cure time will be extended.

NM100 will bond to damp surfaces. The moisture content of the substrate for EM400 should be a maximum of 14%, whilst the NM100 will bond to a surface which can ‘feel’ damp to the touch. It will not bond to wet surfaces however.

No mixing required. EM400 needs to be mixed thoroughly or it will not cure fully. NM100 needs no mixing so makes it easier and quicker to use, and also allows it to be used without electrical power to the site.

No Health & Safety requirements. NM100 is free from Isocyanates, acids, alkalis, solvents, halogens and is almost odour free.

Tradebond NM100

Very warm conditions can cause problems with the reduction of viscosity and so should be avoided. This includes the temperature of the substrate, the adhesive, the sheeting and ambient temperature. Very dry substrate should be fogged with water prior to application of NM 100. i.e. Using a spray bottle, fog the area in front of the substrate and allow the ‘fog’ to settle on the substrate.  [view datasheet]

Web Tack

 

Web Tack is a self contained sprayable pressure sensitive contact adhesive which needs no electricity or compressed air, making it ideal for site work where it is difficult to obtain a power supply. It is a multi-purpose product that will bond a wide range of substrates. It has excellent grab and a long open time

Web Tack will bond LamproSystemTM Hygienic GRP Cladding to many substrates including smooth concrete, plasterboard, new plastered surfaces, painted surfaces (test a small area first), plywood and other timber based substrates. Web Tack is ideal for permanent bonds that require good initial bond strength. It provides good temperature resistance and if protected from contamination has an open time of several hours.

All surfaces should be clean, dry and free from dust, grease and any other contaminants liable to impair adhesion. It is particularly important that surfaces should be acclimatised before assembling for at least 48 hours at 20°C or a close as possible to the normal working temperature of the building, with a relative humidity of 45-55%. Air should be allowed to circulate freely around the components.

Connect the hose to the canister and the spray gun to the hose and tighten all the connections. Remove the tip of the gun, open the valve on the canister and spray a small amount of adhesive onto some waste material. Replace the tip and it is ready to spray. It is not necessary to remove tip when changing to a new canister, just when using a new hose or gun. The valve should remain open until the canister is depleted. Turning off the valve before the canister is empty may result in adhesive drying inside the hose and causing blockages. If the product has been stored for a long time, it may be necessary to remove the tip and blow the hose through. This is only required if the adhesive in the hose has started to gel.

Web Tack

Hold the spray gun at 90° to the substrate at a distance of around 250mm, and apply a uniform, generous coat of adhesive ensuring 80-100% coverage. Move the gun in parallel to the substrate and pay particular attention to the edges. Do not allow the adhesive to puddle as this can cause an unevenness that can show through the cladding. On porous surfaces it may be necessary to apply a second coat of adhesive. Always apply to the cladding first and spray one substrate vertically and the other horizontally to ‘cross hatch’ the bond.

It is important to remember that Web Tack is a pressure sensitive adhesive and forms its bonds by sticking to itself so there must be sufficient adhesive for this to happen. The adhesive is ready when it is knuckle dry (you can tap it and no adhesive transfers to your knuckles). [view datasheet]

Tradesil Neutrabond

 

Tradesil Neutrabond is a high quality silicone adhesive based on a neutral curing silicone system supplied in 600ml foil packs. It is used as a bonding agent for trims and is also used in conjunction with the Bostik pad system to fill the voids between strips to give a solid feel to the installation. 

Bostik Pads

 

The Bostik pad system is an instant grab system, which gives a 2mm thick bond line and is used in conjunction with either Tradesil Neutrabond or TradePUR EM400. The pads are put onto the substrate in the form of strips and the voids in between are bonded using either Tradesil Neutrabond or TradePUR EM400 in the normal way, ensuring the adhesives are used in close proximity. i.e. it is important that the adhesive used does not contaminate the pads, but no gaps should be left as this can cause bubbling which in turn, can ‘peel’ the sheet away from the wall. [view datasheet]

Soudaseal Cleanroom

 

Soudaseal cleanroom is a cartridge type sealant, based on MS Polymer technology, which complies to the following tests.

-> IKI (Institut für Krankenhaushygiene, Giessen, Germany) approvals for Disinfection and barrier against microorganisms (on Trespa Meteon panels)

-> FDA CODE 21 §177.2600 (e) tests, by IANESCO (France), rapport 10225, dated 31st October 2002

Soudaseal Cleanroom has an excellent bond and can be used as an adhesive in its own right for bonding lips and edgings while fitting hygienic systems. It is also used as a sealant between panels and in corners where a tough but flexible seal is required. It will resist abrasion and will be very difficult to pick out, making it ideal as a joint sealant in seamless situations. 

Summary

 

Where a dry surface can be attained and the temperature of the substrate is 150C or above, the recommended product would be TradePUR EM400. This would be used on concrete blocks, brickwork, ceramic tiles, timber based substrates, etc. Ideal for irregular surfaces. If surfaces are very bad, use a combination of Bostik Pads and TradePUR EM400.

If there are problems with dampness, or cold substrates, use Tradebond NM100. Not suitable for wet surfaces or areas subject to percolating water. Also ideal where electrical power is not available for mixing.

Very flat surfaces, e.g. new plasterboard, etc can be applied using Web Tack, which will be much faster than either of the two ‘trowel on’ adhesives. Caution - When using Web Tack, you CANNOT apply the sheet and then slide it into place.

Soudaseal cleanroom is a very tough sealant and adhesive, which resists mould growth, microorganisms and pick out. This product has a much higher performance than silicone type sealants.