Description

LAYBOND MULTICRYL is an off-white, non-staining, solvent-free acrylic
dispersion, specially formulated to give high bond strength with a high degree
of initial tack and extremely good resistance to plasticiser migration.

Other advantages over solvent containing acrylics are faster drying and earlier
onset of bonding.

Uses

LAYBOND MULTICRYL is a multi-purpose floorcovering adhesive for internal
use which can be applied to asphalt, concrete, sand/cement screeds, chipboard,
hardboard, plywood and smoothing compounds. It will bond all vinyls (including
cushioned types) and most carpets. For the full range please consult the latest
edition of the Guide To Good Flooring or our Technical Department.

LAYBOND MULTICRYL is suitable for use with underfloor heating installations,
provided the maximum service temperature is not exceeded. However, the
heating should be switched off at least 48 hours before and after installation of the
floorcovering.

Preparation

Relevant Standards:

All phases of the installation should comply with the latest editions of the
following standards:-

BS CP102 Code of Practice for protection of buildings against water from the
ground.

BS 5325 Code of Practice for installation of textile floorcoverings.

BS 8203 Code of Practice for installation of resilient floorcoverings.

Sub-floor

The sub-floor should be clean, structurally sound, dry and free from any
contaminants, including surface hardeners and additives that may hinder
adhesion. It should also have an effective damp-proof membrane and be suitably
dry to receive a bonded floorcovering.

The only British Standard approved test for dryness is by properly calibrated
and insulated hygrometer giving a reading less than 75% RH. Where this has not
been achieved the use of LAYBOND HYDROTITE or LAYBOND SEALDECK
surface membranes will suppress residual moisture in a power floated concrete
slab or sand/cement screed, provided that a base dpm has been incorporated.
Please refer to the appropriate data sheet for full information.

Smoothing Compounds

Any deep indentations in the sub-floor should be repaired using LAYBOND
PLYCORAPID followed by a standard application of the appropriate LAYBOND
SCREEDMASTER SMOOTHING COMPOUND. For smoothing new, uneven
concrete, or other impervious sub-floors LAYBOND SCREEDMASTER 2
LATEX SMOOTHING COMPOUND should be applied at a minimum thickness
of 3mm. Where a concrete base has had a surface treatment, this should be
mechanically removed prior to smoothing compound application.

Priming

Surfaces must be thoroughly cleaned (preferably vacuumed) and be smooth,
dry and free from contamination. Boards and other porous surfaces should
be primed using LAYBOND ISOBOND (diluted 1:6 with water) and allowed to dry.

§ This is particularly important with hardboard, chipboard and plywood.

Application

Porous Surfaces

LAYBOND MULTICRYL should be spread evenly over the floor surface with a
triangular notched trowel cut 1.5mm deep at 5mm centres. For coarse or
embossed backings, the notch size should be increased to 2mm deep at
6mm centres, or deeper if recommended by the floorcovering manufacturer.
The adhesive should be spread with a sweeping motion at a 60º angle and an
open time of approximately 15 minutes allowed prior to placing the floorcovering.
Even pressure should be applied to ensure good overall contact.

Non-Porous Surfaces

For non-porous or low porosity surfaces, e.g. asphalt, LAYBOND
SCREEDMASTER 2 LATEX SMOOTHING COMPOUND should be applied to
a minimum depth of 3mm and allowed to dry overnight to provide an absorption
layer for the adhesive. Application can then proceed as for porous surfaces.
However, where circumstances preclude this treatment either of the following
methods should be used:-

Either:

i) Lay the floorcovering into wet adhesive and apply pressure to obtain good
contact. Pull back immediately and allow the adhesive to reach a touch tacky
state. (Because of its faster drying properties it is quicker than conventional
acrylic adhesives when using the "double drop" technique),

or


ii) Allow the adhesive on the floor to reach a touch tacky state, then place
the floorcovering and press firmly overall to obtain contact. The first method is
preferred where non-porous floorcoverings or those with an inherent curl are being
installed.

SPECIFICATION SUMMARY

Type of Solvent Water based - no volatile organic components.
Flash Point Non-flammable
Approximate Specific Gravity 1.3
Approximate Coverage 45 - 55m² per 15 litres
Application Temperature Limits 5ºC - 30ºC
Service Temperature Limits Up to 40ºC

Note: We endevour to ensure that any advice , recomendation or information we
may give in product literature is accurate and correct. However, we have no control
over the circumstances in which our product is used. No responsability can be
accepted or any warranty given by ourselves, our representatives, agents or
distributors, other than that the product supplied by us will meet our written
specification. Products are sold subject to our standard conditions of sale and
each purchaser and end user should at all times ensure that he has consulted our
latest product and safety information sheets.