Masonry Cleaner HP

MASONRY CLEANER HP
Masonry Cleaner HP is a chemical cleaner for the removal of dirt and grime from sandstone,
unpolished granite, brick and terra cotta. It will remove iron stains from masonry and
contains agents to prevent iron stain formation on the stone face. It is economical and fast
acting, removing dirt and surface discolorations.

PRODUCT DESCRIPTION
Masonry Cleaner HP is a green acidic liquid, which contains less than 12% Hydrofluoric
Acid and surface-active agents. When adequately diluted, as by the jetting off procedure the
organic materials are completely biodegradable. Competent stone cleaning contractors should
only use the product. It contains chemicals to prevent iron stain migration and conforms with
BS 8221-1:2000 (The Code of Practice for the cleaning of Stone and Masonry)

SAFE HANDLING
At any time when this product is being transported, or being used, persons handling or
carrying the product should have available a drum of clean water for use in emergencies and
HYDROFLUORIC ACID ANTEDOTE GEL for immediate treatment of accidental splashes
or burns. Containers must be stored in a safe place with caps secured, and a trained
responsible person(s) detailed for security in depots, in transit and on site. Only competent
persons should handle this product.

PRE CLEANING RECOMMENDATIONS
Large organic deposits should be removed either by a scraper or by power water jetting. The
product should be applied on pre-wetted degreased surfaces. The prior use of a degreasant is
often essential to ensure quick and even cleaning performance. Adequate protection of glass
and polished granite is essential.

HOW TO USE THE PRODUCT
Establish the detailed method and contact time by a test patch. Apply the product by means of
a fibre bristle brush, working it into the masonry face and leaving a visible coating on the
surface. The product may be used as supplied on granites and sandstones but should be
diluted at least 50/50 with water before use on brick or terracotta. When diluting ensure that
the proportions are not varied and that the container is well stirred. Work to distinct
boundaries. Normal contact time would be extended up to 30 minutes maximum. It is
preferable to repeat short contact treatments instead of using longer contact times; also
degreasing treatments prior to using Masonry Cleaner HP greatly improves results.

COVERAGE
Approximately 3-4m²/l.
MATERIALS TO BE AVOIDED
Glass, polished granite, glazed aluminium, zinc, bronze, brass, copper and lead. Masonry
Cleaner HP is preferred for use on red sandstone. Some sandstone may become coloured due
to iron migrating on to the stone face where it associates with dirt and carbon deposits.
Masonry Cleaner, whilst removing the surface dirt will also remove this old migrated iron
colouration. The verification of any colouration changes should be observed during test trial
work. The product is not suitable for use on limestone, Portland stone, Bath stone, marble,
slate or calcited materials.

PROTECTION OF OPERATIVES
Chemical protection suits are needed along with PVC gauntlet gloves, face shields. Head
cover and also suitable footwear. A bucket of clean water for emergency use should be to
hand. Nobody must be allowed to pass underneath or work under cleaning areas. Spillages
must be washed down immediately. At the end of the work period, wash down all equipment
eg. Scaffolding and boards. A Hydrofluoric burns kit should be at hand for the treatment of
any acid burns.

Only experienced operatives should handle this product.
When empty the containers should be filled with water and then emptied and disposed in an
approved manner.