Page 34 - 2018 DIGITAL BROCHURE

NATCEM AC

Method of use Application

Preparing the surface Priming General Setting times Storage How to specify
Do not use on frozen or There is no need to prime any Place the material as quickly NATCEM AC is designed to NATCEM AC is packaged in a NATCEM AC shall be mixed and
overheated substrates (Outside reinforcement, but if priming as possible after mixing using commence setting at 35 minutes polythene inner bag with applied to prepared surfaces all
the range of 0˚c-30˚c). Prepare the is preferred, any conventional traditional tools. A 3mm minimum and finish setting at 40 minutes at re-sealable tie in a stitch sealed strictly in accordance with the
surface in advance to provide an system may be used. thickness of the material is 20˚c. In winter NATCEM AC can woven polypropylene outer bag manufacturer’s instructions.
adequate key. It should be clean, On reinforcement it is only always necessary. DO NOT apply be used down to 0˚c. The set will that should be stored in dry
free from dust and thoroughly necessary to remove the loose additional water to the surface be slower but can be accelerated conditions and will remain usable Precautions
dampened. Where necessary rust, which can be done by wire during finishing as this may cause by using warm water. In very hot for at least twelve months. We strongly recommend the
steel or aluminium mesh can brushing. surface cracking. Once setting temperatures the set will be faster use of GLOVES, GOGGLES and
be used. Ensure that a 3mm has started DO NOT attempt to and can be slowed by using cold Yield MASK. Please see SDS sheet
minimum thickness of material is remix or to smooth the surface, water. Generally 1 x 25kg bag of for full details.
obtained. this will cause the mechanical NATCEM AC mixed with 5 litres of
properties in particular strength Cleaning water will produce approximately Approved to Reg 31 for
and adhesion to be lost. NATCEM AC should be removed 10 litres of finish mortar. use in public water
from tools and equipment and supplies. Secretary of
Mixing cleaned with water immediately Disposal of Waste state for D.E.T.R.
APPLICATION BY TROWEL after use. Via an authorised waste disposal Approved.
If one bag or less is to be mixed it should be mixed with a rose bud type paddle attached to an electric drill contractor to an approved waste 6th May 2015
(900 rpm, 1000 W). Mix vigorously for at least 2 minutes after adding all the mixture to the water. NATCEM AC disposal site, observing all local DWI 56.4.840
is designed to give a fluid mix but this only develops after sufficient mixing. For larger quantities, optimum mix and national regulations.
results can be obtained using conventional mixing machines. When applying by plastering methods, add the
NATCEM AC gradually to 5 litres of clean water per bag, whilst mixing continuously. The mix will appear dry Setting time & strength gain
at first. Continue mixing until fluidity develops. If greater fluidity is required additional water may be added to a
total of 5.5 litres per bag. Exceeding this ratio will lead to lower strength and a longer setting time. In cold weather Start Set 35 Min at 20°c
the set can be accelerated using warm water, likewise in hot weather cold water can be used to slow down the End Set 40 Min at 20°c
set.
Compressive
APPLICATION BY BRUSH OR ROLLER Strength (Mpa)
If one bag or less is to be mixed it should be mixed with a rose bud type paddle attached to an electric drill
(900 rpm, 1000 W). Mix vigorously for at least 2 minutes after adding all the mixture to the water. NATCEM AC 1 Hour 4
is designed to give a fluid mix but this only develops after sufficient mixing. For larger quantities, optimum mix 3 Hours 5
results can be obtained using conventional mixing machines. When applying by brush or roller methods, add 24 Hours 9
the NATCEM AC gradually to 6 litres of clean water per bag, whilst mixing continuously. The mix will appear 7 Days 13
dry at first. Continue mixing until fluidity develops. If greater fluidity is required additional water may be added 28 Days 32
to a total of 6.5 litres per bag. Exceeding this ratio will lead to lower strength and a longer setting time. In cold
weather the set can be accelerated using warm water, likewise in hot weather, cold water can be used to slow Strength continues to develop thereafter.
down the set. When applying by brush or roller, two coats may be necessary to ensure no pinholes and
adequate 3 mm minimum thickness. Ensure that the first coat has set prior to application of the second coat
and that the surface of the first coat is well wetted prior to the application of the second coat.

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