PRODUCT DATA SHEET

Sikalastic®-1 KMY
One component fiber reinforced, flexible cementitious waterproofing com-
pound

DESCRIPTION CHARACTERISTICS / ADVANTAGES

Sikalastic®-1 KMY is a one component, flexible, fiber- ▪ Easy to apply by brush, roller or trowel
reinforced mortar, based on cement modified with ▪ Can be applied on damp substrate
special alkali-resistant polymers. It also contains fine ▪ Good sag resistance and easy to apply on vertical
fillers, selected graded aggregates, plus special water- surfaces
proofing additives to produce a flexible mortar that is ▪ Flexible crack-bridging properties
ideal for waterproofing surfaces subject to flexural ▪ Very good adhesion to most common substrates
strain. (concrete, cementitious mortar, stone, bricks, ceram-
ic and timber)
USES ▪ Mixing ratio can be adjusted in order to obtain the
consistency and workability
▪ Waterproof protection of concrete structures includ-
ing tanks, basins, pipes, swimming pools APPROVALS / STANDARDS
▪ Waterproofing external wall surfaces to be backfilled
in the ground ▪ SPAN Approval (Potable Water)
▪ Internal waterproofing of walls and floors, in base- ▪ SINGAPORE GREEN LABEL: 032-118-3205 "Environ-
ments, etc mentally Preferred Coating"
▪ Waterproofing of terraces and balconies over con-
crete or prepared existing tiles
▪ General waterproofing of concrete surfaces
▪ Compatible with SikaCeram® series, tilling system

PRODUCT INFORMATION
Composition Cement modified with polymers, selected aggregates, admixtures, addit-
ives and fibers.
Packaging ▪ 20 kg bag
▪ 4 packs × 3 kg in box
Shelf Life 6 months from date of production
Storage Conditions Store properly in dry conditions, in undamaged and unopened, original
sealed packaging. Protect from direct sunlight, rain and water. Not sensit-
ive to frost.
Appearance / Colour Grey powder
Density Fresh mortar density: ~1.5 kg/l (at + 25 °C)

Product Data Sheet

Sikalastic®-1 KMY
December 2023, Version 04.01
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TECHNICAL INFORMATION
Tensile Strength 2.0 N/mm² (ASTM D412)

Elongation at Break > 23 % (ASTM D412)

Crack Bridging Ability > 0.50 mm (Class A 3, +23 °C) (EN 1062-7)
≥ 0.75 mm (+23 °C) (EN 14891 A.8.2)

Tensile Adhesion Strength On concrete, 28 days

Dry substrate 1.3–1.5 N/mm² (ASTM D 7234-12,
20 mm Ø dolly)

APPLICATION INFORMATION
Mixing Ratio Application by roller ~0.35 L of water per 1 kg
Application by brush ~0.3 L of water per 1 kg
Application by trowel ~0.22 L of water per 1 kg

Consumption This depends on the substrate roughness; as a guide, ~1.0 kg/m²/mm

Sikalastic®-1 KMY must be applied in minimum 2 coats
Wet areas such as toilets, balconies: 2.0 kg/m²
Critical areas such as swimming pools, ponds: 3.0 kg/m²
Ambient Air Temperature +5 °C min. / +40 °C max.
Substrate Temperature +5 °C min. / +40 °C max.
Pot Life ~30 minutes (at +23 °C)
Waiting Time / Overcoating Sikalastic®-1 KMY must be completely hardened before over-coating or
water contact.
Guide for waiting times at the following temperatures:
+20 °C
Horizontal coving by tiles ~2 days
Vertical covering by tiles ~2 days
Water emulsion coating ~2 days
Immersion in water ~2 days
Contact with drinkable water ~15 days
Times will vary due to ambient and substrate humidity.

BASIS OF PRODUCT DATA ECOLOGY, HEALTH AND SAFETY

All technical data stated in this Product Data Sheet are User must read the most recent corresponding Safety
based on laboratory tests. Actual measured data may Data Sheets (SDS) before using any products. The SDS
vary due to circumstances beyond our control. provides information and advice on the safe handling,
storage and disposal of chemical products and con-
IMPORTANT CONSIDERATIONS tains physical, ecological, toxicological and other
safety-related data.
▪ Avoid application under direct sun light, rain and/or
strong wind. Setting time can be influenced by high APPLICATION INSTRUCTIONS
relative humidity, particularly in closed rooms or
basement. Adequate ventilation is recommended SUBSTRATE QUALITY / PRE-TREATMENT
when applying Sikalastic®-1 KMY.
▪ Protect from rain for at least 24–48 h after applica- The substrate must be structurally sound, free of ce-
tion. ment laitance, clean and free from dirt, oil, grease or
▪ If a solvent based paint must be painted on Sikalast- other contaminants. Loose or friable particles must be
ic®-1 KMY, carry out preliminary testing in order to removed.
ensure the solvents do no damage the waterproofing Remove all previous coatings, any traces of grease,
layer. rust, release agents, cement laitance and any other
material which could reduce adhesion, by means of
blastcleaning, high-pressure water-jetting (150–200
bar), wire brushing, grinding and abrading of ceramic

Product Data Sheet

Sikalastic®-1 KMY
December 2023, Version 04.01
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tiles etc. All dust deposits must also be removed by va- Joints / Critical areas
cuum or any other appropriate method. At floor joints and other critical areas (for example,
Repair concrete substrates, if deemed necessary, with any junctions with vertical surfaces), the watertight-
an appropriate cementitious mortar from the ness can be reinforced by using Sika® SealTape-F. Sika®
SikaTop® or Sika MonoTop® range of repair materials. SealTape-F must be fixed directly onto the first coat
All connections between the substrate and pipe of Sikalastic®-1 KMY whilst it is still wet, and then
entries, plant and equipment, light switches etc., must covered by a second coat of Sikalastic®-1 KMY.
be sealed and watertight. Use coved details at the
floor/wall junctions made from SikaTop® or Sika CURING TREATMENT
MonoTop® mortars, for optimal waterproofing per-
Generally not required but precautions should be
formance.
taken for applications done directly under sunlight and
The substrates can be dry or damp. Do not apply
windy condition.
Sikalastic®-1 KMY on substrates with stagnant water
or water ponding and subtrates where condensation is CLEANING OF TOOLS
likely to occur. All joints, pipe penetrations and
oulets/inlets in the structure must also be sealed and Clean all tools and application equipment with clean
made watertight. water immediately after use. Hardened or cured ma-
terial can only be removed mechanically.
MIXING
Sikalastic®-1 KMY should be mechanically mixed using LOCAL RESTRICTIONS
a forced-action mixer or in a clean drum using a low
speed electric drill and paddle mixer (maximum 500 Please note that as a result of specific local regulations
r.p.m.). Mix slowly by adding Sikalastic®-1 KMY into the performance of this product may vary from coun-
the water (For the quantity of water, see mixing ratio). try to country. Please consult the local Product Data
Once a homogeneous mix is obtained, continue to mix Sheet for the exact description of the application
for another 3–4 min. The mortar must be completely fields.
homogeneous and free from lumps. Do not add any
other additives. Mix the whole bag, in order to avoid LEGAL NOTES
any inadequacy in the distribution of the constituents.
Do not use a free-fall mixer to mix Sikalastic®-1 KMY. The information, and, in particular, the recommenda-
tions relating to the application and end-use of Sika
APPLICATION products, are given in good faith based on Sika's cur-
rent knowledge and experience of the products when
Trowel properly stored, handled and applied under normal
Maintain an even pressure onto the substrate's sur- conditions in accordance with Sika’s recommenda-
face to ensure a uniform distribution and thickness of tions. In practice, the differences in materials, sub-
Sikalastic®-1 KMY. Trowel in two directions (at right strates and actual site conditions are such that no war-
angles). Maximum recommended thickness is 2 mm ranty in respect of merchantability or of fitness for a
per coat. The final thickness when applied by trowel particular purpose, nor any liability arising out of any
will depend on the method of application and level or legal relationship whatsoever, can be inferred either
grade of exposure / waterproofing required. The from this information, or from any written recom-
highest waterproofing performance is obtained by ap- mendations, or from any other advice offered. The
plying Sikalastic®-1 KMY using a trowel in at least 2 user of the product must test the product’s suitability
coats, to a total thickness of 3–4 mm. for the intended application and purpose. Sika re-
*Spray application is applicable with the correct serves the right to change the properties of its
equipment. Please consult Sika’s representative for products. The proprietary rights of third parties must
more information. be observed. All orders are accepted subject to our
Brush or Roller current terms of sale and delivery. Users must always
Application by brush or roller must be undertaken refer to the most recent issue of the local Product
with maximum attention to completely cover the sub- Data Sheet for the product concerned, copies of which
strate's surface uniformly. Brush or roll in two direc- will be supplied on request.
tions (at right angles). The maximum recommended
thickness for these method of application is 1 mm per
coat. In these situation, the application of min. 2–3
coats is required.

Sika Kimia Sdn. Bhd.

Lot 689, Nilai Industrial Estate,
71800 Nilai, Negeri Sembilan D.K.
Malaysia
Phone: +606-7991762
e-mail: info@my.sika.com
Website: www.sika.com.my

Sikalastic-1KMY-en-MY-(12-2023)-4-1.pdf

Product Data Sheet

Sikalastic®-1 KMY
December 2023, Version 04.01
020701010010000288

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