Construction Additives
THIXOTEX · Carboxylated SBR Polymer Emulsion

SBR LATEX

BONDING, REPAIR, FLEXIBILITY & WATER RESISTANCE

High-performance aqueous carboxylated styrene-butadiene rubber emulsion used as an integral bonding modifier, waterproofing agent and plasticizer in cementitious mortars, concrete repair systems, adhesion slurries, screeds and thin overlays.

Chemistry: Carboxylated SBR Solids: 45 ± 1% pH · 25°C: 9.0–10.5 Specific Gravity: 1.01–1.04
45% Nominal solids · ±1%
20–150 Viscosity · mPa·s / cP
0.15–0.22 µm Polymer particle size
-5 to +5°C Tg · flexible grade
Polymer-modified cement technology

BUILD THE BOND.
BRIDGE THE CRACK

SBR latex modifies the cement matrix rather than simply coating it. During hydration, microscopic polymer particles pack into capillary spaces and coalesce into an elastic film that interpenetrates the rigid cement-hydrate structure.
The resulting polymer–cement co-matrix is designed to improve adhesion, flexural performance, water resistance, durability and crack tolerance in properly formulated systems.

LIQUID POLYMER MODIFIER FOR CEMENTITIOUS SYSTEMS

Milky-white, free-flowing, water-based carboxylated styrene-butadiene copolymer emulsion for construction systems requiring stronger bond, flexibility and lower water ingress.

01

Bond modification

For bonding slurries, repair mortars and overlays.

02

Flexible film

Low-Tg polymer phase improves ductility.

03

Water resistance

Reduces capillary ingress in the referenced systems.

04

Chloride-free

Specified chloride ion below 0.01%.

THIXOTEX construction latex polymer modification diagram
POLYMER MECHANISM

FROM LATEX PARTICLES
TO AN ELASTIC CO-
MATRIX

The TDS describes polymer-film coalescence as capillary water is consumed during cement hydration, allowing SBR particles to pack and form a continuous flexible phase.

HOW THE MATRIX DEVELOPS

01 · Disperse

SBR particles distribute throughout the fresh cement paste.

02 · Hydrate

As free water decreases, polymer particles move closer together.

03 · Coalesce

Particles form an elastic continuous polymer film.

04 · Interpenetrate

The polymer film interacts with the C-S-H skeleton and substrate interface.

SBR LATEX

150–220 nm

HYDRATION

water decreases

POLYMER FILM

elastic co-matrix

ELASTIC SBR FILM + CEMENT HYDRATE CO-MATRIX

Conceptual mechanism. Actual microstructure depends on polymer/cement ratio, curing, cement chemistry and water content.

Primary Application Ratios

FOUR CORE CONSTRUCTION USES

Ratios below follow the supplied SBR Latex TDS and should be optimized in the actual cement, aggregate and substrate system.

01 · Bonding slurry

Cold Joint / Bond Bridge

Brush onto pre-wetted sound concrete and place overlay mortar wet-on-wet before the slurry skins.

SBR : OPC = 1:1 to 1:1.5 by volume
02 · Repair mortar

Structural Patch & Repair

Supports lower water demand, better adhesion and flexural performance.

15–20% on cement weight
03 · Waterproofing

Flexible Cement Slurry

Two-coat slurry systems for terraces, tanks, basements and retaining walls.

SBR : Cement = 1:1.5 to 1:2 by weight
04 · Screeds & overlays

10–25 mm Floor Systems

Supports impact resistance, abrasion protection, dust suppression and durability.

10–15% on binder weight
Application environment

BOND. REPAIR. WATERPROOF. OVERLAY.

Ready-mix concrete truck transporting formulated concrete

Flexible Cementitious Waterproofing

SBR latex modifies cement slurry to improve bond, flexibility and resistance to water ingress in properly formulated systems.

High-rise concrete pumping and placement

Floor Screeds & Thin Overlays

Polymer modification supports bond and abrasion performance in thin sections.

Wet-mix shotcrete application on reinforced surface

Repair & Crack-Prone Interfaces

A more ductile polymer phase helps reduce brittleness at repaired interfaces.

Technical data sheet

FULL
SPECIFICATION

Liquid-emulsion specifications from the supplied SBR Latex technical data sheet.

Batch control: The agreed sales specification and batch COA should govern final product acceptance.

THIXOTEX liquid SBR latex construction polymer emulsion
Parameter Guaranteed Specification Test Standard
Chemical Nature Carboxylated Styrene-Butadiene Copolymer Raw material declaration
Appearance Milky white, free-flowing liquid Visual examination
Solid Content 45.0% ±1.0% · range 40–50% ISO 3251 / ASTM D1417
pH · 25°C 9.0–10.5 ISO 976 / ASTM E70
Viscosity · Brookfield #2 @60 rpm 20–150 mPa·s · cP ISO 2555 / ASTM D2196
Specific Gravity · 20°C 1.01–1.04 g/cm³ ISO 2811 / Pycnometer
MFFT +3°C to +8°C ISO 2115 / ASTM D2354
Glass Transition · Tg -5°C to +5°C · flexible grade DSC · ASTM E1356
Particle Size 0.15–0.22 µm Laser diffraction
Stabilizing Emulsifier Anionic / Non-ionic surfactant matrix Formulation standard
Residual Monomers <500 ppm total · <0.05% Headspace GC
Freezing Point ≈0°C · water base; keep frost-free Physical observation
Chloride Ion <0.01% EN 480-10
Modified Mortar Performance

STRONGER BOND. MORE FLEX. LOWER WATER INGRESS.

Comparative reference performance

Values below reproduce the reference metrics in the supplied TDS for modified vs. plain mortar.

Tensile adhesion
3.2 MPa · +255%
Flexural strength
11.5 MPa · +130%
Water absorption
1.8% · -76%

Grey = unmodified · magenta/green = SBR modified · visual lengths normalized

Compressive strength · 28 d

Plain: 32–36 MPa · SBR modified: 40–48 MPa

Flexural strength · 28 d

Plain: 4.5–5.5 MPa · SBR modified: 9.0–12.0 MPa

Adhesion to concrete

Plain: 0.8–1.1 MPa · SBR modified: 2.5–3.5 MPa

Capillary absorption

Plain: 6.5–8.0% · SBR modified: <1.5–2.0%

Freeze–thaw

TDS reference: >300 cycles without scaling

Mechanical mixing of SBR latex modified cement mortar
MIXING & HANDLING

CONTROL AIR. BUILD A UNIFORM POLYMER–CEMENT MATRIX.

The supplied TDS recommends low-speed mechanical mixing to avoid excessive air entrainment.

300–400 rpm

Recommended low-speed mechanical mixing.

3 minutes

Reference mixing time from the supplied TDS.

Air below 6–8%

Monitor total mortar air content.

Wet-on-wet bonding

Place repair/overlay mortar before the bonding slurry skins.

THIXOTEX liquid latex packaging in pails, drums and IBC containers
SUPPLY & STORAGE

FROM PAIL TO IBC.

The supplied TDS specifies three industrial pack sizes.

20 kg

HDPE pail

200 kg

Drum

1000 kg

IBC container

Store at +5°C to +35°C. Protect strictly from frost. Shelf life: 12 months in unopened original packaging.
Technical questions

FAQ

Practical SBR latex formulation questions covering bonding, repair mortars, waterproofing, mixing and storage.

What is the chemistry of THIXOTEX construction latex?
THIXOTEX is a water-based, carboxylated styrene-butadiene copolymer emulsion with nominal solids of 45.0% ±1.0%, as specified in the supplied technical data sheet.
What is the recommended bonding-slurry ratio?
The supplied TDS specifies an SBR Latex : fresh OPC ratio of 1:1 to 1:1.5 by volume. Apply the bonding slurry to pre-wetted, sound concrete and place the overlay mortar wet-on-wet before the slurry skins.
What dosage is used in repair mortar?
The specified dosage is 15–20% by weight of cement, equivalent to approximately 7.5–10 kg of SBR Latex per 50 kg of OPC. Confirm the final dosage through application trials.
What ratio is used for flexible waterproofing slurry?
The supplied TDS specifies an SBR Latex : cement ratio of 1:1.5 to 1:2 by weight for the referenced flexible cement-slurry system, applied in two coats.
What dosage is used for screeds and overlays?
The referenced 10–25 mm screed and overlay systems use 10–15% SBR Latex by weight of binder. Optimize the dosage for the actual binder, aggregate and substrate system.
Why does SBR improve adhesion?
The supplied TDS attributes improved adhesion to polymer-film formation and carboxyl-group interaction with calcium ions at the cement/substrate interface. Actual performance depends on surface preparation, formulation and curing conditions.
Does SBR reduce water absorption?
In the TDS reference system, capillary absorption decreases from 6.5–8.0% for plain mortar to below approximately 1.5–2.0% for SBR-modified mortar. Actual results depend on the formulation and curing.
What mixing speed and time are recommended?
The supplied TDS recommends low-speed mechanical mixing at approximately 300–400 rpm for 3 minutes to help avoid excessive air entrainment. Monitor the total air content of the finished mortar.
How should THIXOTEX construction latex be stored?
Store the product at +5°C to +35°C and protect it strictly from freezing. Keep it in its original packaging under the storage conditions specified in the supplied TDS.
What is the shelf life of THIXOTEX?
The supplied TDS states a shelf life of 12 months in unopened original packaging. Follow the stated storage conditions and check the batch label before use.

Need Our Services?

Call: +91 97695 93030

Work Hours

Mon – Sat: 9:00 AM – 6:00 PM IST

Email Us

support@geoconproducts.com