Cempatch
SBR

WATERPROOF POLYMER BONDING AID AND MORTAR ADDITIVE

Description:

Cempatch SBR is a pure polymer emulsion, designed to improve the mechanical and waterproofing properties of sand/cement based screeds, mortars and renders. The addition of Cempatch SBR has a strong plasticising effect, thereby allowing a reduction in the water/cement ratio, further improving the flexural, tensile and compressive strength and enabling screeds to be applied down to 10mm and renders down to 6mm.

Usage

The addition of Cempatch SBR will also significantly increase resistance to chemical attack, abrasion and freeze-thaw cycling.

Cempatch SBR applications include:

• As a bonding agent for bonding new concrete to old
• Patch repair compounds
• Industrial floors and screeds
• Water-resistant renders and screeds
• Lining effluent tanks

Materials Supplied

25 and 200 litre containers.

Storage

Protect from frost and store under dry warehouse conditions at a temperature between 10°C and 30°C.

Shelf Life

12 months in unopened containers and stored under good conditions.

Technical Information

Colour	White emulsion
Viscosity @ 20°C	60 - 300 mPa.s
Specific gravity	1.0
pH	9 - 11

Application Instructions

SURFACE PREPARATION

Substrates should be mechanically prepared by bush hammering, grit blasting, etc., to produce a clean, exposed aggregate finish, free from dust, oil, grease, paint, laitance, etc., in order to provide a ‘key’ for the Cempatch SBR. The clean, sound surface should be dampened with water prior to application of the bonding primer, modified mortar or render. All excess water must be removed prior to application.

PRIMING

A coat of 3:1:1 OPC : Cempatch SBR : water grouting slurry should be applied to the pre-dampened surface with a mediumstiff brush.

Systems to be bonded must be placed whilst the primer remains tacky. The priming coat must be worked into the surface with a stiff brush or broom, ensuring uniform wetting of the substrate.

If the primer is allowed to dry, apply a second coat. Do not redampen dried primer.

APPLICATION

Once mixing is complete, apply the mix onto the primed area and work well into the substrate. For levelling and consolidating, tamp with a screed bar and then rub with a plastic float. A smooth finish is achieved by light trowelling with a straightedged steel trowel.

If greater depths are required on both vertical and overhead applications, this may be carried out by building up in layers with the surface of the intermediate layer being scratch -keyed and cured prior to the further application of the slurry primer and mortar when the material has set up.

CLEANING

All equipment should be cleaned with water immediately after use.

CURING

Cempatch SBR applications are cement based and in common with all such materials, must be cured in accordance with good concrete practice. The use of polythene sheeting is recommended for a minimum 7 days to prevent rapid drying out. Alternatively a curing aid such as Setseal 6 can be used (see appropriate technical data sheets).

The system should be allowed to cure for a minimum 7 days at 20°C before subjecting to full service conditions.

WORKING TIME

Cempatch SBR has a working time of approximately 20 minutes at 20°C. Never leave Cempatch SBR mixes to stand for any length of time before laying as this will considerably shorten the working time

Never leave Cempatch SBR mixes to stand for any length of time before laying as this will considerably shorten the working time.0.

PRECAUTIONS

Do not place when the substrate temperature is below 5°C or when the ambient temperature is 5°C and falling.

HEALTH AND SAFETY

Consult the appropriate Material Safety Data Sheets prior to using Cempatch SBR.