Concure A99: Water-Based Acrylic Concrete Curing Compound

Product Overview

Concure A99 is a water-based acrylic curing compound manufactured by Fosroc International Limited and distributed by Parchem Construction Supplies. It is specifically formulated to promote proper hydration and strength development in concrete by facilitating water retention at the concrete surface during the critical early curing period.

Composition & Physical Characteristics

Concure A99 is composed of a liquid acrylic emulsion that dries to form a transparent protective film on concrete surfaces. The product is presented as a milky white stable emulsion with the following measured properties:

Property	Specification
Appearance	Milky white liquid
Density	1.009 kg/L (AS3799.3.1.9)
Viscosity	0.09 Pa.s (AS3799.3.1.5)
Non-volatile Content	30.69% (AS3799.3.1.2)
VOC Content	163g/litre
Drying Time (Tack Free)	4 hours (AS3799.3.1.4)
Trafficable Time	24 hours
Emulsion Stability	0.89% (RMS T862)
Residue 150μm	0.05% (AS3799.3.1.6)

Key Performance Specifications

Water Retention Efficiency

Concure A99 achieves a water retention efficiency of 90%, measured according to AS3799.3.1.2 standards. This exceptional water retention capability is the product's primary mechanism for facilitating concrete curing by reducing water loss from the concrete matrix.

Coverage Rate

The product provides a coverage rate of 5 square metres per litre when applied at the specified thickness.

Application Temperature Range

• Minimum: 5°C
• Maximum: 35°C

Standards Compliance

Concure A99 complies with multiple international and national standards:

• AS3799-1998: Class D, Type 1 curing compound (Boral Ref 258/23)
• AS/NZS 4020:2018: Suitable for use in contact with drinking water at an exposure level of 15,000mm² per litre (AWQC Ref 130335-2020-CSR-8)

Container Sizes & Product Codes

Concure A99 is supplied in the following container variants:

Container Size	Product Code	Availability
20 litre	FC600909-20L	Standard stock
205 litre	FC600909-205L	Standard stock
1000 litre	FC600909-1000L	Made to order (Min: 1 unit, Lead time: 21-28 days)

Primary Uses & Applications

Concure A99 is recommended for:

• Freshly laid concrete surfaces including renders, structural concrete, and mass concrete both indoors and outdoors
• Situations where conventional wet curing methods are difficult to maintain
• Off-form vertical concrete as a clear sealer
• Finished cementitious materials including Nitobond SBR mortars and renders
• Repair mortars such as Guncrete E and Renderoc products
• Exposed grout areas following grouting operations with products such as Conbextra BB92 and Conbextra HF

Key Advantages

• Water retention efficiency of 90% enabling effective concrete curing
• Environmentally friendly water-based formulation
• Rapid film formation on concrete surfaces
• Will not yellow in sunlight exposure
• Economical application and coverage
• Seals concrete surfaces while curing
• Accepts most acrylic-based after trades without requiring removal
• Eliminates the need for damp hessian, sand, or polythene sheeting in conventional wet curing methods

Application Instructions

Surface Preparation

Ensure the concrete surface is completely free of stains, oils, form coatings, and other contaminants to obtain good adhesion and avoid discoloration or uneven surface effects.

Timing of Application

Spray Concure A99 evenly over freshly laid concrete as soon as possible after final trowelling and just after the disappearance of surface bleed water for maximum water retention (approximately 1 to 2 hours depending on ambient temperature and atmospheric conditions).

Application Methods

Preferred method: Spray application using appropriate spray equipment

Alternative methods:

• Soft brush application
• Broom application
• Wide nap roller application

Coverage Rate

Apply at an even coverage rate of not greater than 5m²/litre

Application Technique

Multiple thin coats are recommended to avoid milky discoloration when dry. Coats applied too thickly may remain a milky colour when dry.

Vertical Surfaces

Apply to vertical surfaces immediately after the formwork has been removed

Important Limitations & Restrictions

Incompatible Applications

• Do not use with metallic-based integral floor hardeners (use Concure CR instead to prevent rusting of aggregate)
• Do not recommend direct stick timber or parquetry flooring products over Concure A99

Timing Constraints

• Do not brush onto soft, wet concrete or render surfaces which will be disturbed and prevent curing film formation
• Do not apply too soon after trowelling finishes when used as a combined curing compound/sealer to limit bleed water affecting adhesion

Testing Requirement

A test trial application must be performed and approved before proceeding with the full job

Storage Requirements

• Storage Temperature Range: 5°C to 35°C
• Packaging: Original unopened packaging
• Storage Conditions: Dry conditions
• Frost Protection: Must be protected from frost
• Shelf Life: Standard commercial shelf life in proper conditions

Storage Precautions

Do not use if:

• Lumps are present in the product
• Product has a bacterial or rotting smell
• Material has discoloured

Cleaning & Maintenance

Concure A99 should be removed from tools and equipment with water immediately after use. Cured material can only be removed mechanically.

Product Safety & Documentation

• A Safety Data Sheet (SDS) is available from the Fosroc website
• A Technical Data Sheet (TDS) provides comprehensive product knowledge and usage instructions
• In emergency situations, contact any Poisons Information Centre (phone 13 11 26 within Australia) or consult a doctor

References

• [1] Fosroc_Concure_A99_TDS.pdf
• [2] Fosroc_Nitobond_SBR_TDS.pdf
• [3] Fosroc_Guncrete_E_TDS.pdf