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AT 303 Grey underlay plaster for machine application

For machine application of scratch coat of CS IV compressive strength, for cement, cement-lime and lime plaster coatings, inside and outside buildings. Recommended for use for cement-lime plasters ALPOL AT 300, AT 301, AT301L, AT 310, AT 311 and lime-cement plasters ALPOL AT 306, AT 312, AT 316. The plaster can be also applied by hand. Granulation up to 1.6 mm.

 

Package
Single: 25 kg bag

£9.60

Substrate type
Walls made of ceramic and silicate bricks and blocks as well as of cellular concrete blocks. Walls and ceilings made of concrete and concrete elements.

Substrate preparation
The substrate must be clean, sound, dry and free from dirt, dust and grease. Open cracks, chipped areas and irregularities should be patched with ALPOL AZ 130 quick setting mortar or ALPOL AZ 135 levelling mortar. Strengthen loose substrates with ALPOL AG 700 deep-penetrating primer, for highly absorbent substrates use ALPOL AG 708 primer or wet it with plenty of water.

Instructions for use
If applied by hand, mix the contents of the bag with amount of cold and fresh water specified on the package to bring the mixture to homogeneous consistence. When applying with a plastering machine, adjust the consistency in such a way to make the scratch coat a thin textured plaster.  The end of the plastering machine’s spray lance should be held at a distance of not less than 1 m from the machined surface which single “drops” of plaster should settle on. It is a mistake to set a mix to be too thin-bodied causing the material to flow down the wall. Do not level or trowel the scratch coat. Keep the scratch coat moist for at least three days. Before applying further layers of plaster, wet the substrate and the scratch coat with water. .

Tools
Plaster unit, tilting mixer, mixer or low-speed electric drill, darby, trowel, bubble level, container for mortar.

Working conditions
Work in ambient temperatures between +5°C and +25°C. Do not add any other agents. Protect fresh scratch coat from excessive drying and moisture. Do not use electrical heaters (risk of shrinkage cracking) and gas heaters (shrinkage and carbonation processes).

Storage
Store in original, unopened packages in dry place – shelf life 12 months from production date. Protect from moisture during transport and storage.

Notes
The specifications and instructions for use are given for the temperature (20±2)°C and relative humidity of air (65±5)%. The workability may vary in different conditions. Irritating to eyes and respiratory system. Appropriate eye, respiratory and skin protection measures should be used. Becomes alkaline after mixing with water. In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. Keep out of reach of children. Use water to remove fresh dirt or ALPOL AI 770 cleaner to remove hardened dirt. The manufacturer assumes no liability for damage resulting from improper or inappropriate use of the product.

General recommendations
Work according to building practice, observing health & safety standards and regulations.

Specifications
Composition: blend of cement, lime, sand, mineral admixtures and additives
Bulk density approx. 1.6 kg/dm³
Appropriate amount of water* approx. 5.5 dm³/25 kg
Workability approx. 1 h from mixing with water
Fresh plaster pumping interval up to 30 min
Water absorption ≤ 0.2 kg/(m2×min0,5)
Adhesion ≥ 0.25 MPa
Fire resistance class A1
Chloride content ≤ 0.1% Cl
Granulation up to 1.6 mm
Yield approx. 18 dm³ out of 25 kg
Coverage approx. 8 kg/m²

Description

For machine application of scratch coat of CS IV compressive strength, for cement, cement-lime and lime plaster coatings, inside and outside buildings. Recommended for use for cement-lime plasters ALPOL AT 300, AT 301, AT301L, AT 310, AT 311 and lime-cement plasters ALPOL AT 306, AT 312, AT 316. The plaster can be also applied by hand. Granulation up to 1.6 mm.

 

Package
Single: 25 kg bag

Additional information

Weight 25 kg