Petra Aquaresist Lam 1500 | Styrene-butadiene Copolymer Compound

PETRA AQUARESIST LAM 1500 is a water-based compound based on a styrene-butadiene copolymer. It is a black pigmented compound, designed for use as a liquid applied membrane. The product has a bluish black colour but will turn into a black membrane when drying.

This product is used as a liquid applied damp proofing membrane in Sandwich construction in which latex film is protected during its intended lifetime. It can be brush or roller applied on surfaces directly or that have been primed with PETRA AQUARESIST LAM 1500 diluted with 20 to 30 % water or primed with a dedicated primer PETRA AQUAFILM SACP 7000. It is advised to apply a minimum dry thickness of 0.5 - 0.6 mm in two or three coats depends on application methods with a total coverage of approx. 1.20 kg compound per m². The second coat is applied only when the first coat is touch dry: this is usually possible in1 hour after applying the first coat. The compound dries fast and results in a black membrane with high strength and flexibility.

Tests on drying time have been done under the following conditions of temperature and relative humidity:

25°C / 55%

30°C / 80%

A compound film of approx. 0,30mm dry thickness, which is the advised thickness for each of the two coats, was drawn on a Teflon coated glass plate. This substrate has been chosen to eliminate the influence of absorption of water. By doing so it was possible to get a better indication of the drying speed of an applied membrane.

One can expect shorter drying times when the product is applied on porous substrates such as concrete or brickwork. The second coat, however, will need drying times that are more or less in line with what is shown in this graph, as the underlaying first coat will not absorb water from the final coat.

• Membranes of 0,60 mm thickness have been drawn (2 coats) and dried for 7 days at 22°C and 55% RH. Dumbbells were taken from these films and tested on tensile strength and elongation at break.
• Tensile strength: 3,4 N/mm²
• Elongation at break: 380 %
• The same material was soaked for 3 months in tap water and dried again for 7 days:
• Tensile strength: 4 N/mm²
• Elongation at break: 200 %

• The water vapour permeability was measured using Payne Cups and membranes of approximately 0,6 mm thickness. Several tests have been done at different conditions of temperature and relative humidity, as the result of this property is influenced by both parameters.
• At 22°C and 55% RH, a 0,6 mm thick membrane has a water vapour permeability of +/- 5-10 grams per m² per 24 hrs. The same value was found for 35°C and 75% RH.
• Lower values will be found at lower temperatures and higher percentages of humidity.
• It was found that leaching out the membrane in water influenced this property remarkably. The membrane was soaked in tap water for 7 days and dried thereafter for 7 days. The water vapour permeability at 22°C and 55% RH was less than 5 grams per m² per 24 hrs.

• The adhesion strength was measured by means of the pull-off method: a concrete paving slab was coated with 500 grams of product per m² per coat. Two coats have been applied and the total coverage with PETRA AQUARESIST LAM 1500 was 1 kg/m².
• After seven days drying at ambient temperature and humidity (22°C / 60% RH) , ceramic tiles have been placed onto the surface, using a cement based tile adhesive.
• It was found that the quality of the bond failure (strength and place of failure) was ruled by the quality of this adhesive: the use of a low quality adhesive (gauging liquid was water) resulted in low pull-off values because the failure was always for 100% between tile and tile adhesive.
• The typical bond strength under these poor conditions was 0,72 N/mm² after 14 days drying. Soaking for 1 month in water did not have an influence on this result: the same strength and same kind of failure was registered.
• As highest value for bond strength was found 1,7 N/mm² with failures in the epoxy glue and at the interface ‘membrane – tile adhesive’. No bond failure between substrate and membrane has been observed. There was no failure anymore between tile and tile adhesive because the adhesive had been polymer modified with EOC Latex L 6007. The epoxy glue was used to fix the metal disk for pull-off onto the tile surface.
• Soaking in water for 7 days resulted in an average bond strength of 1,2 N/mm² with 80% of the failures at the interface ‘tile – tile adhesive’ and 20% at the interface ‘membrane – tile adhesive’.
• Based on these results it is concluded that still higher bond strength can be achieved when using the ‘right’ adhesive; it is clear that poor quality adhesive or not properly applied adhesive will result in low bonding strength though the adhesion of the membrane on the substrate will not be affected.
• The wet strength will be 1,0 N/mm² or higher, again depending on the tile adhesive quality and eventually on the nature of the tile surface that can cause epoxy glue failures.

• Membrane films of 0,35 mm thickness have been soaked in water for a longer period of time and the relative change in original weight and dimension has been followed up during that period.
• The membrane is capable of absorbing a small amount of water during the initial stage but this stabilizes very soon. There is no further increase in water absorption after a prolonged period of contact with water.

Precautions for safe handling

Precautions for safe handling : Keep container in a well-ventilated place. Avoid contact with skin and eyes.

Handling temperature : 5 - 40 °C

Hygiene measures : Use good personal hygiene practices. When using do not eat, drink, smoke, sniff.

Conditions for safe storage, including any incompatibilities

Maximum storage period : 6 months

Storage temperature : 5 - 40 °C

Storage area : Protect against frost.

Special rules on packaging : Storage in plastic is recommended.

Storage in stainless steel is recommended. Storage containers must be free of contamination before use.

Packaging materials: Plastic. Steel. Stainless steel.

The shelf life of PETRA AQUARESIST LAM 1500 is 6 months in shade off sun at a temperature from +5°C to 30 °C.