The liquid plastic Purelastik
Purelastik is a 1-component system based on aqueous polymer dispersions. Originally, Purelastik was developed by ISOPOL to protect polyurethane roof spray foam from UV exposure in the long term. The need for this liquid plastic was given because most of the products offered for UV protection had to be replaced after only a few years. At the time of development, trade with this liquid plastic was not envisaged.
Another criterion was to develop a product that would not swell in standing water. This requirement ruled out "cheap" fillers even at the development stage. The system had to be free of solvents and avoid application errors in advance.
The very good long-term resistance, tested by the State Materials Testing Office MPA-NRW in Dortmund, then led to its use as a stand-alone waterproofing system using a fleece insert in full reinforcement.
A direct comparison of the liquid plastic Purelastik
There are many "liquid applied roof sealants" on the market. The guideline for the European technical approval ETAG 005 regulates the technical requirements = minimum requirements. For the interested user we recommend the test report with all individual tests for Purelastik under "Service" in the download area.
In direct comparison with other liquid plastics for roof waterproofing, the ease of application of Purelastik is immediately apparent. The product is ready for immediate application as delivered. When processed by machine, up to 5% water can be added to the product to improve viscosity (flowability). Tools and machines can be cleaned with water after use. Odor nuisance can be neglected. To shorten the time until rain resistance, our Speedcat (80 - 100 g/sqm) can be sprayed on the finished surface. Speedcat is a film-forming agent and, as the name suggests, the roof coating immediately forms a rainproof skin. Speedcat can be applied with a conventional garden sprayer in a finely atomized form. A light spray is sufficient to achieve the desired result.
For polyurethane systems, we distinguish between "aromatic" and "aliphatic". Aromatic coating systems are not resistant to UV light. Sunlight causes them to discolor and chalk on the surface. Therefore, these systems must be additionally protected with a topcoat. Aliphatic systems are UV-resistant, but cost up to three times as much as an aromatic coating. In most cases, the layer structure is such that the less expensive system is used up to the desired layer thickness and the finished surface is then sealed aliphatically. Odor during and after processing is moderate to strong, depending on the solvent. There are single and multi-component polyurethane systems. With multi-component systems, the processing time is relatively short, but the rain resistance is also short. Solvents, e.g. MEK (methyl ethyl ketone) or butyl acetate, must be used for cleaning work. Respiratory protection is recommended during processing.