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H E IVI PAS IL silicone-based fouling release The high-activity approach to surface coating

The new dimension in surface contact • Fouling release Meeting the challenge < Environmental advantage • Fuel savings Specifications Business as usual Roughness or smoothness?

surface contact HEMPASIL silicone-based fouling release systems open up a new dimension in fouling control. HEMPASIL systems feature a "non-stick" surface that is smooth and flexible, with exceptionally low surface tension. HEMPASIL technology is biocide-free. This provides an environmentally sound fouling release solution because the effect is due to the water-repellent physical properties of the surface, instead of the coating exerting a chemical effect on This provides two breakthrough advantages. Fouling organisms find it extremely difficult to adhere to a HEMPASIL-treated surface, and...

How does silicone-based fouling release work? Fouling release systems are basically designed to hinder a wide variety of organisms from adhering to coated surfaces. Early fouling release coatings incorporated polytetrafluoro- ethylene (PTFE) and other fluorocarbon resins. The idea of using Teflon®-coated surfaces - familiar from cookware - seemed ideal because these are both "non-stick" and hard. However, despite having low surface energy, Teflon® is actually porous and thus still allowed fouling organisms to establish a mechanical interlock. Silicone-based elastomeric coatings are an...

The technology behind silicone-based fouling release coatings and their properties is well known, but has proved difficult to This is because there are major challenges involved in getting the "non-stick" surface of a fouling release system to adhere to the anticorrosive coating applied to the hull. Up until now, this has hindered full-scale exploitation of fouling release technology, and is known as the weak point in many silicone-based fouling release systems. More than the sum of the parts Hempel has solved this by developinga new tiecoatthat combines chemical properties from the...

Simple physics The basic idea behind HEMPASIL fouling release systems makes them environmentally sound in a manner that conventional antifouling systems can never match. The antifouling effect is simply the result of the water- repellent physical properties of the surface, rather than being due to the coating exerting a chemical effect on the The biocide-free HEMPASIL specifications are a clear environmental advantage. Users are free of having to deal with the consequences of both current and future legislation This also means there are no problems of the kinds encountered with conventional...

Fuel savings Smoothness counts One of the most unique advantages of a silicone-based fouling release system is that it reduces drag when the hull passes through Any reduction in drag as a result of greater smoothness cuts down on fuel consumption. Test results from independent towing tank experiments document that HEMPASIL show a significantly lower skin friction than a reference self polishing antifouling. The improvement in skin friction compared to antifouling was up to 5%. For a large container vessel a skin friction improvement of 5% corresponds in propulsion efficiency to an...

Hempel supplies several different types of fouling release coatings, each designed to withstand the specific types of stress characteristics for different surfaces and different The HEM PASIL range include products designed for vessels that operate with high service speeds like fast aluminium ferries as well as products for vessels with a relative low speed like VLCC's and bulk carriers. The example below illustrate a typical specification with HEMPASIL 77500, a product particularly suitable for use by high-activity operators that appreciate the fuel economy benefits of an extremely smooth,...

Despite all the many advantages of HEMPASIL fouling release systems, the application procedures and requirements are fully on a par with conventional coatings. dependingon the stress to which the coating has been exposed. With a HEMPASIL topcoat solution, renewal is simple and only requires application of a new layer of HEMPASIL topcoat onto With due care, applying a silicone-based system such as HEMPASIL is just as straightforward as working with any other multi-component coating system. Smaller quantities needed Foulingrelease coatings involve usingless paint than traditional antifouling...

HEMPASIL posess an AHR of 20 micron Average Hull Roughness (AHR) is crucial for the vessel's perfomance. More power and therefore more fuel is required if AHR is increasing. AHR is being measured by the BMT gauge and such measuremetns are typically taken after the final coat has been applied. For a newbuilding vessel applied a conventional antifoulingthe AHR is typically 125-150 micron. The inherent AHR of HEMAPSIL is below 20 micron one of the reasons why an economical fuel performance can be To achieve the full benefit of HEMPASIL's very low AHR it is however, crucial thatthe surface...

Hempel worldwide Most large construction projects today involve companies from more than one country. Often, different sections are constructed in different countries before final assembly on site. Delays in the construction of any of these sections will mean costly delays for the entire construction project. This is why the rapid, efficient supply of paint is an important key to our customers’ success. The Hempel Group is a leader in the production and sales of protective coatings within the marine, container, yacht, decorative and protective market segments. Hempel is currently...

The Hempel Group Head Office E-mail: marine@dk.hempel.com