Eurailmag - #15 - March 2007 - (Page 34)

Coatings The products which are available at the present time are quite different PROPERTIES OF PERMANENT PRESERVATION AGENTS Property Binding agent basis Hardening Solids content Pretreatment Wettability of the surfaces to be coated Wettability of the product Achievable dry film thickness Drying time until bringing into service Time until full loadability Can be coated with same coating Can be refreshed and/or renewed with same coating Adherence of pictograms Resistance to weathering Resistance to graffiti removal agent Resistance to cleaning agent Resistance to vehicle washing systems (with brushes) Removability of spray lacquer graffiti Removability of "permanent marker" and ink without "shadows" Tendency to dirtying about 15 min at permanent exposure Given with "permanent marker"; with ink, some shadows remain Significantly less than with lacquer < 15 % Cleaning + degreasing; application of a primer Given, with primer Roll-off effect Products for interior + exterior Products for interior + exterior Prepolymers of cylosilanes, alkoxysilanes, silazanes, siloxane hybrids Air humidity hardening under separation of alcohols and, with some products, ammonia as well < 30% for exterior and interior; <70% for interior Cleaning + degreasing Given, in general Roll-off effect 8hrs. Given, exposure time 8 hrs.; concentrations 1:1, 1:5 and 1:10 about 30 min at permanent exposure Up to approx. 10 min; after further 8 hrs. drying possible without limitation Possible after cleaning Given, after cleaning < 90% Cleaning + degreasing Not on all surfaces No roll-off effect Products for interior Removal possible at least 10 times without leaving remains and causing lacquer damage Given Less than with lacquer Given Somewhat less than with lacquer The following is to be observed during the application of permanent preservatives: • A flaw-free application is difficult as the coated and uncoated surfaces are difficult to distinguish from each other. • A control of the desired layer thickness is not possible. • In the case of products with a high solids content, there is the danger of thicker layers, which then form cracks when dry. • The products must be processed without delay after removal from the storage container. Otherwise, polycondensation and thickening take place through reaction with air humidity. The coats applied can then be irregular and mat. • The surfaces must be tested for suitability for coating with the preservation agents. This applies especially to new lacquer. Lacquer aged through weathering and cleaning can generally be coated well after thorough cleaning. Coated surfaces can be tested for compatibility with preservation agents by coating them with the corresponding agent and then with alternating condensate impacts. No bubbles, pores or cracks may appear. The long lifetime of the coating with permanent preservatives can be estimated as 4 to 5 years at the present time. It is important that no abrasive agents be used when cleaning and when removing graffiti and smears. Permanent preservation agents are presently used by the Deutsche Bahn with the redesign of the ICE1 and with different vehicles for local transport © DB AG A little light can make a big difference. If you are having costly and troublesome problems removing graffiti from railway cars, trucks, architectural glass or the sides of buildings, consider what the power of photons and a little light can do for you. When you use UV curing systems from Fusion UV Systems, you’ll discover that most graffiti can be cleaned repeatedly using the power of light.™ For more information on this solvent-free solution and how it can solve graffiti problems in your operation, contact Fusion UV Systems at www.fusionuv.com. ® ® Incredible functionality. Unlimited potential. SM Phone 301 527 2660 910 Clopper Road Gaithersburg, MD 20878-1357 USA Issue 15 EURAILmag Business & Technology http://www.fusionuv.com http://www.fusionuv.com

Table of Contents for the Digital Edition of Eurailmag - #15 - March 2007

SOMMAIRE
NOTICE BOARD
COATINGS
NEWS
SERVICES
INFRASTRUCTURE
HIGH-SPEED LINES
TUNNELS
PEOPLE
ROLLING STOCK
WEBSITE DIRECTORY

Eurailmag - #15 - March 2007

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