SEALER 300 W CT PHYSICAL PROPERTIES: Clear colourless liquid DESCRIPTION: SEALER 300 W CT is a water dilutable, inorganic sealing system based on silicon. SEALER 300 W CT contains no chromates in the dry film and does not produce hydrogen embrittlement into the coated material. The layer is transparent. SEALER 300 W CT is an inorganic sealing system which reacts with all our passivations on top of zinc or zinc alloys. Corrosion protection of more than 1000 hours in salt spray test according to DIN 50021-SS or ASTM B 117 without base metal corrosion can be reached. SEALER 300 W CT improves corrosion resistance according to VDA 621-415 alternating atmosphere test compared to unsealed and conventionally sealed products. SEALER 300 W CT achieves a coating thickness between 0.5 and 1 microns on rack parts. SEALER 300 W CT improves significantly corrosion protection according to condensed water containing climate DIN 50017 and out door exposure (weathering). SEALER 300 W CT increases temperature resistance up to 200 C depending on use. J. Unger Rev 1.3 12.08.2005 1/6
DELIVERY CONDITIONS: Density 1.12 1.15 g/cm³ Solid content 22 24 % ph value 10.5 11.5 Theoretical coverage rate Stability 150 300 m²/kg at 0.5-1 µm coating thickness depending on concentrate and drag out. 6 months in original sealed drums at 20 C. Frost-free storage recommended. APPLICATION METHODS FOR RACK PARTS: Make-up 14 % 13.5 20.0 % Dip time 60 s 60 120 s Temperature 55 C 50 60 C Thinner Demineralised water, conductivity max. 20 µs ph value 10.8 10.0 11.5 ph value cannot be increased by alkalines because accumulated foreign ions will lead to lower corrosion protection. ph value should be adjusted by partial new make-up from sealer concentrate. EQUIPMENT: Filtration Circulation Heaters Movement 5 10 µm filter approx. 1 x per hour Necessary Not necessary, avoid air blowing J. Unger Rev 1.3 12.08.2005 2/6
Dosage Hang over time Fade equipment Depending on cycles, according to drag in and drag out. Concentrate should be determined by analysis of solid content. 30-90 s for rack parts Depending on parts and requirements RINSING Optimum rinsing maintaining constant quality of sealer requires a rinse criterion of 1000 between passivation and sealer. After passivation 2 or 3 flow rinses should be used before racks are dipped into sealing tank with. A spray rinse as final rinsing also avoids drag out and passivation components affecting corrosion protection of the sealing. BATH CONTROL / CONCENTRATE Solid content can be determined following details on page 6 or according to DIN EN ISO 3251 or DIN 53216. A quick and easy determination can also be made with the "Festkörperwaage Mettler Toledo HB 43" (Halogen Moisture Analyzer). The sealer concentrate should be checked regularly and amount to 13.5 % minimum as a lower concentrate will lead to lower corrosion protection. To increase sealer concentrate by 1 % add 10 ml/l SEALER 300 W CT. Ion concentrate of chrome(iii) should not exceed 200 mg/l. Analysis of chrome content can be made by atomic absorption spectroscopy. J. Unger Rev 1.3 12.08.2005 3/6
CORROSION PROTECTION: 1000 900 800 700 Beginn Start Base Grundmetallkorrosion Metal Corrosion Start Beginn Zinc Zinkkorrosion Corrosion 600-900h 700-1000h 600 500 400-600h 400 300 200 100 120-240h 140-240h 160-300h 0 Zink Zink-Eisen Zink-Nickel Zinc Zinc-Iron Zinc-Nickel + Passivierung Passivierung + Passivierung + + Passivation Sealer Passivation Passivation CURING CONDITIONS: Air circulated Box Oven 25 min at 50 C object temperature 18 min at 60 C object temperature 10 min at 120 C object temperature 8 min at 160 C object temperature Object temperature should be controlled by oven curves with data log. WASTE DISPOSAL: Liquid should be further diluted before discharge to meet local authority laws. SAFETY PRECAUTIONS: See Material Safety Data Sheet GUARANTEE: Above instructions and recommendations are the results of intensive testing and shop experiences. They are for your information, only. Our guarantee extends to the continuous quality of our products as they leave our factory and not to their usage in the field which is a factor beyond the control of a supplier. J. Unger Rev 1.3 12.08.2005 4/6
TROUBLESHOOTING: PROBLEM CAUSES CORRECTIONS Excessive drying deposits Insufficient corrosion protection Heterogeneous or matt sealer surface Concentrate too high Temperature of sealer too high Unfavorable hanging position of parts Insufficient fade equipment Concentrate too low Temperature too low Contamination of sealer Low ph value (nominal > 9.5) by drag out of passivation Dip/hang over time too short Fade equipment too strong Incorrect passivation Poor quality drying Precipitation of sealer by ph displacement due to insufficient rinsing High drag in of passivation Adjust concentrate Reduce temperature Adjust hanger to parts size Improve fade equipment Adjust concentrate (to 13.5 % min.) Increase temperature Analyse foreign metal Improve rinsing and raise ph by partial new make-up Extend dip/hang over time Reduce fade pression Adjust passivation Check object temperature and increase drying temperature and time Improve rinsing and raise ph by partial new make-up Improve rinsing J. Unger Rev 1.3 12.08.2005 5/6
DETERMINATION OF SOLID CONTENT OF SEALER 300 W CT Description of Test Method: At all times a double weight determination has to be done. The determination of the solid content of the has to be done at a temperature of 180 C for 30 minutes in an oven. Required Equipment: Analytical balance 0.001 g sensitivity Oven to work at 180 C Petri capsule 20 cm² surface, approx. 50 mm diameter Desiccator Test Method: Adjust the balance to zero. Check the weight of the Petri capsule. Weigh an amount of 1 5 g of onto the Petri capsule. (The value of the weight should be determined with accuracy.) Put the Petri capsule with the directly into the oven at 180 C for 30 minutes. Transfer the capsule to the desiccator and let it cool down until it reaches 20 25 C. Weigh the capsule with the dry extract correctly. Calculation: % Sealer = Factor = 4,3 Weight of extract of Weight of x 100 x Factor J. Unger Rev 1.3 12.08.2005 6/6