Lutron KS 1. Technical Information

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1 Technical Information Lutron KS 1 TI/ES 1158 e May 2000 (DFC) Supersedes edition dated September 1992 = Registered trademark of BASF Aktiengesellschaft Ingredient of fluxes used in the production of printed circuit boards Component of brightener additives for the electroplating industry Heat-transfer fluid

2 Lutron KS 1 Chemical nature Modified polyglycol ether Properties Physical form Clear, colourless or yellowish liquid Water content < 0.5% (DIN 51777, Part 1, ASTM D 1744) Density (DIN 51757, g/cm 3 ASTM D 1298, 23 C) Viscosity mm 2 /s (DIN 51562, Part 1, ASTM D 445, 23 C) Flash point > 300 C (ISO 2592, ASTM D 92) Pour point approx. 17 C (ISO 3016) Ignition temperature approx. 415 C (DIN 51794) The above information is correct at the time of going to press. It does not necessarily form part of the product specification. A detailed product specification is available from your local BASF representative. Solubility Storage Lutron KS 1 is miscible with water in all proportions. It is nonionic, and is therefore not affected by water hardness. Lutron KS 1 has a shelf life of at least two years in its sealed, original packaging. It can gradually darken in colour over long periods in storage, but this has no effect on its performance. Its viscosity is low enough to allow it to be pumped at temperatures down to around 10 C. It can become cloudy if it is stored at low temperatures, but this cloudiness can be dissipated by gentle heating before it is decanted. Lutron KS 1 is slightly hygroscopic, and so it should always be stored in tightly sealed containers. 3

3 Physical properties The figures below were obtained for one single representative batch. They are not tested on a regular basis. Temperature Density Specific heat Kinematic Thermal viscosity conductivity* (DIN 51757) (DIN 51007) (DIN 51562) C g/cm 3 kj/(kg K) mm 2 /s W/(m K) * BASF concentric sphere method Thermal stability No exothermic processes take place when Lutron KS 1 is heated from room temperature. Differential thermal analysis has shown that Lutron KS 1 continues to absorb energy until the temperature reaches approx. 250 C. Residue (%) N 2 Air Thermogravimetric analysis of Lutron KS Temperature ( C) The loss in weight can be reduced by heating Lutron KS 1 in an inert atmosphere. The loss in weight is due to volatile decomposition products being liberated, which are mainly responsible for the vapour pressure of 3 x 10-2 mbar measured after 10 hours at 200 C (gas saturation method SOP 04/01). A higher figure for the vapour pressure is obtained initially, which is due to the evaporation of the residual water. 4

4 Behaviour at elevated temperatures In many applications, it is necessary to go to the very limits of Lutron KS 1 s thermal stability. Lutron KS 1 takes on a dark coloration fairly quickly at temperatures above 150 C, but this has no effect on its performance as a heat-transfer fluid. The working life of the bath can be prolonged by preventing the fluid from coming into contact with air, provided this is technically feasible. Air can be excluded by blanketing the liquid with an inert gas, and antioxidants can be added. Lutron KS 1 normally has a low viscosity, even after long periods at elevated temperatures. If Lutron KS 1 does decompose, it does not normally form any hard deposits or sludge. Tools and equipment can simply be cleaned with water. Decomposition products Volatile decomposition products are released if Lutron KS 1 is heated strongly in air. Care must be taken to ensure that the workplace is well ventilated. Glycol esters and acetals are released alongside water vapour, carbon dioxide and glycols when Lutron KS 1 is heated to 200 C in a stream of air. A pungent odour can be caused by the liberation of volatile aldehydes such as formaldehyde, acetaldehyde and acrolein at concentrations in the order of a few ppm. Corrosion Lutron KS 1 is not very corrosive to ferrous metals, even after prolonged periods at elevated temperatures. It can be made alkaline by adding triethanolamine, which reduces corrosion even further. The corrosive effects of Lutron KS 1 on other combinations of metals need to be assessed in individual tests. The compatibility of Lutron KS 1 with paints and plastics also has to be verified by testing. Applications Lutron KS 1 is used as a lubricant and heat-transfer fluid in the metalworking industry, in plastics processing, in the textile industry, and in the production of printed circuit boards. It has the following special features. It is miscible in all proportions with water. Mixtures of Lutron KS 1 and water do not foam. It has a high flash point and it is stable at high temperatures. It can be used at temperatures of up to approx. 200 C in long-term, heattransfer applications, and at up to approx. 270 C as a soldering flux. It does not form any sludge or incrustation, even over long periods. The Lutron types are miscible with each other, and they are compatible with all conventional nonionic surfactants. Lutron KS 1 combines a very low viscosity with excellent thermal stability. It is an effective, low-viscosity alternative to Lutron HF 3. Printed circuit boards Metalworking Electroplating Lutron KS 1 is used in the production of printed circuit boards in formulations for fluxes for use in hot-air and hot-oil levelling processes, and for reflow fluids. Formulations consist of water, stabilizers, activators, organic solvents and other additives alongside Lutron KS 1. Lutron KS 1 s high solubility and thermal stability make it an effective ingredient of cutting oils, and other metalworking fluids. It can also be used as a heat-transfer fluid for melting low-melting alloys. Lutron KS 1 is used in the electroplating industry as a basic brightener for acid zinc, tin and copper electrolytes. 5

5 Plastics processing Lutron KS 1 can be used as a heat-transfer fluid for melting cores made from low-melting metal alloys. Cores can be melted out of mouldings by electrical induction or by conventional heating. Lutron KS 1 has excellent thermal stability. It is used whenever heat-transfer fluids are expected to remain stable for long periods at temperatures of up to approx. 200 C. It is an ideal companion for Lutron HF 1. Lutron KS 1 protects the metal from oxidation when it is melted. It has a long working life, provided very high peaks in temperature and local anomalies of temperature in the bath are avoided. Its viscosity can gradually increase over time under unfavourable circumstances, but the main factor limiting its working life is the ease with which it can be washed off from mouldings. It can be rinsed off from mouldings with water alone, and no other additives are required. It is sometimes possible to recycle spent Lutron KS 1 by distilling it from the rinse water, but this has to be tested in trials. Textiles Lutron KS 1 is used to formulate spin finishes and other processing auxiliaries, especially Lubricants Winding oils Softening agents. It is a very effective lubricant, and it is stable at high temperatures. Safety We know of no ill effects that could have resulted from using Lutron KS 1 for the purpose for which it is intended and from processing it in accordance with current practice. According to the experience we have gained over many years and other information at our disposal, Lutron KS 1 does not exert any harmful effects on health, provided that it is used properly, due attention is given to the precautions necessary for handling chemicals, and the information and advice given in our safety data sheets are observed. No exothermic processes take place when Lutron KS 1 is heated to temperatures of up to 350 C, but its ignition temperature can be lower if it is present in the form of very finely divided droplets (such as on insulating material). Disposal Lutron KS 1 can be disposed of by special treatment, such as incineration in an approved facility, subject to local authority regulations. Note The information submitted in this publication is based on our current knowledge and experience. In view of the many factors that may affect processing and application, these data do not relieve processors of the responsibility of carrying out their own tests and experiments; neither do they imply any legally binding assurance of certain properties or of suitability for a specific purpose. It is the responsibility of those to whom we supply our products to ensure that any proprietary rights and existing laws and legislation are observed. 6

6 BASF Aktiengesellschaft Marketing Spezialchemikalien I Ludwigshafen, Germany Printed in Germany