page: 1 of 4 safety data sheet print date: 22/02/1999 ref: src-bulk 1. identification of the substance/preparation and the company/undertaking silicone removeable coating product name: product code: src-bulk supplier: electrolube h.k. wentworth ltd., wentworth house, blakes road, wargrave, berkshire, rg10 8aw, united kingdom. fax no: 0118 9403084 emergency telephone number: 0118 9404031 2. composition/information on ingredients identification of the preparation chemical name cas-no ec-no class weight % xylene, mixture of isomers 1330-20-7 215-535-7 r10 xn; r20/21 xi; r38 > 30 non hazardous constituents > 30 3. hazards identification most important hazards: flammable and harmful specific hazards harmful by inhalation and in contact with skin. irritating to eyes and skin. in higher concentrations, xylene is irritating to eyes and the respiratory tract, causes drowsiness and may cause central- nervous effects (headache etc.). prolonged exposure - liver and kidney injuries may occur. 4. first aid measures general advice: remove from exposure, lie down. inhalation: move to fresh air in case of accidental inhalation of vapours. skin contact: remove immediately adhering matter. eye contact: rinse immediately with plenty of water, also under the eyelids, for at least 15 minutes. if eye irritation persists, consult a specialist. ingestion: immediately give large quantities of water to drink. consult a physician if necessary. 5. fire-fighting measures suitable extinguishing media: extinguish with carbon dioxide, dry chemical, foam or waterspray. extinguishing media which must not be used for safety reasons: do not use a solid water stream as it may scatter and spread fire. specific hazards: highly flammable. cool containers / tanks with spray water. special protective equipment for firefighters: in the event of fire, wear self-contained breathing apparatus. specific methods: standard procedure for chemical fires. 6. accidental release measures personal precautions: use personal protective equipment. environmental precautions: do not flush into surface water or sanitary sewer system.
2 of 4 page: silicone removeable coating product name: 22/02/1999 print date: src-bulk ref: methods for cleaning up: soak up with inert absorbent material. shovel into suitable container for disposal. 7. handling and storage handling: use only in area provided with appropriate exhaust ventilation. avoid contact with the skin and the eyes. do not breath vapours or spray mist. when using, do not eat, drink or smoke. storage: keep away from heat and sources of ignition. keep in a cool, well-ventilated place store in a cool and shaded area. 8. exposure controls / personal protection chemical name: national occupational exposure limits: hsc(eh40) xylene, mixture of isomers long term (8 hrs) = 100ppm / 441mgm -3 short term (15 min) = 150ppm / 662mgm -3 non hazardous constituents engineering measures: provide adequate ventilation. personal protection equipment: - respiratory protection: when workers are facing concentrations above the exposure limit they must use appropriate certified respirators. - hand protection: prolonged exposure - solvent-resistant gloves (butylrubber) - eye protection: goggles / safety glasses with side-shields - skin and body protection: not required under normal use. hygiene measures: wash hands before breaks and immediately after handling the product. when using, do not eat, drink or smoke. 9. physical and chemical properties form: liquid * as xylene colour: clear colourless odour: benzene boiling point/range: n/d c melting point/range: n/d c flash point: * 27 c autoignition temperature: * 465 c explosion limits: - lower * 1.1 vol. % - upper * 7 vol. % vapour pressure: ( 30 c) * 10 hpa relative density: ( 20 c) >= 0.844 bulk density: 844 kg/m3 solubility: water solubility immiscible (g/l) viscosity: ( 20 c) 1.6 -2.0 mpa.s 10. stability and reactivity stability: stable under recommended storage conditions. conditions to avoid: keep away from sources of ignition, strong oxidizing agents. materials to avoid: strong oxidizing agents hazardous decomposition products: no decomposition if stored and applied as directed. 11. toxicological information acute toxicity: ld50/oral/rat = 4.3g/kg
page: 3 of 4 silicone removeable coating product name: print date: 22/02/1999 src-bulk ref: local effects: may cause eye or skin irritation with susceptible persons sensitization: may cause sensitization by skin contact in higher concentrations, xylene is irritating to eyes and the respiratory tract, causes drowsiness and may cause central- nervous effects (headache etc.) long term toxicity: chronic toxicity: effects of excessive exposures may include liver toxicity 12. ecological information mobility: persistence and degradability: according to the results of tests of biodegradability this product is not readily biodegradable. bioaccumulation: no data is available on the product itself. ecotoxicity effects: toxic to aquatic organisms. xylene lc50/96h/rainbow trout = 2.6-8.4 mg/l 13. disposal considerations waste from residues / unused products: in accordance with local and national regulations contaminated packaging: can be incinerated, when in compliance with the environment protection act 1990 (process guidance note ipr5/1). do not dispose of waste into sewer. 14. transport information un-no: 1263 marine pollutant: no adr/rid class: 3 item: 3o (b) hi/un no: 1263 proper shipping name: paint imo class: 3.2 imdg page: 3268 ems: 3-05 mfag: 310 proper shipping name: paint icao class: 3 un/id no: 1263 proper shipping name paint 15. regulatory information classification according to european directive on classification of hazardous preparations 90/492/eec - contains: xylene - symbol(s): xn - harmful r-phrase(s): r10 - flammable.. r20/21 - harmful by inhalation and in contact with skin. r38 - irritating to skin. s-phrase(s): - keep in a cool, well-ventilated place. s16 - keep away from sources of ignition - no smoking. s25 - avoid contact with eyes.. s33 - take precautionary measures against static discharges.. 16. other information recommended use:
page: 4 of 4 silicone removeable coating product name: print date: 22/02/1999 src-bulk ref: recommended restrictions: 2 revision number: further information: cn no 32089010 contact name: carolyn booth department: technical the information provided in this safety data sheet is correct to the best of our knowledge, information and belief at the date of its publication the information given is designed only as a guidance for safe handling, use, processing, storage, transportation, disposal and release and is not to be considered a warranty or quality specification the information relates only to the specific material designated and may not be valid for such material used in combination with any other materials or in any process unless specified in the text
technical data sheet electrolube wentworth house, blakes road, wargrave, berkshire, rg10 8aw, uk telephone: +44(0) 118 940 4031/ 3014 fax: +44(0) 118 940 3084 iso 9002 registered firm. certificate no. fm 32082 product description: silicone removable coating date: 03/97 product code: src pages: 2 product description src is a silicone conformal coating designed to protect printed circuit boards exposed to high humidity environments. the coating is specially formulated to be easily removed with most common solvents. electrolube ultrasolve (uls) is ideal. src in bulk may be applied by spraying, dipping or brushing. thinners are available to maintain the viscos- ity of the coating. a uv trace is included within the coating to allow easy and reliable post-coating inspection. the stronger the reflected light, the thicker the coating layer. characteristics * good adhesion under high humidity conditions. * low oxygen permitivity and excellent su rface resistivity. * excellent resistance to mould growth, tropical conditions and ultraviolet light. * good operating temperature range. * good dielectric properties, coating thickness typically being 25 microns. * repairability - easily soldered through without fear of highly toxic gases being produced or totally removed with ultrasolve. application src can be sprayed, dipped or brushed. the thickness of the coating depends on the method of appli- cation, but a dip coater normally deposits a film thickness of about 25 microns (single coat). workshop temperatures of less than 16c or relative humidities in excess of 75% are unsuitable for the application of src . all pcbs, being composite materials, absorb moisture. if this is not removed, the conformal coating may not protect to the required extent. pre-drying or vacuum desiccation, will remove the moisture. cleaning boards should be thoroughly cleaned before coating. this is required to ensure that satisfactory adhesion to the substrate is possible. also all flux residues must be removed as they may become corrosive if left on the pcb. electrolube manufacture a range of 100% ozone friendly cleaning products. all products produce results within the military specification. please contact electrolube for further information. dip coating electrolube manufacture an automated dip coating machine (dcm) which is ideal for applying all of the electrolube conformal coatings including src . ensure that the coating material in the container has been agitated thoroughly and has been allowed to stand for at least 2 hours for all the air bubbles to disperse. src thinners (dct) should be used to keep the src coating at a suitable viscosity for dipping. dct is added periodically as the solvent evaporates. the viscosity should be checked using a viscosity meter or "flow cup". the board assemblies should be immersed in the src dipping tank in the vertical position, or at an angle as close to the vertical as possible. connectors should not be immersed in the liquid unless they are very carefully masked. electrolube peelable coating mask (pcm) is ideal for this application. leave submerged for about 1 minute until the air bubbles have dispersed. the board or boards should then be withdrawn very slowly so that an even film covers the surface. after withdrawing, the boards should be left to drain over the tank until the majority of residual coating has left the surface. cont?d...2
src - 2 - spraying bulk src needs to be thinned with src thinners (dct) before spraying. the optimum viscosity to give coating quality and thickness depends on the spray equipment and conditions but a starting point could be 2 parts coating to 1 part thinners. if bulk coating material has been agitated, allow to stand until air bubbles have dispersed. the nozzle of the spray gun requires to be selected to give an even spray to suit the viscosity of the coating material. src is suitable both for use in manual spray guns and computer controlled airless spray equipment that only coats the required areas of the pcb, eliminating the need for masking. to ensure penetration of the coating beneath the components and in confined spaces, spray the assembly from all directions to give an even coating. after spraying, the boards should be placed in an air-circulating drying cabinet and left to dry for 2 hours at room temperature prior to any heat curing. brushing ensure that the coating material has been agitated thoroughly and has been allowed to settle for at least 2 hours. the coating should be kept at ambient temperature. gently apply the coating with a good quality brush so as not to leave brush marks and so that the components and wiring are not disturbed. drying times and curing conditions src will dry in air within 4 to 12 hours at room temperature. this cure time can be reduced by the use of moderate heat. the coating should be tack free within 20 minutes. any heat cure must be started after the coating has become tack free. typical properties colour: clear translucent fluid non-volatile content: 33% approx. viscosity at 25c : 45 mpa.s surface resistivity (ohms) : 2.2x10 11 specific gravity at 25c: 1.03 flash point 20c temperature range: -50c to +125c packaging order code 400ml aerosol src400 5 litre bulk src05l thinners 5 litre bulk dct05l copyright electrolube 1997 all information is given in good faith but without warranty. properties are given as a guide only and should not be taken as a specification. electrolube cannot be held responsible for the performance of its products within any application determined by the customer, who must satisfy themselves as to the suitability of the product.
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