ABchimie™ AVR80 BA

• Excellent adhesion under all climatic conditions,
• Fluoresces under UV light as an aid to inspection,
• Wide temperature range -65°C to +150°C,
• Can be soldered through without fear of highly toxic gasses being produced (contains no isocyanates),
• Resistant to mold growth,
• Can be totally removed with ABchimie SND or DNS,
• Compatible with other high specification acrylic coatings,
• Excellent Dielectric properties,
• UL94V0 approval. (File E308681),
• NF EN 61086-2 Approval,
• NF EN 45545, NF EN 16101, NF EN 16102 Approvals,
• Meets IPC-CC-830 and MIL-I-46058C,
• Halogen free.

AVR80 BA can be sprayed, dipped or brushed. The thickness of the coating depends on the method of application, but a dip coater normally deposits a film thickness of about 25 microns (single coat). Workshop temperatures of less than 16°C or relative humidities in excess of 75% are unsuitable for the application of AVR80 BA. AVR80 BA contains a UV trace which allows inspection of the PCB after coating to ensure complete and even coverage. The stonger the reflected light, the thicker the coating layer is. Before coating, PCBAs should be clean, dry and without moisture. The CI, being composite materials, absorb moisture. It is important to remove it before coating. A passage in oven for 3 to 4 hours at 60°C is generally sufficient. After a soldering process, PCBAs can be coat immediately. If there is an intermediate storage up to 48 hours you will have to dry PCBAs. Homogenization of AVR80 BA is necessary before use. also be observed in the varnish AVR80 BA, then just mix the varnish before use.
Cleaning
AVR80 BA can be applied on uncleaned PCBAs. A cross cut test may to do to check the good adhesion on the PCBAs. Cleaning will increase adhesion on the substrat. ABchimie manufacture a range of 100% Ozone Friendly cleaning products in both the hydrocarbon solvent and aqueous fields. All products produce results within the Military specification (<1.56mg NaCL/cm2). Please contact ABchimie for further information.
Dip Coating
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. Acrylic Thinners (DVA BA) should be used to keep the AVR80 BA coating at a suitable viscosity for dipping. DVA BA is added periodically as the solvent evaporates. The viscosity should be checked using a viscosity meter or "flow cup" (Zahn 2). The board assemblies should be immersed in the AVR80 BA 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. ABchimie Peelable Coating Mask (LDM) 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 (5 to 20 cm/mn) 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. After the draining operation is complete, the boards should be placed in an air-circulating drying cabinet and left to dry.
Spraying
Bulk AVR80 BA needs to be thinned with DVA BA R before spraying. The optimum viscosity to give coating quality and thickness depends on the spray equipment and conditions but a starting point could be 1 parts coating to 1 part thinners. If bulk coating material has been agitated, allow to stand until air bubbles have dispersed. AVR80 BA 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. The nozzle of the spray gun requires to be selected to give an even spray to suit the prevailing viscosity of the coating material. 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.
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 (silk) so as not to leave brush marks and so that the components and wiring are not disturbed. When the brushing operation is complete the boards should be placed in an air-circulating drying cabinet and left to dry.
Double Coating
Two coats of AVR80 BA are not usually required. However if two coats are required, the second coating should be applied after the first coating is dry. This will ensure that the two coats will bond satisfactorily.

AVR80 BA DS65 : For dispensing machine (viscosity at 65 cSt @25°C)
AVR80 BA DS83 : For dispensing machine (viscosity at 83 cSt @25°C)
AVR80 BA DS: Viscosity adapted at the customer needs
AVR80 BA 4060/4555/5050 : High viscosity versions
AVR80 BA GEL : Gel