Page 1 DCA Modified Silicone Conformal Coating (SCC3) DCA is a flexible, transparent and unique modified silicone conformal coating specifically designed for the protection of electronic circuitry. It has been formulated to meet the highest defence standards in both Europe and the United States. It holds approvals including the British Ministry of Defence (MOD) DEF-STAN 59/47 Issue 4, and Underwriters Laboratories UL746C-QMJU2. Can be cured at ambient or elevated temperatures optimum properties achieved by heat curing Heat-cured coating is resistant to many solvents used within aerospace and automotive industries Suitable for use at temperature extremes very wide operating temperature range Can be reworked using specialist removal product, Electrolube CCRG Approvals RoHS-2 Compliant (2011/65/EU): Yes UL746C-QMJU2: Approved File Number: E138403 DEF-STAN 59/47 (Issue 4): Yes IPC-CC-830: Meets approval NATO Stock Numbers: 6850996642823 (DCA05L) 6850992530057 (DCA200H) Liquid Properties Appearance: Clear Pale Straw Density 20C (g/ml): 0.97 (Bulk), 0.78 (Aerosol) VOC Content: 63% (Bulk) 73% (Aerosol) Flash Point: 27C (Bulk), <23C (Aerosol) Solids content: 37% (Bulk), 27% (Aerosol) Viscosity 20C (mPa s): 180 - 250 (Bulk) Touch Dry: 50 - 55 minutes Recommended Curing Schedule*: 2 Hours 20C followed by: 2 - 24 Hours 90C to 120C *(Maximum Solvent Resistance Achieved 120C Ambient Curing Schedule: 24 Hours 20-25C) Coverage 25 m: 14.8m per litre (Bulk), 2.16m (200ml Aerosol) Cured Film Coating Colour: Colourless Operating Temperature Range: -70C to +200C Flammability: UL94 V-1 Thermal Cycling (IPC-CC-830): Meets approval Coefficient of Expansion: 90ppm Dielectric Strength: 90 kV/mm Dielectric Constant: 3.95 1 MHz 15 Insulation Resistance: 1 x 10 Ohm (DEF-STAN 59/47) Dissipation Factor ( 1 MHz, 25C): 0.037 Moisture Resistance (IPC-CC-830): Meets approval Page 2 Description Packaging Order Code Shelf Life DCA Conformal Coating 200ml Aerosol DCA200ML 36 Months 1 Litre Bulk DCA01L 48 Months 5 Litre Bulk DCA05L 48 Months Conformal Coating Thinners 1 Litre DCT01L 36 Months 5 Litre Bulk DCT05L 36 Months 1 Litre Bulk CCRG01L 36 Months Conformal Coating Removal Gel Directions for Use DCA can be sprayed, dipped or brushed. The thickness of the coating depends on the method of application (typically 25-75 microns). Temperatures of less than 16C or relative humidity in excess of 75% are unsuitable for the application of DCA. As is the case for all solvent based conformal coatings, adequate extraction should be used (refer to MSDS for further information). Substrates should be thoroughly cleaned before coating. This is required to ensure that satisfactory adhesion to the substrate is achieved. Also, all flux residues must be removed as they may become corrosive if left on the PCB. Electrolube manufacture a range of cleaning products using both hydrocarbon solvent and aqueous technology. Electrolube cleaning products produce results within Military specification. Spraying Bulk DCA needs to be diluted with the appropriate thinners (DCT) before spraying. The optimum viscosity to give coating quality and thickness depends on the spray equipment and conditions, but normally a dilution ratio of 2:1 (DCA:DCT) is required. Suitable spray viscosity is typically 50-80mPa s. If bulk coating material has been agitated, allow to stand until air bubbles have dispersed. DCA is suitable both for use in manual spray guns and selective coating equipment. The selected nozzle should enable a suitable even spray to be applied in addition to suiting the prevailing viscosity. The normal spray gun pressure required is 274 to 413 kPa (40 - 60 lbs/sq.inch). After spraying, the boards should be placed in an air-circulating drying cabinet following the curing schedule highlighted on page 4/5.