Feature
Conformal coating is a protective coating or polymer film that ‘conforms’ to the circuit board topology. Its purpose is to protect electronic circuits from harsh environments that may contain high humidity, a range of airborne contaminants and varying temperatures. By being electrically insulating, it maintains long-term surface insulation resistance (SIR) levels and thus ensures the operational integrity of the assembly. It also provides a barrier to air-borne contaminants from the operating environment, such as salt-spray, thus preventing corrosion.
The concept of a conformal coating of electronics was originally proposed and developed through research to meet the demanding requirements of the military decades earlier and now this technology has expanded to an array of industries including:
．Aerospace
．Automotive
．Industrial Controls
．White Goods
．Telecoms
．Energy both Traditional and Renewable
Specification
．Conformal Coating
| Type |
Item No. | Feature | Application |
| Acrylic series | 1B31, 1B31LTX, 1B73, 1R32A-2 | Acrylic base is a fast drying, single component, acrylic conformal coating intended for use on PCB assemblies. | Easy to apply and remove, with a wide process window for use. Acrylic coatings dry rapidly, are fungus resistant and provide long pot life. Additionally, acrylic materials produce little or no heat during the curing process, eliminating potential damage to heat sensitive components. The coatings possess low shrinkage, provide significant humidity resistance and exhibit low glass transition temperatures. |
| Urethane series | 1A27, 1A27LTX, 1A33, 1A33LTX, 1A33LOS | Excellent humidity resistance and far greater chemical resistance than acrylic coatings. Single component polyurethanes, while easy-to-apply and enjoy long pot life. | Removing a polyurethane coating can be difficult due to its a very high resistance to solvents. For single-component urethanes, the preferred method of removal is by using a burn through (solder iron or other) technique. Specially formulated strippers could also to completely remove the coating from an entire PCB assembly for more wide-ranging rework. These products do not necessarily represent our complete urethane range. |
| UV Curable series | UV40, UV40-250, UV40 LED, UV50LV, UV500 | Fast curing, allows for short cycle times and maximum production speeds. These products can be sprayed using traditional automated spray equipment with the relatively simple addition of a small-footprint UV light curing unit. | -100% solids, with minimal environmental impact - Superb adhesion to a wide range of commonly used solder resists - High IR (insulation resistance) and MIR (moisture insulation resistance) - Resistance to a wide range of solvents - Great flexibility at a wide range of temperatures - Secondary moisture cure mechanism for shadowed areas |
| Synthetic Rubber series | 1B51NSLU, 1B58LU, 1B59LU | -excellent moisture and environmental protection -extremely low moisture vapor permeability -excellent flexibility, enabling low stress on components | Synthetic Rubber products are unique formulations that may enable the user to achieve specific protection / environmental goals not offered by “traditional” coatings. Synthetic Rubber materials are characterized by extremely low glass transition temperatures, resulting in stable modulus over a wide temperature range and extreme flexibility. Synthetic Rubbers have the least moisture permeability of all resins currently available. These products do not necessarily represent our complete Synthetic Rubber range. |
| Silicone series | 1C49, 1C51, 1C55 | silicone based, fluoresces under UV light, thermal cure, single component, high solids, no VOCs or solvent, low toxicity, excellent environmental resistance and moisture resistance. | Silicone conformal coatings are most widely used in high-temperature environments due to their innate ability to withstand prolonged exposure to higher temperatures than most other conformal coating chemistries. This attribute has made them the primary choice for under hood automotive applications. They are also capable of being applied in thicker films making them useful as a vibration dampening/isolation tool if the coated assembly is to be placed in a high vibration environment. |
| Aerosol (spray can) | 1B73 Aerosol, 1A33 Aerosol, 1B31 Aerosol. | aerosol products are fast drying, clear coatings available in convenient aerosol cans. Solvent and water based products are available. | Conformal coatings can be successfully applied to substrates that have been cleaned prior to coating and also to substrates assembled with low residue “no clean” materials. Users should perform adequate testing to confirm compatibility between the conformal coating and their particular assembly materials, process conditions and cleanliness level. |
．Thinner
| Item No. |
Feature | Application |
| Thinner 73 | Compatible with HumiSeal 1B73 RoHS directive 2015/863/EU | Add Thinner to a compatible coating until the desired viscosity is obtained. |
| Thinner 789 | Thinner 789 has been especially developed as a diluent for solvent based conformal coating products. | It is suitable for use with certain Acrylic, Polyurethane and Synthetic Rubber products Compatible with China GB30981-2020. |
| Thinner 521 | Thinner 521 is specially formulated to maintain the original system balance when added to the correct coating type. | Add thinner to a compatible coating until the desired viscosity is obtained. |
| Thinner 600 or 604 | When necessary, the viscosity of HumiSeal® coatings may be adjusted for application purposes, using a compatible thinner from the table below. HumiSeal® Thinners are blends of solvents formulated to maintain and preserve the original system benefits. | Add thinner to a compatible coating until the desired viscosity is obtained. |
* PCBA stands for Printed Circuit Board Assembly.
．Stripper
| Item No. |
Feature | Application |
| Stripper 1063 | -it strips all HumiSeal urethane and water-based coatings. safe for use on printed circuit board assemblies. | HumiSeal® Stripper 1063 dissolves cured HumiSeal® urethane coatings or HumiSeal® water-based acrylic coatings, without negatively affecting printed wiring board substrates or components. |
| Stripper 1080 | -compatible with all HumiSeal acrylic coatings. -safe for use on printed circuit board assemblies. -no ozone depleting chemicals. | HumiSeal® Stripper 1080 can be used to remove cured HumiSeal® acrylic coatings without negatively affecting printed wiring board substrates or components. HumiSeal® Stripper 1080 contains no ozone depleting chemicals and meets North American air quality regulations. |
| Stripper 1091 | -compatible with all HumiSeal silicone coatings. -safe for use on printed circuit board assemblies. -compatible with metals, PTFE, polyethylene, and polypropylene. -no ozone depleting chemicals. | HumiSeal® Stripper 1091 dissolves cured HumiSeal® silicone coatings without negatively affecting printed wiring board substrates. HumiSeal® Stripper 1091 contains no ozone depleting chemicals and meets North American air quality regulations. |
| Stripper 1100 | HumiSeal® Stripper 1100 is: -unique stripper to remove dual cure acrylated urethane conformal coating. -harmless to solder, copper, silver, gold, and nickel plating. -is only available in the USA. -no halogens or aromatics. -low-volatility. | HumiSeal® Stripper 1100 is a unique stripper to remove dual cure acrylated urethane conformal coating such as UV40 family products. HumiSeal® Stripper 1100 does not contain any halogenated hydrocarbons, aromatics or flammable ingredients. Unlike methylene chloride based products that evaporated quickly, HumiSeal® Stripper 1100 remains on the surface to penetrate and soften the coating. HumiSeal® Stripper 1100 will not remove or attack solder, copper, silver, gold and nickel plating. |
* All above full compliance with the RoHS Directive 2011/65/EU.
．Masking Products
| Item No. |
Feature | Application |
| Mask TS 300 | -Non-flammable. -Temperature resistant masking material. -Pink color. -Ability to keep contact points and connections free of coating. -Easy removal. | HumiSeal® TS 300 is a non-flammable, high temperature, temporary mask designed for use on printed circuit boards that require masking during the conformal coating process. HumiSeal® TS 300 effectively covers and protects parts and connections where coating is not desired, and can then be peeled away easily. HumiSeal® TS 300 contains no ammonia and will not inhibit thermal cure of silicone conformal coatings. HumiSeal® TS 300 can withstand limited exposure to temperatures as high as 260°C. |
| Mask UV92 | -A soft, one part, UV curable masking material. -A thixotropic paste -Applied easily because of its shearing thinning viscosity profile and is 100% cured by exposure to UV to provide a temporary barrier to prevent ingress of coatings into keep out areas. -Excellent solvent resistance that provides selective release from conformal coating. -Ability to survive intermittent exposure to temperatures up to 150°C. | HumiSeal® UV92 is a soft, one part, UV curable masking material. HumiSeal® UV92 applies easily because of its shearing thinning viscosity profile and is 100% cured by exposure to UV to provide a temporary barrier to prevent ingress of coatings into keep out areas. HumiSeal® UV92 has excellent solvent resistance that provides selective release from conformal coating. HumiSeal® UV92 will survive intermittent exposure to temperatures up to 150°C. HumiSeal® UV92 is REACH and RoHS compliant and available in bulk and syringes |
* For more details, please contact us.
．Examples
Electronics
Materials and Chemicals
Plastics and Rubber
Machinery
Adhesive Tech.