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Konform® SR Silicone Conformal Coating
Konform® SR Silicone Conformal Coating
UL-certified silicone conformal coating for maximum flexibility and protection from extreme temperatures and vibration damage
Konform SR provides maximum flexibility for extreme temperatures. This transparent conformal coating provides ideal protection for both rigid and flexible printed circuit boards. Cured coatings are hydrolytically stable and retain their physical electrical properties after high temperature and humidity exposure. Konform SR will not stress delicate circuit components.
Konform SR is available in three different viscosities to match your application process:
- Standard viscosity - 40± 5 cps
- Medium viscosity - 60± 5 cps
- High viscosity - 120± 5 cps
Features & Benefits
- Engineered for applications where flexibility and high temperature resistance are required
- Silicone coating stable from -85°F/-64°C to 390°F/199°C
- High dielectric strength of 1100 volts/mil
- Easily removed with Electro-Wash® Two Step or CircuitWorks® Conformal Coating Remover Pen
- Passes the laboratory tests of MIL-I-46058C. However, it is not qualified on QPL-46058.
- Compliant to IPC-CC-830A
- RoHS Compliant
- UL Recognized, File E76307
- UL 94 V-0
- Contains a UV indicator for Quality Control inspection using medium intensity light at 265-335 nm
- Extends component life by protecting against adverse environments
- Good insulation properties, excellent flexibility
- Resists moisture, salt, fungus, corrosive vapors, and severe environments
- Engineered to withstand heat generated by electronic circuitry as well as climatic temperatures
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What is the difference between full cure and tack-free cure?
Full cure is when it meets all the final specifications. There might be some out-gassing, but it will be as hard as it is going to be, and adhesion is as good as it gets. Tack-free is as the name suggests, not sticky so you can move it along the assembly process.
How can you reduce chemical exposure?
Every organization using hazardous chemicals within their facility has the responsibility to equip their facility and personnel to maintain exposure levels below the TLV. Personal monitoring badges can be used to measure exposure of a specific material. Then, depending on the threshold limit and the application, exposure can be controlled with PPE like masks, face shields, respirators, and even coveralls. If they don’t reduce exposure below the recommended limit, you will need to consider a special ventilation hood or even containment booth. As you can see, as the exposure limit gets down to a certain level, the equipment required to safely use the solvent can get impractical. At that point, your best option is to consider a safer alternative.
What is the difference between dielectric strength and dielectric withstand voltage?
The dielectric strength is material intrinsic property and withstand voltage is surface property which depend on thickness of the material. They can be slightly different for thicker materials, but for conformal coating, the two numbers should be very close or the same. That is because we test coating at 3-5 mils thickness, calculate, then report the value per mil.
What type of UV light / black light should I use for QC inspection of the final conformal coating?
Conformal coating with UV tracer can be inspected with any typical UV lamp which has wavelength of 320-380 nm.
What solvent can I use to thin this conformal coating?
Toluene or acetone can be used as a thinning agent. Make sure it is anhydrous, so contains as little moisture as possible.
How do you apply liquid conformal coating? (CTSR)
Apply to clean, moisture-free surface. Areas not requiring coating should be masked. Application: Coating may be applied by spraying, brushing, dipping or flow coating. Allow coating to flow around components. Cure: Room temperature cure: A 1.0 mil coating will be tack-free in 15 minutes. Full cure requires 24 hours @ 77˚F (25˚C). Heat cure: 8 hours @ 170˚F (77˚C). An open vessel of water placed in the drying chamber will facilitate curing. UV detectable for QC inspection. Removal: Coating may be removed by soaking in Electro-Wash® Two Step Cleaner Degreaser. Use CircuitWorks® Conformal Coating Remover Pen for spot removal. After the new component is installed, areas should be cleaned and recoated.
How do you use an aerosol conformal coating? (CTSR-12)
Shake well. SURFACE MUST BE CLEAN & MOISTURE FREE. Areas not requiring coating should be masked. Coating: Spray top to bottom, allowing coating to flow around components. Rotate board 90˚ and repeat process 2 or more times. If nozzle clogs, clean with solvent or use new nozzle. Cure: A 1.0 mil coating will be tack-free in 15 minutes. Full cure requires 24 hours @77˚F/25˚C. Heat Cure: 8 hours @170˚F/77˚C. An open vessel of water placed in the drying chamber will facilitate curing. UV detectable for QC inspection. An open vessel of water placed in the drying chamber will facilitate curing. UV detectable for QC inspection. Removal: Coating may be removed by soaking in Electro-Wash® Two Step. Use CircuitWorks® Conformal Coating Remover Pen for spot removal. After the new component is installed, areas should be cleaned and re-coated.
When using conformal coatings in general, what causes a "milky" cure or white "foam" on the substrate?
In almost all cases, the cloudy or milky cure comes from coating in higher humidity conditions. The white foam (from an aerosol) is caused the same way. We have the following suggestions:
- If possible, allow the substrate and coating material to come to approximately the same temperature when applying.
- Avoid applications in RH > 60%. High humidity ranges will discolor some coating resins and will start curing others. Besides the aesthetic value, it certainly may affect adhesion to the material.
- Specifically on the silicone coating, if the resulting application is foamy, increase the focal point of the can, ie back off to about 10 -12” from the substrate & make 2 -3 light passes rather than one heavy pass to coat the board.
What types of coverage areas are to be expected with the conformal coatings in general?
Wet film thickness = Sq. ft. per gal.
0.1 mil = 16,040
0.5 mil = 3,210
1 mil = 1,600
2 mil = 802
3 mil = 535
4 mil = 401
5 mil = 321
6 mil = 267
7 mil = 229
8 mil = 201
9 mil = 178
10 mil = 160
What spigot or spout do you recommend for your metal 5-gallon and 55-gallon drums?
Metal 5-gallon containers come with a flexible pop-out spout for easy pouring. 55-gallon drums are compatible with standard 2" spouts.
How do I properly dispose of an aerosol can after it is empty?
It may be different state-by-state, so contact your state environmental agency for regional specific regulations. For a general guideline, here is the process according to EPA hazardous waste regulations 40CFR. The can has to be brought to or approach atmospheric pressure to render the can empty. Puncturing is not required, only that it “approach atmospheric pressure”, i.e. empty the can contents until it’s no longer pressurized. This insures that as much contents as is reasonably possible are out of the can. It is then considered “RCRA-empty”. At that point it can be handled as any other waste metal container, generally as scrap metal under the recycling rules. Note that the can is still considered a solid waste at this point (not necessarily hazardous waste).
How do I figure out the shelf life of a product?
The shelf life of a product can be found on either the technical data sheet (TDS), available on the product page, or by looking on the certificate on conformance (COC). The COC can be downloaded by going to https://www.chemtronics.com/coc. Once you have the shelf life, you will need to add it to the manufacture date for a use-by date. The manufacture date can be identified by the batch number. The batch code used on most of our products are manufacture dates in the Julian Date format. The format is YYDDD, where YY = year, DDD = day. For example, 19200 translates to the 200th day of 2019, or July 19, 2019. This webpage explains and provides charts to help interpret our batch numbers: https://www.chemtronics.com/batch-codes.
How do you prevent the valve from clogging up when using aerosol conformal coating?
I suggest you get into the habit of clearing the valve after every use. You turn the can upside-down and spray until it only sprays propellant. If you don’t do that, you run the risk of dried coating building up in the valve or actuator button. If in the button, you can switch it for another one and it should work. If in the valve, there may not be much you can do to save the can.
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