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Fine-L-Kote SRV Silicone Conformal Coating

Silicone conformal coating that is high gloss, ultra-clear, moisture and abrasion resistant

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Features & Benefits

Low VOC
Low toxicity – HAPs free
Exceptional surface finish – high gloss, superior transparency
Moisture resistant
Corrosion resistant
Vibration resistant & flexible
Thermal resistance - 392°F (200°C)
Dielectric strength - 720 volts/mil
RoHS Compliant

Specifications

Meets IPC-CC-830B
Passes the laboratory tests of MIL-I-46058C. However, it is not qualified on QPL-46058.
UL94 flammability rating V-0
MIL-STD 810G salt spray test
MS941-04 salt spray test

Product Details

Part Numbers: 2127-P,2127-G,2127-5G,2127-54G,2127-P950,2127-G950,2127-5G950,2127-54G950

A great replacement for Dow conformal coating 1-2577 & 1-2620. Low VOC coating – Ideal for moisture, thermal, corrosion and vibration protection.

Fine-L-Kote™ SRV is a high gloss, ultra-clear conformal coating that is moisture and abrasion resistant. This coating offers resilient, mechanical stress-reducing PCB protection, and is low VOC. It extends component life by protecting against adverse environments, with resistance to moisture, salt, fungus, and corrosive vapors. Because of its exceptional dirt, dust, and soil repellency, the coated surfaces remain clean longer.

Fine-L-Kote SRV cures quickly at ambient conditions or heat acceleration can speed in-line processing. Ready-to-use viscosities are available: standard (SRV) for manual and selective spray systems, and high viscosity (SRV 950) for dipping processes.

Fine-L-Kote SRV is available in 2 viscosities:
Standard - ready-to-use at 82cps.
High - for extra thick coating, or to dilute as required.

Silicone conformal coating provides excellent protection in a very wide temperature range. SR provides good chemical resistance, moisture and salt spray resistance, and is very flexible. Silicone conformal coating isn’t abrasion resistant because of its rubbery nature, but that property does make it resilient against vibrational stresses. Silicone coatings are commonly used in high humidity environments, like outdoor signage.

For more information, check out our Essential Guide to Conformal Coating.

Part #	Name	Units Per Case
2127-P	Stnd viscosity - 1 pint liquid	2
2127-G	Stnd viscosity - 1 gal liquid	1
2127-5G	Stnd viscosity - 5 gal liquid	1
2127-54G	Stnd viscosity - 54 gal liquid	1
2127-P950	High viscosity - 1pt liquid	2
2127-G950	High viscosity - 1 gal liquid	1
2127-5G950	High viscosity - 5 gal liquid	1
2127-54G950	High viscosity - 54 gal liquid	1

Applications

Electronic Assembly

FAQ's

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.

What does 2-step curing mean?

That just means you break the accelerated curing process into 2 stages. You basically ramp up the heat so the coating has an opportunity to level. Otherwise, you can get a wrinkling or orange peel texture. That texture doesn’t affect performance, just aesthetic. This is not an issue when curing in ambient conditions.

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.

How do you apply liquid conformal coating? (2127, 2125)

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 30 minutes. Full cure requires 24 hours @ 74˚F (23˚C). Heat cure: 30 minutes @ 90˚F (32˚C) then 100 minutes @ 199˚F (93˚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.

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: 1) If possible, allow the substrate and coating material to come to approximately the same temperature when applying. 2) 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. 3) 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 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.techspray.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.techspray.com/batch-codes.

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