Maxtech COAT 721LB Matte low viscosity Silicone conformal coating

We supply OEM & ODM service, You are welcome to test the samples!

Product description

COAT 721LB Matte low viscosity conformal coating is a liquid hygroscopic cured silicone, which forms a flexible rubber body after curing, fully complying with the requirements of the EU ROHS Directive. The release of alcohol substances during the curing process is non-corrosive to polycarbonate (PC), copper and other materials, and has good bonding and sealing performance for most materials, protecting electronic products under harsh conditions in a stable state.
COAT 721LB silicone coated adhesive cured elastomers have the following properties:
* One component, easy to use, short time without sticking hands
*Excellent chemical resistance
* Resistance to moisture, dirt and other atmospheric components
*Reduce mechanical stress and tension caused by mechanical, thermal shock and vibration
* Excellent electrical insulation, corona resistance
* Excellent outdoor aging, service life of up to 20-30 years
* Stable mechanical and electrical properties between -60 and 260 °C
Application
LED lamp seal, plastic metal shell seal; PCB board components, wiring harness fixed
Waterproof coating for delicate electronic accessories, electrical and communication equipment
Small module, photoelectric display and circuit board, under 6mm thin layer potting, plugging

We supply OEM & ODM service, You are welcome to test the samples!

As a manufacturer, we would like to share with you what we have learned about the different types of potting compounds and their characteristics.
The potting compounds on the market vary in viscosity, requirements for cure conditions, among other factors. Compounds such as polyurethane, silicone, and epoxy are widely used in a variety of applications.
Silicone Potting Compounds are soft and flexible, silicone potting compounds and encapsulating materials possess a good level of elongation.Silicone potting compound can also withstand a wide range of temperatures. Most silicone materials are able to operate at temperatures between -40°C and 200°C.
Epoxy potting compounds generally perform as a better adhesive, high-temperature resistance, and chemical resistance and have better adhesion to a wide variety of substrates and typically do not need primers.
Polyurethane Potting Compounds generally have better flexibility, elongation, and abrasion resistance.
Acrylic Potting Compounds are UV and heat-hardening materials, with fast hardening, adequate chemical resistance, and clear appearance.

COAT 721LB Matte low viscosity Silicone conformal coating

‏15.00 US$

‏375.00 US$ لكل 25 كجم

Color

الكمية

Test items   Test standard   Units   721LB
Color   Visual   ---   Black fluid
Viscosity   GB/T 2794-2022   25℃, mPa ·s   3000-4000
Density   GB/T 13354-1992   25℃, g/cm3   0.99±0.02
Tack free time   GB/T13477.5-2002   25℃, 55%RH,min   15-30
Color   Visual   ---   Matte black elastomer
Hardness   GB/T 531.1-2008   Shore A   20 ± 5
Thermal conductivity   GB/T 10297-2015   W/m.K   0.27
Elongation at break   GB/T 528-2009   %   100
Tensile strength   GB/T 528-2009   Mpa   0.4
Tensile modulus   GB/T 528-2009   Mpa   1.0
Shear strength   GB/T 7124-2008   Mpa, Fe/Fe   0.3
Dielectric strength   GB/T 1695-2005   kV/mm（25℃)   25
Loss factor   GB/T 1693-2007   (1MHz) (25℃)   0.09
Dielectric constant   GB/T 1693-2007   (1MHz) (25℃)   2.8
Volume Resistance   GB/T 1692-2008   (DC500V) Ω · cm   1.0* 1014
l This product should be stored in A cool and    dry environment below 25℃ , and the storage period of A/B below 25℃ is 1 year.

l The products that exceed the storage period should be tested to confirm whether there is  any abnormality before use.

l Such products are classified as     non-dangerous goods and can be

transported as general chemicals. Be careful of leaks during transportation!
As a manufacturer, we would like to share with you what we have learned about the different types of potting compounds and their characteristics.
The potting compounds on the market vary in viscosity, requirements for cure conditions, among other factors. Compounds such as polyurethane, silicone, and epoxy are widely used in a variety of applications.
Silicone Potting Compounds are soft and flexible, silicone potting compounds and encapsulating materials possess a good level of elongation.Silicone potting compound can also withstand a wide range of temperatures. Most silicone materials are able to operate at temperatures between -40°C and 200°C.
Epoxy potting compounds generally perform as a better adhesive, high-temperature resistance, and chemical resistance and have better adhesion to a wide variety of substrates and typically do not need primers.
Polyurethane Potting Compounds generally have better flexibility, elongation, and abrasion resistance.
Acrylic Potting Compounds are UV and heat-hardening materials, with fast hardening, adequate chemical resistance, and clear appearance.
Surface treatment: Before coating, dust, moisture (moisture) and oil should be removed from the surface of the

object to be coated and kept dry.

Cover: If some connectors, sockets, switches, inserts and other areas are not allowed to have coating materials. Appropriate covering measures should be taken.

Construction: According to the complexity of PCB, device distribution density and configuration can be used brush coating, spray, dip coating and other different methods of construction. For a small amount of spraying, manual spray gun can be used, automatic spraying, and 100% paint can be used directly. The amount of spray pressure will depend on the specific type of spray equipment used, and the effect goal is that the coating does not hang and does not leak. The thickness of a coating film is generally between 0.1-0.4mm, if you want to get a thicker coating, it is best to get by applying two layers of thinner coating, and it is required that the first layer must be completely dried before being allowed to apply the second layer.

Curing: Flat on the support after construction, can be cured at room temperature. Heating can speed up the curing speed, the recommended heating temperature of 50℃-60℃ 5-10 mins.

Room temperature curing: coating is cured at room temperature by reacting with water vapor. The coating of 0.1mm will reach surface drying in about 10min, and it will take 72 hours to cure completely. The recommended curing conditions are 25℃ and at least 50% relative humidity, and increasing the temperature and humidity can speed up the curing speed.

Heating curing: heating can shorten the surface drying time of the product. Generally 0.1mm thick coating needs to volatilize at room temperature for 10min. If the coating has fish eyes or contains air bubbles, allow more time for the glue to level out before heating up. Boards coated with 9060 should be stored at room temperature for at least 72 hours before low temperature testing.

Repair: Repair an already coated component by simply touching the soldering iron directly to the coating to remove the component. Then install a new component, and clean the area with a brush or solvent; It can also be cleaned with solvent; And reapply with paint after drying.

COAT 721LB Matte low viscosity Silicone conformal coating

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Different potting materials

Application process