DYMAX 9-20557

Harmonization Code : 3910.00.00.90 | Silicones in Primary Forms; Others

DYMAX 9-20557

Main features

  • Flexible Low-Modulus Protection
  • Light and Shadow-Area Cure
  • Fluorescent Conformal-Coverage Inspection

Product Description

Dymax Multi-Cure 9-20557 Flexible Light-Cure Conformal Coating is a single-component, medium-viscosity conformal coating for printed circuit boards and electronic assemblies. UV or visible light cures exposed areas, while secondary heat cure develops coating in shadowed regions. The flexible, low-modulus cured film provides protective coverage without the rigidity of a bulk encapsulant. Blue fluorescence supports inspection, and the coating can be applied across metal, ceramic, PCB, flex, and silicon surfaces. Its solvent-free acrylated urethane form avoids component mixing and supports controlled dispensing.

Key features

  • Flexible Low-Modulus Protection: The cured film combines conformal coverage with a flexible mechanical profile.
  • Light Plus Shadow-Area Cure: UV or visible light cure is complemented by secondary heat cure in shaded regions.
  • Blue-Fluorescent Inspection: Fluorescence under black light supports coating coverage checks.

Applications / Suitable for

  • Conformal coating of printed circuit boards
  • Conformal coating of electronic assemblies
Product Family

DYMAX 9-20557

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TDS, SDS & Technical Documents

Technical Specifications

General Properties
Appearance
Appearance at room temperature.
Clear to Light Yellow
Chemistry Type
Acrylated Urethane
Refractive index
The refractive index determines how much the path of light is bent, or refracted, when entering a material. It is calculated by taking into account the velocity of light in vacuum compared to the velocity of light in the material. The refractive index calculation can be affected by the wavelength of light and the temperature of the material. Even though it is usually reported on standard wavelengths it is advised to check the TDS for the precise test parameters.
1.51
Physical Properties
Viscosity
Viscosity is a measurement of a fluid’s resistance to flow. Viscosity is commonly measured in centiPoise (cP). One cP is defined as the viscosity of water and all other viscosities are derived from this base. MPa is another common unit with a 1:1 conversion to cP. A product like honey would have a much higher viscosity -around 10,000 cPs- compared to water. As a result, honey would flow much slower out of a tipped glass than water would. The viscosity of a material can be decreased with an increase in temperature in order to better suit an application
2,300 mPa.s
Mechanical Properties
Elongation
Elongation is the process of lengthening something. It is a percentage that measures the initial, unstressed, length compared to the length of the material right before it breaks. It is commonly referred to as Ultimate Elongation or Tensile Elongation at break.
110 %
Chemical Properties
Water Absorption
1.0 %
Other Properties
Storage Temperature
10 - 32 °C

Additional Information

Technical properties

As-supplied / before-processing properties

As-supplied characteristics used for material and process evaluation. Numerical values are typical unless otherwise identified.

Property Value Unit Method / condition
Solvent content No nonreactive solvents - As supplied
Chemical class Acrylated urethane - As supplied
Appearance Clear to light yellow - As supplied
Density 1.05 g/ml ASTM D1875
Viscosity 2,300 nominal cP ASTM D1084; 20 rpm
Shelf life 12 months Original unopened container; store at 10 to 32 deg C
Technical properties

After-processing / final-state properties

Final-state characteristics after the stated cure or processing condition. Numerical values are typical unless otherwise identified.

Property Value Unit Method / condition
Durometer hardness D60 - ASTM D2240
Tensile strength at break 10 (1,500) MPa (psi) ASTM D638
Elongation at break 110 % ASTM D638
Modulus of elasticity 89 (13,000) MPa (psi) ASTM D638
Boiling water absorption 2.7 % ASTM D570; 2 hr
Water absorption 1.0 % ASTM D570; 25 deg C for 24 hr
Dielectric withstand voltage >1,500 V MIL-I-46058C
Volume resistivity 1.48 x 10^15 ohm cm ASTM D257

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