Silicone 2C51

HumiSeal® 2C51 conformal coating is:

  • silicone based
  • fluoresces under UV light
  • 2 component chemical cure
  • high solids

HumiSeal 2C51 conformal coating has:

  • No VOCs or solvent
  • excellent environmental resistance and moisture resistance
  • RoHS Directive 2011/65/EU compliant

Application of 2C51 Silicone Conformal Coating

Cleanliness of the substrate is of extreme importance for the successful application of HumiSeal 2C51. Surfaces must be free of moisture, dirt, wax, grease, flux residues and all other contaminants. Contamination under the coating could cause problems that may lead to assembly failures. Mixing ratio of Part A to Part B is 1:1 by volume (or weight). Prior to application, HumiSeal® 2C51 Parts A and B should be thoroughly mixed until a homogenous blend is achieved. Vigorous mixing is not recommended as entraps air pockets into mix.


HumiSeal® 2C51 may be applied using conventional spraying equipment. Spraying should be done in an environment with adequate ventilation so that the vapour and mist are carried away from the operator. The use of thinner is not required or recommended for HumiSeal® 2C51.


Uniformity of the film depends on component density and operator’s technique.

Properties of Mixed HumiSeal® 2C51

Density (part A&B), per ASTM D1475 0.97 ± 0.03 g/cm³
Solids Content, % by weight per Fed-Std-141, Meth. 4044 99.00%
Viscosity (Part A), per Fed-Std-141, Meth. 4287 275 ± 75 centipoise
Viscosity (Part B), per Fed-Std-141, Meth. 4287 550 ± 150 centipoise
VOC 0 grams/liter
Drying Time to Handle per Fed-Std-141, Meth. 4061 10 minutes
Curing Condition to Reach Optimum Properties 30 minutes @ 70°C or 60 min @ RT
Recommended Stripper HumiSeal® Stripper 1091
Gel Time at Room Temperature 8-10 minutes
Shelf Life at Room Temperature, DOM 12 months
Hardness, Shore 00 45-55
Volume resistivity per ASTM D257 5.2 x 1013 Ohms.cm (52 TΩ.cm)

Other products in this chemistry include:

To view SDS files you need to Login or Request Access.







Contact Us