Application of 1C51 Silicone Conformal Coating

Conformal coatings can be successfully applied to substrates that have been cleaned prior to coating and also to substrates assembled with low residue “no clean” materials. Users should perform adequate testing to confirm compatibility between the conformal coating and their particular assembly materials, process conditions and cleanliness level. Please contact a HumiSeal representative for additional information.

1C51 is designed for application without additional thinning. Solvents or other thinners should not be mixed with 1C51. 1C51 may be applied by spray, brushing, flow coating or dipping. The time required to reach a tack free state is dependent on ambient conditions such as temperature and relative humidity. The processing guidelines contained in this document were obtained with an ambient relative humidity of 50%.

Dipping

A controlled rate of immersion and withdrawal (5-15 cm/min) will ensure even deposition of the coating and ultimately a uniform film. Blanketing dip tanks with an inert gas such as nitrogen can extend pot life.

Spraying

HumiSeal® 1C51may 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® 1C51. 

Brushing

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

Curing

HumiSeal® 1C51 is a thermally cured conformal coating. The actual curing temperature of HumiSeal® 1C51 is dependent upon several parameters such as heat sink characteristics of parts being coated, the type of oven used for curing process, as well as oven loading parameters. The cure mechanism for thermally cured silicones like HumiSeal® 1C51 may be inhibited by a variety of materials i.e.; amines, acrylates, certain ingredients from latex rubber etc. It is recommended that process and material compatibility be considered when incorporating HumiSeal® 1C51 into the production environment. Cotton gloves are recommended for operators who will be handling assemblies prior to coating with HumiSeal® 1C51.