Electronic control module having fluid-tight seals of a polymer material which expands when wet

An electronic module comprising:

• a housing having an exterior surface configured for exposure to a fluid;
• an electronic component mounted within the housing;
• an interior cavity within the housing intermediate to the electronic component and the exterior surface;
• electrical connections coupled to the electronic component and extending through the interior cavity and the exterior surface;
• a polymer material within the interior cavity responsive to the fluid, such that the polymer material expands upon contact with the fluid sealing the electrical connections within the interior cavity and preventing the fluid from contacting the component;
• and
• a sealing layer within the interior cavity configured for containing the polymer material.

An electronic module comprising:

• a housing;
• a cavity within the housing;
• an electrical lead traversing the cavity and having a terminal end extending beyond the housing,
• wherein the terminal end is exposed to a fluid;
• and
• an expandable polymer material within the cavity and confined by said pressure resistive layer;
• a pressure resistive layer overlying the expandable polymer,
• wherein the pressure resistive layer and the expandable polymer cooperate to form a seal surrounding the electrical lead and sealing the lead to the housing upon contact of the expandable polymer by the fluid.