(SEM x 30) FIBERGLASS (Open-Cell Structure) SEM micrograph shows 30 times of an open cell structure of fiberglass thermal insulation, very high water absorption and water vapor permeability.

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(SEM x 7) POLYSTYLENE FOAM (Interconnecting Cell Structure) SEM micrograph shows 7 times of an interconnecting cell polystylene foam, high water absorption and water vapor permeability.

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(SEM x 20) AEROFLEX (Closed Cell Structure) SEM micrograph shows 20 times Aeroflex's closed cell elastomeric thermal insulation, lowest water absorption and water vapor permeability. Aeroflex's specially selected elastomers and closed cell structure act as multilayers of vapor barriers to maintain stable K value during long service without need of vapor barriers.

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