Technology
Boveda produces small pouches for humidity buffering of an enclosed container. The pouches consist of an aqueous salt solution within a sealed vapor barrier package that can absorb or release water vapor until an equilibrium humidity is reached between the solution and relative humidity of the surrounding air.
The air, in turn, serves as the transfer medium to moderate the water content of articles in the container, such as a wooden musical instruments, food, cigars, or cannabis. Water is transferred between the article, the pouch, and the air within the container until an equilibrium condition is reached. The relation between relative humidity of the air in the container and the moisture content of the article is complex, and can be described by a moisture sorption isotherm curve.
The tendency for the solution in a pouch to retain rather than release water vapor is determined by the composition of the salts in solution. A single-salt solution will reliably produce an environment of a known equilibrium humidity. For example, at 20 °C, a saturated solution of table salt in distilled water will produce a relative humidity of approximately 75% within a container. Magnesium chloride will result in an equilibrium humidity of approximately 32%. Such salt solutions are accurate enough to be used to calibrate hygrometers. Other equilibrium humidity levels can be produced through mixtures of salts.
The pouches are made of a material that is permeable to water vapor but not to the solution within.
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Marketing and distribution
Numerous companies use the Boveda technology in their product packaging to maintain relative humidity throughout the supply chain. As of 2015, Boveda self-distributes their products for the cigar market in the United States. Internationally, Boveda has numerous distributors in Canada, South America, Southeast Asia & East Asia, Europe and South Africa. D'Addario distributes Boveda's line of Humidipak humidity control products for the music industry.
Market applications
The initial market application for Humidipak was engineered for cigars. As of 2014, Boveda is carried in over 2,500 stores globally.
Because 2-way humidity control is engineered to maintain a very specific, predetermined level of relative humidity (+/- 2% RH), the technology is being used to solve moisture-related packaging problems for many different industries and applications.
Some of these new applications are herbal medicine and medical cannabis, wooden instruments, pet food, and electronics.
Boveda products are available in many relative humidity (RH) levels ranging from 32% to 83% RH.
