Museums, libraries and archives, like all commercial facilities located in highly
populated, urban areas, are subject to various sources of outdoor air pollution,
including combustion exhaust from vehicles and emissions from nearby industrial
facilities. Concentration levels of these outdoor air pollutants are often higher
than those recommended for preservation environments. If drawn indoors through
HVAC air intakes, or by natural filtration, valuable artefacts, documents and
other collections may be exposed and permanently damaged. Long-term exposure to
outdoor air pollutants may result in the yellowing of paper, the corrosion of
metals, and the fading of painted artwork.
Fluctuations in temperature and relative humidity also contribute to the degradation
of valuable collections. These fluctuations cause all moisture-containing materials
to expand and contract, resulting in brittleness and cracking. Heat, in combination
with high relative humidity, may promote the corrosion of metals and the growth
of moulds and bacteria. Low humidity can also be detrimental, causing natural
adhesives, parchment and animal skins to dry and harden. Purafil is a single-source
solution for control of the indoor environment.
We offer a comprehensive selection of gas-phase and particulate air filtration
systems designed to permanently remove pollutants from outdoor and recirculation
air. Our environmental monitors offer real-time measurements of environmental
corrosion, as well as temperature and relative humidity.
Click here to download the Dutch State Archives Case Study.
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The Use of Purafil Media to Control Ethylene Gas
The destructive properties of ethylene gas (C2H4, MW 28.05) has presented a problem to industries involved in the handling and
storage of cut flowers, plants, fruits, and vegetables. Ethylene gas is a naturally
occurring gas which causes fruits and vegetables to ripen and has been long recognized
as a significant factor in the storage behaviour of fresh produce and products
in the horticultural industry. Presence of ethylene in amounts ranging from a
few parts per billion (ppb) to a few parts per million (ppm) can reduce plant
vigour, decrease life of various plant parts, and reduce stock quality. Purafil
offer a range of "Isolette Sorber Sachets" and "Ethylene Removal Pads" which can
be placed in the containers in which produce is shipped and stored or when the
produce is displayed. The sachets and pads contain Purafil Chemisorbant Select
media which removes ethylene using the process of chemisorption, thereby greatly
extending the life and quality of the product.
Click here to download the Ethylene Case Study.
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