Assessing the suitability of new film laminates for sustainable insect eradication by modified atmosphere in museums

Manar M. Elkhial · Nesrin M.N. El Hadidi

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Conservation Techniques and Studies Museums and Cultural Heritage Cultural Heritage Materials Analysis

Abstract

Abstract The increasing demand for applying modified inert atmosphere (MIA) systems for insect eradication in museums has led to the desire for lower-cost consumable materials, particularly laminated plastic films. An ultra-low oxygen-permeable laminate is required for creating successful MIA systems to keep the oxygen concentration lower than 0.3%, which is commercially available but at a high cost. The wide use of local laminated films for food preservation makes them a perfect target for testing and improvement for MIA applications. However, the lack of laboratory oxygen permeability test methods to gauge the potential of local laminates for inclusion in MIA applications distracts attention from looking at them as alternatives and encourages the expense on extremely expensive imported ones. Therefore, the present work investigates the potential of employing two laminates (one local and one imported) to create a successful leak-proof MIA system. A laboratory easy-to-use test method was developed to assess the oxygen-gas retention property of each laminate by measuring its oxygen permeability and consequently oxygen transmission rate (OTR). The test method is a sealed static diffusion chamber separated in the middle by a known area (cm2) of the test laminate to be tested. The test relies on measuring the concentration of oxygen in either sides of the laminate membrane within the sealed system and monitors the change over time to assess the OTR of the laminate. The specifications and design of the test chamber are adapted from the ASTM Designation: E2945 − 14, to meet the facilities of a typical artefact fumigation laboratory. The test is undertaken at standard MIA conditions (temperature of 25°C, relative humidity of 45%, and target oxygen concentration of 0.3). Results indicated that the new method is useful for an unlimited number of tests of an unlimited number of laminates. The conducted tests proved that the local laminate normally used for food packaging has superior advantages over the long-used imported ones.

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References

2020A review of analytical methods for assessing preservation in waterlogged archaeological wood and their application in practice 2016Food Packaging 2018Museum Pests–Cultural Heritage Pests 1993Comparative analysis of insect control by nitrogen, argon and carbon dioxide in museum, archive and herbarium collections 2000Inert Gases in the Control of Museum Insect Pests 2012Large-scale assessment of light-induced color change in air and anoxic environments 2004The Use of Oxygen-Free Environments in the Control of Museum Insect Pests 2015Anoxic treatment for the disinfestation of wood cultural heritage: assessment of the effects and harmfulness on different species

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