Library And Information Science fields Librarians must declare a state of emergency on the rate of deterioration of their collections, in order to retard the level of deterioration. Library materials are negatively affected by natural and human factors, observation and experience have shown that they are more vulnerable to decay and damage by climate and environmental factors. Library & Information Services Division Bhabha Atomic Research Centre, Trombay, Mumbai – 400085 E-mail: bskademani@yahoo.com ABSTRACT This paper discusses the importance and need of preservation of information resources in libraries, factors that affect degradation and deterioration of library materials and methods of tackling them. Factors that Promote Paper Deterioration. What is deterioration? Environmental factors that influence the deterioration of materials A. Moncmanová Faculty of Chemical and Food Technology, Slovak University of Technology, Bratislava, Slovak Republic. NHI is cultural agency under the National Commission for Culture and the Arts (Office of the President) in the Philippines. Why is 500-year old paper often in better condition than paper from 50 years ago? 2. Keywords: Deterioration, library materials, librarianship, books shelves INTRODUCTION Deterioration is a state of depreciation in value or in quality. Nimfa Maravilla (nee Rubias) is a chemical engineer who joined the National Historical Institute's (NHI) Materials Conservation Center (MCC) in 1984.
Library collections are precious, but also easily damaged by molds. 1. Causes of Deterioration of Paper Nimfa R. Maravilla. All organic materials, including library materials, are subject to deterioration. Within a storage area these factors can be controlled and monitored to ensure optimum conditions. The materials of which library and archive collections are composed, namely paper, parchment, palm leaves, birch bark, leather and adhesives used in bookbinding, are susceptible to two main forms of deterioration. Physical Deterioration of a book and library materials. Therefore if this is applied to library materials it is known to be a state in which library materials in a state of depreciating in value as well as in quality.

The responsibility of the Federal Government, of the National Library and of other libraries throughout Nigeria is emphasised. Enviornmental (climatic Factors) factors like light, heat, humidity and moisture, The deterioration of information materials is caused by either inherent chemical instability of the materials or the external environmental factors (Akussah, 2006). Paper is made of cellulose -- a repeating chain of glucose molecules -- derived from plant cell walls. In other words, what makes some papers deteriorate rapidly and other papers deteriorate slowly? We know that paper based materials occupy a major part of library materials. library materials are susceptible to deterioration by the following factors:- 1. The rate and severity of deterioration result from internal and external factors: most importantly, the composition of the paper and the conditions under which the paper is stored. Therefore if this is applied to library materials it is known to be a state in which library materials in a state of depreciating in value as well as in quality. A change of original state of any material by interaction between the object and the factors of destruction. Since books are made of mold's favorite food - organic matter- it's important to tightly control environmental conditions.
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