Lecture 011.008

STUDY, CONSOLIDATION AND PROTECTION OF NATURAL RUBBER
BY FRANCOIS DUBOISSET

A MAA chair of George Nelson, dating from 1958, was restored at the National Institut of Heritage department of restoration in Paris. The articulation of the back is composed with natural rubber. These are highly cracked due to exposure to light, coupled with the use of the chair. A scientific and technical protocol was developed to establish a reversible method of filling cracks. For this, three resins, which are uncommon in conservation, were tested. A supple thermoplastic resin: ethylene vinyl acetate added with an antioxidant, completed the specification for conservation of natural rubber. This resin has been injected with a microsyringe into the cracks of the rubber shock mounts to give mechanical strength to these parts and to the chair.

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