Evasol Adhesive for the Conservation industry

Evasol Adhesive

An archival, neutral, buffered, reconstitutable synthetic adhesive.
A co-polymer formulated specifically for the Conservation industry.

Evasol has undergone extensive accelerated aging tests by Australia's major scientific research body, the CSIRO. This has enabled it to be used in those conservation and archival environments which have long term commitments to the preservation of the National Estate. Furthermore, Evasol has passed the Photographic Activity Test (PAT), which is authorised and undertaken by Archives Australia.

The characteristic of this EVA* co-polymer molecule is that it is less susceptible to acid hydrolysis than the traditional PVA adhesives. It includes significantly less of the acid-forming polyvinyl acetate, which is present in greater quantities in PVAs, and more of polyethylene, the component in Evasol which does not form acid in either of its wet or dry state. Furthermore, the EVA molecule is made flexible by the presence of the long polyethylene co-polymer molecule. No plasticisers have been added to this formulation.

A particular feature of Evasol is its suitability for archival work, because of its neutral pH and buffering. It has a flexible film, excellent adhesion to a variety of substrates, including difficult surfaces coated with varnish, lacquer, paint, or plastic films such as PVC. It will begin to reconstitute to its white emulsion state within 10 seconds upon contact with water. It has been formulated to a pH of 6.5 - 7, and specifically buffered for use in the archival and conservation industry. Note that the pH will fall slightly over time due to unavoidable hydrolysis of minute traces of vinyl acetate in the emulsion system.

Evasol has been specially formulated to give good bonding to paper and paper board products. It has a medium open time, and this controlled drying permits a reduction in the warping or buckling of water-sensitive substrates. It may be diluted with water, or mixed with other adhesives such as starch paste or methyl cellulose, to the proportion of 10-15%, without significant loss to the initial EVA tack. Higher dilution or mix proportions may be used where other criteria, such as heavier weights of paper, or concerns of warping, are present.

Evasol is available from our Australian distributor at Conservation Resources. For any other enquiries concerning Evasol, please contact us by clicking here.

Evasol Properties

Product Name Evasol (pronounced EE VA SOL)
Basic Resin Ethylene vinyl acetate co-polymer (EVA*)
Viscosity 2000 3000 cps #3/6/25C
Appearance White; creamy and soft texture
Solids Approximately 58 60%
Initial Tack Medium
Setting Speed Medium, in temperate climate conditions
Film-forming temperature Approximately 5C
Film Appearance Very slight haze; flexible film
Water sensitivity Dry film will reconstitute to emulsion form
pH 6.5 - 7
Shelf Life 3 Years. Do not refrigerate. May need occasional stirring

Evasol MSDS

* This water-based co-polymer is technically named VAE, but common usage erroneously uses the variant formula name EVA.


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