BEVA 371® AD08

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A heat seal adhesive developed by Gustav A. Berger of New York, which is widely used for the lining of oil paintings, heat seal facings and the making of laminates with fibreglass etc. Particle Technology Limited is the only authorised manufacturer outside the USA licensed to produce BEVA 371 ®, this version being the latest formula.

BEVA 371 has the following advantageous properties:

  • BEVA 371 is non-aqueous and is dissolved in non-polar petroleum fractions known to be harmless to most paint films. It is applied cold. It causes no contractions, expansions, or softening of the materials to which it is applied. This makes possible its application to the most delicate surfaces.
  • Shrinking and distortion is minimal.
  • Heat sealing can be done days or weeks after application of BEVA 371 ®. Since it is completely dry at room temperature, it is easy to reassemble fragments and secure them in the right position with a tacking iron. BEVA was specially formulated for an activation temperature of 65-70º C which was felt to be the best for thermoplastic treatment of old, distorted paint films and cellulose tissues. At this temperature, old paint films usually become quite soft and can be bent to be brought back into intimate contact with the supporting fabric.
  • At a temperature of 65º C BEVA 371 ® becomes as tacky as a contact adhesive at room temperature. A firm bond can be achieved almost instantly and with minimal pressure so that even the most delicate textures do not suffer.
  • Because BEVA 371 ® does not have to be applied directly to the objects to be adhered and is viscous at activation temperature, the smallest fragments can be put together at leisure, without the danger of soiling them.
  • Errors can be easily corrected even after heat sealing because BEVA 371 ® is reversible, easy to remove and can be remelted whenever needed.
  • BEVA 371 ® has only limited solubility at room temperature though it absorbs solvents and forms gels which no longer adhere to the bonded materials. These gels permit removal without staining.
  • A large proportion of low-molecular substances with high melting point have been incorporated in the formulation - they make it fairly rigid and free from cold flow at room temperature. These qualities enable BEVA 371 ® to keep the painting straight after lining and to provide a firm bond for facings.
  • The large proportion of low molecular substances in the formulation enables it to maintain a low viscosity when used hot or dissolved in harmless petroleum fractions. This makes impregnation and consolidation of paint layers and canvas possible at every stage of the lining process and even thereafter, if so desired.
  • It is possible to apply BEVA 371 ® by brush, paint roller or spray without impregnation of solvents.
  • It is also possible to lower the heat sealing temperature by using BEVA 371 ® films half dry or moistened with sprayed-on petroleum fractions.

Price for Delivery on application.

Conservation By Design are currently undertaking trials of a new formula, if you would like to know more or be involved please contact Conservation By Design on +44 (0) 1234 846300.

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