BS ISO 18919:1999

1 Scope
2 Normative references
3 Terms and definitions
4 Safety and hazards
5 Requirements for the film base
6 Requirements for the thermally processed silver microfilm
7 Requirements for the emulsion and backing layers of thermally
      processed silver microfilm
8 Requirements for image stability
9 Test methods
10 Storage of films
Annex A (normative) Preparation of standard solution of
                    tetrabutylammonium hydroxide
Annex B (informative) Numbering system for related International Standards
Annex C (informative) Effect of residual compounds on the thermally
                      processed silver image
Annex D (informative) Accelerated image stability test for thermally
                      processed silver microfilms
Annex E (informative) Bibliography

Addresses the specifications for the stability of photographic films intended for storage of records; microfilms, with a base of safety polyester [poly(ethylene terephthalate)] having predominantly silver behenate salts dispersed in nongelatinous emulsions, and thermally processed to produce a black-and-white silver image. Applicable to thermally processed silver (TPS) microfilms having dielectric or ultrasonic (induction-heated) splices. But not films with splices made by adhesive tape or other types of black and white TPS films, paper, colour prints and images produced with thermally processed silver behenate systems or films with lacquers applied.

This International Standard establishes specifications for the stability of photographic films intended for storage of records; specifically, microfilms with a base of safety polyester [poly(ethylene terephthalate)] having predominantly silver behenate salts dispersed in nongelatinous emulsions, and thermally processed to produce a black-and-white silver image.

This International Standard applies to thermally processed silver (TPS) microfilms having ultrasonic or dielectric (induction-heated) splices. It does not cover films with splices made by means of adhesive tape.

This International Standard does not cover other types of black-and-white TPS films, black-and-white paper, colour images and colour prints that are produced with thermally processed silver behenate systems.

It does not apply to films to which lacquers have been applied.

It also does not apply to conventional black-and-white silver images that are produced by wet processing of silver-gelatin films (see ISO10602).