NBN EN 27490 : 1992

Cooperating organizations
National foreword
Foreword
1. Scope
2. Normative references
3. Classification
4. Requirements
5. Sampling
6. Test conditions and preparation of test specimens
7. Test methods
8. Information to be supplied by manufacturer
9. Packaging
10. Marking
Annexes
A. (informative) Apparatus for measuring setting
     expansion
B. (informative) Apparatus for measuring thermal
     expansion
Tables
1. Compressive strength
2. Total expansion
Figures
1. Slump test apparatus in brass or stainless steel
2. Vicat test specimen holder
3. Arrangement of mesio-occluso-distal inlay pattern
     and liner in casting ring
A.1 Setting expansion apparatus fitted with linear
     transducer
A.2 Specimen container for measuring setting expansion
A.3 Detail illustrating how to apply controlled measuring
     force
B.1 Thermal expansion apparatus
National annexes
NA. (informative) Committees responsible
NB. (informative) Cross-references

Specifies requirements for, and a classification of, gypsum-bonded casting investments together with test methods to be used to determine compliance with these requirements. Applies to gypsum-bonded investments suitable for casting dental gold alloy which have liquid temperatures not more than 1080 Degrees C. Coverage includes: classification, sampling, packaging and marking. Also includes annexes, tables and diagrams.