Grade 920 for construction
Elkem Microsilica® Grade 920 is dry silica fume available in two main forms:
- Undensified — 920 U, with a typical bulk density of 200 -350 kg/m3
- Densified — 920 D, with a typical bulk density of 500 -700 kg/m3
The products are supplied in a range of packaging:
- 25 kg paper bags
- Big bags in a variety of designs and sizes depending on product and production plant.
- Bulk in road tanker
Special packaging can be supplied on request.
Elkem Materials is certified according to ISO 9001.
The chemical composition and physical properties are regularly tested in accordance with international standards.
Conformance to Standards
Elkem Microsilica® Grade 920 conforms to the mandatory requirements of the relevant standards from:
- American Society for Testing and Materials
- European Committee for Standardisation
- Canadian Standards j Association
|Mandatory chemical and physical requirements||ASTM С1240 — 03||prEN 13263||САN/СSА23.5 — 98|
|SiO2||> 85,0||400 MT||> 85||weekly||> 85||500 MT|
|SO3||< 2,0||weekly||< 1,0||1000 MT|
|CI (%)||< 0,3||weekly|
|Free CaO (%)||< 1,0||weekly|
|Free Si (%)||< 0,4||monthly|
|Alkalies (as equivalent Na2O, %)||Report||400 MT|
|Moistur (%)||< 3,0||400 MT|
|Loss on lgnition, LOI (%)||< 6,0||400 MT||<4,0||weekly||<6,0||500 MT|
|Specific surface (BET- m2/gram))||> 15||3200 MT/3 months||> 15 & <35||monthly|
|Bulk density (kg/m3) — undensified||Report||400 MT|
|Pozz. Activity Index (%) — 7 days accelerated curing||> 105||$3200 MT/3 months|
|Pozz. Activity Index (%) — 28 days normal curing||> 100||monthly|
|Retained on 45 micron sieve (%)||< 10||400 MT||< 10||100 MT|
|Variation from avg. retained on 45 micron (%-points)||< 5||avg. of last 10 tests|
|Density (kg/m3)||Report||400 MT|
|Autoclave expansion or contraction (%)||< 0,2||1000 MT|
|Foaming||No foam||1000 MT|
The information given on this datasheet is accurate to the best knowledge of Elkem Materials. The information is offered without guarantee, and Elkem Materials accepts no liability for any direct or indirect damage from its use. The information is subject to change without notice. For latest update or further information or assistance, please contact your local representative, the Internet address or the e-mail address given on this datasheet.