If this product has an expiration or retest date, it will be shown on the Certificate of Analysis (COA, CofA). If there is no retest or expiration date listed on the product's COA, we do not have suitable stability data to determine a shelf life. For these products, the only date on the COA will be the release date; a retest, expiration, or use-by-date will not be displayed.
For all products, we recommend handling per defined conditions as printed in our product literature and website product descriptions. We recommend that products should be routinely inspected by customers to ensure they perform as expected.
For products without retest or expiration dates, our standard warranty of 1 year from the date of shipment is applicable.
For more information, please refer to the Product Dating Information document: https://www.sigmaaldrich.com/deepweb/assets/sigmaaldrich/marketing/global/documents/449/386/product-dating-information-mk.pdf
Wichtige Dokumente
342890
Siliziumdioxid
−325 mesh, 99.5% trace metals basis
Synonym(e):
Cristobalit, Kieselgel, Quarz, Seesand
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About This Item
Empfohlene Produkte
Qualitätsniveau
Assay
99.5% trace metals basis
Form
powder
Brechungsindex
n20/D 1.544 (lit.)
Partikelgröße
−325 mesh
mp (Schmelzpunkt)
1610 °C (lit.)
Dichte
2.6 g/mL at 25 °C (lit.)
Anwendung(en)
battery manufacturing
SMILES String
O=[Si]=O
InChI
1S/O2Si/c1-3-2
InChIKey
VYPSYNLAJGMNEJ-UHFFFAOYSA-N
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Verwandte Kategorien
Anwendung
Sonstige Hinweise
Lagerklassenschlüssel
13 - Non Combustible Solids
WGK
nwg
Flammpunkt (°F)
Not applicable
Flammpunkt (°C)
Not applicable
Persönliche Schutzausrüstung
dust mask type N95 (US), Eyeshields, Gloves
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How can I determine the shelf life / expiration / retest date of this product?
1 Antwort-
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How is shipping temperature determined? And how is it related to the product storage temperature?
1 Antwort-
Products may be shipped at a different temperature than the recommended long-term storage temperature. If the product quality is sensitive to short-term exposure to conditions other than the recommended long-term storage, it will be shipped on wet or dry-ice. If the product quality is NOT affected by short-term exposure to conditions other than the recommended long-term storage, it will be shipped at ambient temperature. As shipping routes are configured for minimum transit times, shipping at ambient temperature helps control shipping costs for our customers. For more information, please refer to the Storage and Transport Conditions document: https://www.sigmaaldrich.com/deepweb/assets/sigmaaldrich/marketing/global/documents/316/622/storage-transport-conditions-mk.pdf
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Is it(342890) porous silica? I want to know the specific surface area and particle size distribution(dispersity) (Batch number is MKCT1789)
1 Antwort-
The quality specifications for product no. 342890-100G Silicon dioxide do not include a determination of its specific surface area. Our supplier does characterize the product as porous silica.
As the Certificate of Analysis for lot MKCT1789 shows, the mean particle size is 2.08 microns. Detailed QC testing shows:
Diameter at 10%: 0.45 microns
Diameter at 50%: 2.06 microns
Diameter at 90%: 3.88 micronsFuture lots of the product might vary in their particle size characteristics within the quality specification of being no larger than 45.00 microns.
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