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419931

Sigma-Aldrich

Filter agent

Celite® 545

Synonym(s):

Diatomaceous earth, flux-calcined

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About This Item

CAS Number:
68855-54-9
MDL number:
MFCD00132803
UNSPSC Code:
11101527
PubChem Substance ID:
329756171
NACRES:
SB.54
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form

powder

Quality Level

100

manufacturer/tradename

Celite® 545

parameter

4.0 (Permeability(Darcy))

SMILES string

O=[Si]=O

InChI

1S/O2Si/c1-3-2

InChI key

VYPSYNLAJGMNEJ-UHFFFAOYSA-N

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General description

Filter agent (diatomaceous earth) is made up of natural amorphous silica formed from the fossilized skeletons of diatoms.[1] It is extracted, crushed, dried and calcined with or without flux material. DE is widely used as filler in construction materials, paints and as anti-caking agent for agricultural chemicals.[2] It has high water and oil absorption ability.[1] The potential toxicity of different samples of DE has been assessed.[3]

Application

Filter agent (diatomaceous earth) may be used in the following processes:
  • As an adsorbent for column chromatography.[4]
  • Synthesis of chitosan modified diatomaceous earth for the abstraction of humic acid from raw water.[5]
  • Synthesis of porous silica ceramics.[6]

Legal Information

Celite is a registered trademark of Imerys Minerals California, Inc.

Pictograms

Health hazard
GHS08

Signal Word

Danger

Hazard Statements

H372

Precautionary Statements

P260 - P264 - P270 - P314 - P501

Hazard Classifications

STOT RE 1 Inhalation

Target Organs

Lungs

Storage Class Code

6.1D - Non-combustible acute toxic Cat.3 / toxic hazardous materials or hazardous materials causing chronic effects

WGK

WGK 1

Flash Point(F)

Not applicable

Flash Point(C)

Not applicable

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Certificates of Analysis (COA)

Lot/Batch Number
MKCX0696
MKCW3873
MKCW3871
MKCV5563
MKCT3947

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Porous ceramic monoliths based on diatomite.
Saponjic A, et al.
Ceramics International, 41(8) , 9745-9752 (2015)
Study on Adsorption Removal of Humic Acid in Water by Modified Clays.
Wang YH, et al.
Applied Mechanics and Materials, 707, 247-250 (2015)
The global variability of diatomaceous earth toxicity: a physicochemical and in vitro investigation.
Nattrass C, et al.
Journal of Occupational Medicine and Toxicology (London, England), 10(1), 25-25 (2015)
Manipulating surface wettability and oil absorbency of diatomite depending on processing and ambient conditions.
Ozen I, et al.
Applied Surface Science, 332, 22-31 (2015)
H Checkoway et al.
British journal of industrial medicine, 50(7), 586-597 (1993-07-01)
A cohort mortality study was conducted among workers from two plants in the diatomaceous earth mining and processing industry in California. Diatomaceous earth consists of the skeletal remains of diatoms. Exposure to amorphous (non-crystalline) and crystalline silica in the form
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Questions

1–3 of 3 Questions  

  1. How is shipping temperature determined? And how is it related to the product storage temperature?

    1 answer

    1. 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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  2. How can I determine the shelf life / expiration / retest date of this product?

    1 answer

    1. 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

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  3. What is the particle size range for (part # 419931)?

    1 answer

    1. The particle size range is 0.02-0.1 mm.

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