Kieselguhr purified and calcined GR for analysis


Kieselguhr (diatomite, infusorial earth) is the fossilized skeletons of diatom algae. It is mainly made up of silica with many unique features like high porosity, small particle size, low density and thermal conductivity. It is primarily utilized as a source to manufacture filter aids, fire-bricks and adsorbents. Kieselguhr is the main component of the Berkefeld filter used for purifying water. It is also utilized in the filtration process of beer brewing.

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Product Information
CAS number 68855-54-9
EC number 272-489-0
Grade Reag. Ph Eur
HS Code 3802 90 00
Quality Level MQ100


Kieselguhr (infusorial earth) may be used in the following processes:
• Estimation of total fats.
• As a catalyst in the synthesis of ketones and aldehydes via oxidation of corresponding oximes with manganese dioxide.
• Green synthesis of β-nitroalkenes via Michael addition of 1,3-dicarbonyl compounds, by a grinding method in the absence of solvent and catalyst.
• Preparation of KMnO4-kieselguhr reagent for use in the oxidation of primary alcohols to aldehydes with shorter reaction time.Used for greener amide bond formation from amines and carboxylic acids after thermal activation at high temperature.


Physicochemical Information
Density 2.36 g/cm3 (20 °C)
Melting Point >450 °C
pH value 10 (100 g/l, H₂O, 20 °C)
Bulk density 300 kg/m3
Solubility 0.0037 g/l


Safety Information according to GHS
Hazard Pictogram(s) Hazard Pictogram(s)
Hazard Statement(s) H372: Causes damage to organs through prolonged or repeated exposure if inhaled.
Precautionary Statement(s) P260: Do not breathe dust.
P314: Get medical advice/ attention if you feel unwell.
Signal Word Danger
Storage class 6.1 D Non combustible, acute toxicity cat. 3 / toxic or substances with chronic effects
WGK NWG not water endangering
Disposal 3
Relatively unreactive organic reagents should be collected in container A. If halogenated, they should be collected in container B. For solid residues use container C.


Safety Information
Categories of danger harmful


Storage and Shipping Information
Storage Storage temperature: no restrictions.


Identity passes test
Substances soluble in hydrochloric acid ≤ 1.0 %
pH-value (10 %; water) 5 – 9
Chloride (Cl) ≤ 0.01 %
Sulphate (SO₄) ≤ 0.02 %
Fe (Iron) ≤ 0.05 %
Heavy metals (as Pb) ≤ 0.01 %
Loss on ignition (980 °C) ≤ 0.2 %
Particle size (< 0.1 mm) about 98
Bulk density about 20

Additional information


250g, 1 kg


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