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
U5128
Urea
ACS reagent, 99.0-100.5%
Synonym(s):
Carbamide, Carbonyldiamide
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About This Item
99.0-100.5%
Recommended Products
grade
ACS reagent
Quality Level
Assay
≤0.001% (Heavy Metals by ICP-OES, metals basis)
99.0-100.5%
form
solid
impurities
≤0.01% Insoluble matter
ign. residue
≤0.01%
mp
132-135 °C (lit.)
solubility
H2O: soluble 480 g/L at 20 °C
density
1.335 g/mL at 25 °C (lit.)
anion traces
chloride (Cl-): ≤5 ppm
sulfate (SO42-): ≤0.001%
cation traces
Fe: ≤0.001%
functional group
amine
SMILES string
NC(N)=O
InChI
1S/CH4N2O/c2-1(3)4/h(H4,2,3,4)
InChI key
XSQUKJJJFZCRTK-UHFFFAOYSA-N
Gene Information
human ... CA1(759) , CA2(760)
rat ... Ppm1a(24666)
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General description
Application
- to adjust the urea nitrogen concentration to a preferred range in blood reservoir for evaluating the dialyzer urea clearance[2]
- to prepare standards to measure urea synthesis[3]
- to prepare standards for blood urea nitrogen assay[4]
Biochem/physiol Actions
Storage Class Code
11 - Combustible Solids
WGK
WGK 1
Flash Point(F)
Not applicable
Flash Point(C)
Not applicable
Personal Protective Equipment
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How is shipping temperature determined? And how is it related to the product storage temperature?
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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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