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/418/501/product-dating-information-06-25-mk.pdf
441244
Paraformaldehyde
prilled, 95%
Synonym(s):
Polyoxymethylene
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About This Item
vapor density
1.03 (vs air)
Quality Segment
vapor pressure
<1.45 mmHg ( 25 °C)
assay
95%
form
prilled
autoignition temp.
572 °F
expl. lim.
73 %
mp
120-170 °C (lit.)
transition temp
sublimation point 150 °C
solubility
alcohol and cold water: slightly soluble, ethers, hydrocarbons and carbon tetrachloride: insoluble
density
0.88 g/mL at 25 °C (lit.)
SMILES string
[O-]#[C+H2]
InChI
1S/CH2O/c1-2/h1H2
InChI key
WSFSSNUMVMOOMR-UHFFFAOYSA-N
General description
Paraformaldehyde is also referred as polyoxymethylene. It participates in the regioselective reductive coupling reactions of dienes, alkynes and allenes in the presence of ruthenium catalyst.[1] It also participates in the synthesis of esters, via alkoxycarbonylation of alkenes.
Application
Features and Benefits
Decomposes in hot water to give formaldehyde.
1 of 1
This Item | |||
|---|---|---|---|
| assay 95% | assay 95% | assay 95.0-100.5% | assay ≥95% (acidimetric) |
| Quality Level 200 | Quality Level 200 | Quality Level 200 | Quality Level 200 |
| solubility alcohol and cold water: slightly soluble, ethers, hydrocarbons and carbon tetrachloride: insoluble | solubility - | solubility water: insoluble | solubility - |
| mp 120-170 °C (lit.) | mp 120-170 °C (lit.) | mp 120-170 °C (lit.) | mp 100-130 °C |
| density 0.88 g/mL at 25 °C (lit.) | density 0.88 g/mL at 25 °C (lit.) | density 0.88 g/mL at 25 °C (lit.) | density 1.4 g/cm3 at 20 °C |
| form prilled | form powder | form powder | form solid |
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signalword
Danger
Hazard Classifications
Acute Tox. 4 Inhalation - Acute Tox. 4 Oral - Carc. 1B - Eye Dam. 1 - Flam. Sol. 2 - Muta. 2 - Skin Irrit. 2 - Skin Sens. 1 - STOT SE 3
target_organs
Respiratory system
Storage Class
4.1B - Flammable solid hazardous materials
wgk
WGK 2
flash_point_f
Not applicable
flash_point_c
Not applicable
ppe
Eyeshields, Faceshields, Gloves, type P3 (EN 143) respirator cartridges
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How can I determine the shelf life / expiration / retest date of this product?
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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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