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
P6148
Paraformaldehyd
reagent grade, crystalline
Synonym(e):
Polyoxymethylen
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About This Item
Empfohlene Produkte
Qualität
reagent grade
Qualitätsniveau
Dampfdichte
1.03 (vs air)
Dampfdruck
<1.45 mmHg ( 25 °C)
Form
crystalline
Selbstzündungstemp.
572 °F
Expl.-Gr.
73 %
mp (Schmelzpunkt)
120-170 °C (lit.)
Dichte
0.88 g/mL at 25 °C (lit.)
Lagertemp.
2-8°C
SMILES String
[O-]#[C+H2]
InChI
1S/CH2O/c1-2/h1H2
InChIKey
WSFSSNUMVMOOMR-UHFFFAOYSA-N
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Allgemeine Beschreibung
Anwendung
Ähnliches Produkt
Signalwort
Danger
Gefahreneinstufungen
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
Zielorgane
Respiratory system
Lagerklassenschlüssel
4.1B - Flammable solid hazardous materials
WGK
WGK 2
Flammpunkt (°F)
Not applicable
Flammpunkt (°C)
Not applicable
Persönliche Schutzausrüstung
Eyeshields, Faceshields, Gloves, type P3 (EN 143) respirator cartridges
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Artikel
Available Fluorescent in situ hybridization (FISH) procedures, reagents and equipment.
Verfügbare Verfahren zur Fluoreszenz-in-situ-Hybridisierung (FISH), Reagenzien und Ausstattung.
Protokolle
Cell staining can be divided into four steps: cell preparation, fixation, application of antibody, and evaluation.
Verwandter Inhalt
Three-dimensional (3D) printing of biological tissue is rapidly becoming an integral part of tissue engineering.
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How can I determine the shelf life / expiration / retest date of this product?
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Helpful?
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How is shipping temperature determined? And how is it related to the product storage temperature?
1 answer-
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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What is the difference between formaldehyde and paraformaldehyde?
1 answer-
Paraformaldehyde is the polymeric form of formaldehyde. It is a solid. Formaldehyde is a gas which when dissolved in water gives a formaldehyde solution. Commercially available formaldehyde solutions usually contain 10-15% methanol, which prevents the formaldehyde from forming the polymeric paraformaldehyde.
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How to prepare solutions of Product P6148, Paraformaldehyde?
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Paraformaldehyde does not dissolve but rather can be depolymerized in solution. Depolymerized solutions can be prepared in water with heating to 55-60°C. If necessary, further addition of 1-2 drops of a sodium hydroxide solution may be required. Some protocols suggest that paraformaldehyde should be prepared in buffered solutions such as phosphate buffer or PBS at approximately pH 7.
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What is the Department of Transportation shipping information for this product?
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Transportation information can be found in Section 14 of the product's (M)SDS.To access the shipping information for this material, use the link on the product detail page for the product.
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How stable are Product P6148, Paraformaldehyde, solutions?
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Buffered solutions of 2-4% can be stored protected from light for 2-3 weeks at 2-8°C.
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What is the shelf life of Product P6148, Paraformaldehyde?
1 answer-
The shelf life has not been assigned but guarantee of quality is 1 year from the time of receipt for unopened bottles stored at 2-8 °C. We expect the product to be of good quality for at least 2 years.
Helpful?
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What is the difference between formaldehyde and paraformaldehyde?
1 answer-
Paraformaldehyde is the polymeric form of formaldehyde. Paraformaldehyde is a solid, and formaldehyde is a gas. Formaldehyde solutions consist of formaldehyde gas dissolved in a solvent of some kind.
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