The recommended storage temperature is -20°C; this product should be returned to the freezer after use to preserve quality. Prolonged exposure to higher temperatures can cause degradation. The melting point of this product is between 37°C and 45°C, so leaving it at room temperature will not liquefy it. To liquefy, use a controlled heat source such as a water bath set between 60°C and 80°C.
33428
4,4′-MDI
analytical standard
Synonym(s):
4,4′-Methylenebis(phenyl isocyanate), 4,4′-Diphenylmethane diisocyanate, 4,4′-Methylenediphenyl diisocyanate, 4,4′-MDI, Bis(4-isocyanatophenyl)methane
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| Size/SKU | Availability | Price |
|---|---|---|
100 mg | Available to ship TODAYfromMILWAUKEE | $93.50 $79.47 |
About This Item
Linear Formula:
CH2(C6H4NCO)2
CAS Number:
Molecular Weight:
250.25
UNSPSC Code:
41116107
NACRES:
NA.24
PubChem Substance ID:
EC Number:
202-966-0
Beilstein/REAXYS Number:
797662
MDL number:
$79.47
List Price$93.50Save 15%Web-Only Promotion
Available to ship TODAYDetails
grade
analytical standard
Quality Segment
shelf life
limited shelf life, expiry date on the label
technique(s)
HPLC: suitable, chromatography: suitable, gas chromatography (GC): suitable
bp
200 °C/5 mmHg (lit.)
mp
42-45 °C (lit.)
density
1.18 g/mL at 25 °C (lit.)
application(s)
environmental
format
neat
storage temp.
−20°C
SMILES string
O=C=Nc1ccc(Cc2ccc(cc2)N=C=O)cc1
InChI
1S/C15H10N2O2/c18-10-16-14-5-1-12(2-6-14)9-13-3-7-15(8-4-13)17-11-19/h1-8H,9H2
InChI key
UPMLOUAZCHDJJD-UHFFFAOYSA-N
General description
This substance is listed on the positive list of the EU regulation 10/2011 for plastics intended to come into contact with food.
4,4′-MDI can be extensively used to make urethane elastomers and urethane coatings.
Application
4,4′-MDI may be used as an analytical standard for the determination of the analyte in wastewater and air samples, and human biological samples by various chromatographic techniques.
Refer to the product′s Certificate of Analysis for more information on a suitable instrument technique. Contact Technical Service for further support.
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This Item | |||
|---|---|---|---|
| description analytical standard | description 98% | description analytical standard | description 90% |
| application(s) environmental | application(s) - | application(s) cleaning products | application(s) - |
| technique(s) HPLC: suitable, gas chromatography (GC): suitable | technique(s) - | technique(s) HPLC: suitable, gas chromatography (GC): suitable | technique(s) - |
| format neat | format - | format neat | format - |
| Quality Level 100 | Quality Level 200 | Quality Level 100 | Quality Level 200 |
| grade analytical standard | grade - | grade analytical standard | grade - |
| storage temp. −20°C | storage temp. −20°C | storage temp. - | storage temp. - |
Signal Word
Danger
Hazard Codes
Precautionary Statements
Hazard Classifications
Acute Tox. 4 Inhalation - Carc. 2 - Eye Irrit. 2 - Resp. Sens. 1 - Skin Irrit. 2 - Skin Sens. 1 - STOT RE 2 Inhalation - STOT SE 3
Target Organs
Respiratory system
Storage Class
11 - Combustible Solids
WGK
WGK 1
Flash Point (°F)
411.8 °F - closed cup
Flash Point (°C)
211 °C - closed cup
PPE (personal protective equipment)
dust mask type N95 (US), Eyeshields, Faceshields, Gloves
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posso deixar o produto fora do freezer? ou sempre depois que eu terminar de utilizar tenho que colocar novamente no congelador? como faço para ele ficar liquído, apenas deixando fora do congelador ou tenho que aquece?
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How can I determine the shelf life / expiration / retest date of this product?
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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.pdfHelpful?
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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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