{"id":43770,"date":"2023-11-02T13:48:53","date_gmt":"2023-11-02T05:48:53","guid":{"rendered":"https:\/\/www.newtopchem.com\/?p=43770"},"modified":"2023-11-02T13:48:53","modified_gmt":"2023-11-02T05:48:53","slug":"costron-formerly-bayer-desmodur-44c-pure-mdi-101-68-8","status":"publish","type":"post","link":"http:\/\/www.newtopchem.com\/archives\/43770","title":{"rendered":"Costron (formerly Bayer) Desmodur 44C Pure MDI 101-68-8","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Product Description
\nDESMODUR 44C is a 4,4\u2032-diphenylmethane diisocyanate monomer with a molecular weight of 250 and is a colorless to light yellow solid at room temperature. This product is mainly used in the production of polyurethane products.<\/h4>\n

<\/h4>\n

Sampling
\nPrevent the product from coming into contact with water vapor during sampling.<\/h4>\n

<\/h4>\n

Specification<\/h4>\n

Item<\/h4>\n

Indicator<\/h4>\n

Unit<\/h4>\n

Test Method<\/h4>\n

2,4\u2032-MDI content<\/h4>\n

\u22641.8<\/h4>\n

% of<\/h4>\n

20110367601-92<\/h4>\n

Hydrolyzed chloride content<\/h4>\n

\u226450<\/h4>\n

ppm<\/h4>\n

2011-0339304-95<\/h4>\n

Dimer content*<\/h4>\n

\u22640.1<\/h4>\n

% of<\/h4>\n

2012-0346901-92<\/h4>\n

<\/h4>\n

Typical properties<\/h4>\n

Item<\/h4>\n

Indicator<\/h4>\n

Unit<\/h4>\n

Test method<\/h4>\n

Purity (molecular weight 250)<\/h4>\n

\u226599.5<\/h4>\n

% of<\/h4>\n

2011-0248603-94<\/h4>\n

NCO content (theoretical value)<\/h4>\n

33.6<\/h4>\n

% of NCO content (theoretical value)<\/h4>\n

\u2013<\/h4>\n

Phenyl isocyanate content<\/h4>\n

\u226410<\/h4>\n

ppm<\/h4>\n

2011-0339304-95<\/h4>\n

Viscosity (40\u2103)<\/h4>\n

0.1<\/h4>\n

mPa.s<\/h4>\n

2011-0313703-95<\/h4>\n

Density (40\u2103)<\/h4>\n

1.19<\/h4>\n

g\/cm\u00b3<\/h4>\n

DIN 51757<\/h4>\n

Specific heat (cp)<\/h4>\n

Approx. 1.39<\/h4>\n

kJ\/kg.K<\/h4>\n

<\/h4>\n

Heat of dissolution<\/h4>\n

Approx. 102<\/h4>\n

J\/g<\/h4>\n

<\/h4>\n

<\/h4>\n

Packaging
\nDESMODUR 44C is available in two ways:
\n\u2013 Liquid (tanker truck)
\n\u2013 Solid (in drums, net weight 225 kg)<\/h4>\n

<\/h4>\n

Storage<\/h4>\n

Recommended storage temperature (\u00b0C)<\/h4>\n

<5 (solid), 43\u00b12 (liquid)<\/h4>\n

Shelf life<\/h4>\n

\u22643 months (solid), \u22643 weeks in tank (liquid) if kept in closed, drained condition<\/h4>\n

<\/h4>\n

\"\"<\/h4>\n

Handling Recommendations
\nLike all isocyanates, DESMODUR 44C is very sensitive to water and reacts with water to produce insoluble urea and carbon dioxide. In a closed container, the carbon dioxide produced can cause a dangerous rise in container pressure.
\nExposure of DESMODUR 44C to air, especially sunlight, accelerates yellowing. It is therefore recommended that liquid DESMODUR 44C be stored in a dry nitrogen atmosphere. yellowing will not normally affect the processability of the product.
\nDESMODUR 44C is heat sensitive and can form dimers. DESMODUR 44C in the solid state is more susceptible to dimerization at room temperature than in the liquid state at 45\u00b0C. For this reason, it is important to store DESMODUR 44C in the solid state at room temperature. Therefore, solid products should be stored below 5\u00b0C and melted gradually and rapidly before use. Although the rate of dimerization of the product decreases with decreasing temperature, the stability is still limited even at temperatures below 5\u2103.
\nSolid DESMODUR 44C needs to be heated to \u226570\u00b0C for melting, a process that will increase the formation of insoluble dimers and possibly deform the drum due to increased pressure at increased temperatures.<\/h4>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

Product Description DESMODUR 44C is a 4,4\u2032-diphenylmeth…<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":43771,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[14240],"tags":[14807],"gt_translate_keys":[{"key":"link","format":"url"}],"_links":{"self":[{"href":"http:\/\/www.newtopchem.com\/wp-json\/wp\/v2\/posts\/43770"}],"collection":[{"href":"http:\/\/www.newtopchem.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.newtopchem.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.newtopchem.com\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.newtopchem.com\/wp-json\/wp\/v2\/comments?post=43770"}],"version-history":[{"count":1,"href":"http:\/\/www.newtopchem.com\/wp-json\/wp\/v2\/posts\/43770\/revisions"}],"predecessor-version":[{"id":43772,"href":"http:\/\/www.newtopchem.com\/wp-json\/wp\/v2\/posts\/43770\/revisions\/43772"}],"wp:featuredmedia":[{"embeddable":true,"href":"http:\/\/www.newtopchem.com\/wp-json\/wp\/v2\/media\/43771"}],"wp:attachment":[{"href":"http:\/\/www.newtopchem.com\/wp-json\/wp\/v2\/media?parent=43770"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.newtopchem.com\/wp-json\/wp\/v2\/categories?post=43770"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.newtopchem.com\/wp-json\/wp\/v2\/tags?post=43770"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}