Tdi izocianát

Iparilag fontos monofunkciós izocianát a metil-izocianát (MIC), melyet peszticidek gyártása során használnak fel.. 2000-ben a diizocianátok világpiaci mennyisége 4,4 millió tonna volt, ennek 61,3%-a metilén-difenil-diizocianát (MDI), 34,1%-a toloul-diizocianát (TDI), 3,4%-a hexametilén-diizocianát (HDI) és izoforon-diizocianát (IPDI), a többi vegyület részesedése. Toluene Diisocyanate. Toluene di isocyanate (TDI) is an organic compound with the formula CH3C6H3(NCO)2. Two of the six possible isomers are commercially important: 2,4-TDI (CAS: 584-84-9) and 2,6-TDI (CAS: 91-08-7). 2,4-TDI is produced in the pure state, but TDI is often marketed as 80/20 and 65/35 mixtures of the 2,4 and 2,6 isomers respectively TDI 80 : contains 80 % of 2,4 isomer and 20% of 2,6; TDI 100 : contains 99 % of 2,4 isomer; The two principal isomers of TDI are classified as 2.4-toluene diisocyanate and 2.6-toluene diisocyanate. TDI is used to produce foams for cushioning material, furniture, bedding, seating or as carpet underlay and packaging

Toluene Diisocyanate (TDI) BASF's Lupranat ® T 80 is a mixture of 80% 2,4-isomer and 20% 2,6-isomer of Toluene Diisocyanate (TDI). Lupranat ® T 80 is used for the production of slabstock and molded foam as well as for various CASE applications. Product. NCO (%) Viscosity [mPa*s] Viscosity Temperature [°C] Description Hazards of Isocyanates (TDI, MDI, HDI) In Resins, Coatings and Paints. Polyurethanes are polymers that are formed by reacting an isocyanate, like TolueneDiIsocyanate , Methylene Bisphenyl Isocyanate or Hexamethylene Di Isocyanate (also referred to as HDI) and alcohol. These polymers are used to make foam padding for mattresses and seat cushions.

Toluol-2,4-diisocyanat (TDI) ist eines der wichtigsten Isocyanate und ein wichtiges Zwischenprodukt der Kunststoffindustrie. Ende der 1930er Jahre erwies sich die Verbindung neben anderen Isocyanaten als eine ideale Ausgangssubstanz für Polyadditionsreaktionen und wurde von Otto Bayer und seinen Mitarbeitern in Leverkusen als aussichtsreiches Produkt für die Herstellung von Schaumstoffen. Isocyanates prices, markets & analysis. Get the latest data, tools and insight for isocyanates like methylene diphenyl diisocyanate (MDI) and toluene di-isocyanate (TDI) with ICIS pricing and market intelligence. Our short-to-long-term solutions - from pricing, analytics, industry news and supply and demand data - ensure that you can. The International Isocyanate Institute, Inc. (III) was founded in August 1972 as a scientific research organization supporting the diisocyanates industry. It is organized and operated as a not-for-profit corporation under the laws of the State of New York, USA. The Head Office is in Mountain Lakes, New Jersey, USA Le diisocyanate de toluène (TDI ) se retrouve sous deux formes isomériques, soit le 2,4-TDI et le 2,6-TDI. Le CAS (26471-62-5) correspond à l'appellation TDI générique. Il peut être utilisé pour tous mélanges des deux isomères. Le mélange commercial le plus couramment utilisé est composé à 80 % de 2,4-TDI et à 20 % de 2,6-TDI TDI by BASF is an 80:20 mixture of the 2,4- and 2,6-TDI isomers assaying 99.5% TDI minimum, as shown in Figure 3. TDI is produced in several grades that differ slightly in acidity and hydrolyzable chloride content. Increased acidity of TDI allows broader processing latitude in some applications. Type I is used in flexible sla

Izocianátok - Wikipédi

  1. Types of TDI 15 Test substances 16 Misapprehensions 16 Polyurethanes made from MDI and TDI 17 Reading 23 2 Handling MDI and TDI 25 D C Allport, R C Blake, C Bastian, C Galavitz, D S Gilbert, R Hurd, B Reeve, W Robert, S M Outterside, A Solinas, D Walsh, U Walber and H Wolfson Pride in safety 25 Successful systems 25 Safety systems for the.
  2. Toluene diisocyanate exists in two isomeric forms (2,4-toluene diisocyanate and 2,6-toluene diisocyanate) which have similar properties and effects.Toluene diisocyanate is produced commercially as an 80:20 (2,4-toluene diisocyanate:2,6-toluene diisocyanate) mixture of the two isomers.At room temperature, the mixture is a clear, pale yellow liquid with a sharp, pungent odor
  3. Tolylene-2,4-diisocyanate 95%; CAS Number: 584-84-9; EC Number: 209-544-5; Synonyms: 2,4-Diisocyanatotoluene,4-Methyl-m-phenylene diisocyanate,TDI,BASF LUPRANATE T80,4-Methyl-1,3-phenylene diisocyanate; Linear Formula: CH3C6H3(NCO)2; find Sigma-Aldrich-T39853 MSDS, related peer-reviewed papers, technical documents, similar products & more at Sigma-Aldric
  4. Inhalation is the relevant route of human exposure for TDI and the toxicokinetics of TDI exposure at occupational exposure limits have been studied. These data provide a means by which quantitative estimates of the risk of carcinogenicity possibly resulting from the intermediate formation of TDA during TDI exposure can be obtained

Toluene diisocyanate 1. NAME 1.1 Substance Toluene-2,4-diisocyanate (TDI) Toluene-2,6-diisocyanate 1.2 Group Isocyanates 1.3 Synonyms 2,4-diisocyanatotoluene benzene-2,4-diisocyanate-l-methyl TDI isocyanic acid Di-isocyanate de 2,4-Tollylene (French) 2,4-Toluylendiisocyanate (German) Toluen-diisocianato (Italian) Toluen-Diisocyanaat (Dutch) Di-iso-cyanotaluene methyl-m-phenylene ester. The largest isocyanate-consuming region is the Asia-Pacific region. China is the largest MDI consumer. The global MDI and TDI markets are expected to grow at an annual average rate of 5%. However, since spring 2019, China's prices for TDI have been coming off as demand continues to languish Production. Le TDI est produit industriellement en faisant réagir du diaminotoluène (en fait un mélange de 2,4-diaminotoluène et de 2,6-diaminotoluène dans un ratio 80:20) avec du phosgène (COCl 2), ce qui conduit au TDI avec une production secondaire de chlorure d'hydrogène HCl.. Formulation. Il est généralement commercialisé sous forme d'un mélange de 80 % de 2,4-diisocyanate de. Diphenylmethane diisocyanate (MDI) has a lower vapor pressure and is therefore less toxic than TDI. The synthesis of MDI starts with the condensation of aniline with formaldehyde as shown in Figure 2.6 for the ortho adducts. In fact, 2, 2 ′ - and 2, 4 ′ - and 4, 4 ′-isomers are formed, the yield of the dimer of 4, 4 ′-diphenylmethane diamine being in an amount of ca. 50%

Toluene diisocyanate - KH Chemical

TDI was the first commercially available isocyanate and is available as a mixture of 80% 2,4- and 20% 2,6-toluene diisocyanate isomers (Table 6.2), although they are also available as pure single isomers. Similarly, MDI has three isomers, namely 4,4′-, 2,4′- and 2,2′-diphenylmethane diisocyanate Tolulene diisocyanates (TDI) and related compounds are generally high production volume chemicals, meaning they are produced or imported in to the United States in quantities of 100 million pounds or more each year. These chemicals are predominantly used in the production of polyurethanes and consumer products, such as coatings, elastomers.

Toluene Diisocyanate TDI TDI100 Supplier

Isocyanates - BAS

Hazards of Isocyanates (TDI, MDI, HDI) In Resins, Coatings

  1. El diisocianato de tolueno es un compuesto orgánico de tipo diisocianato (por tener dos grupos isocianato,-N=C=O) aromático (por tener un anillo aromático).Su nombre es usualmente abreviado como TDI (de Toluen diisocianato).Tiene varios isómeros estructurales pero los más importantes comercialmente [2] son el 2,4-TDI (n°CAS: 584-84-9) y el 2,6-TDI (n°CAS: 91-08-7)
  2. Aromatic Isocyanate Doxu Fast Drying Polyurethane paint hardener TDI Trimer series HDX-50EA is mainly for high gloss wood paint and industrial paint, TDI monomer content <0.5%, if you're using Desmodur IL 1451, you will like our HDX-50EA
  3. Le diisocyanate de tolylène ou TDI se présente généralement sous forme d'un mélange d'isomères renfermant 80 % de 2,4-diisocyanate de toluylène et 20 % de 2,6-diisocyanate de toluylène [1, 2, 4, 6].. Sauf indication contraire, cette fiche traite du mélange TDI = (80 % 2,4-TDI) / (20 % 2,6-TDI)
  4. Polyurethan-Dynamik dank Vielseitigkeit. Polyurethan (PUR) zeichnet sich durch Langlebigkeit, Vielseitigkeit sowie Formstabilität aus. Dank seiner positiven Eigenschaften bietet dieser Kunststoff vielfältige Einsatzmöglichkeiten: Von der Bauindustrie über Schaumstoffe für Möbel und Matratzen, in Fahrzeugen sowie bei der Herstellung von Farben, Lacken, Klebstoffe und Dichtstoffen
  5. Isocyanate, insbesondere MDI und TDI, können eine allergische Reaktion des Typ I hervorrufen. Das sich dadurch entwickelnde Isocyanat-Asthma präsentiert sich ähnlich wie das klassische allergische Asthma, scheint jedoch etwas anderen molekularen Mechanismen zu unterliegen
  6. Products. Our product line of polyurethane raw materials consists of Lupranat ® aromatic isocyanates (MDI, MDI derivatives and TDI), Lupranol ® and Lupraphen ® polyols. Our materials are provided through direct sales and through distribution, and are available in bulk shipments (rail cars, tank trucks) as well as IBC and drums. Isocyanates

Vencorex is a world leader of aliphatic isocyanates (HDI, IPDI) and their derivatives and a key supplier of TDI aromatic isocyanate. Tolonate™ and Easaqua™ ranges of aliphatic isocyanates from Vencorex are specifically designed to be used in high performance polyurethane coatings for automotive (OEM and refinishing) applications, railway. Toluene diisocyanate 1. NAME 1.1 Substance Toluene-2,4-diisocyanate (TDI) Toluene-2,6-diisocyanate 1.2 Group Isocyanates 1.3 Synonyms 2,4-diisocyanatotoluene benzene-2,4-diisocyanate-l-methyl TDI isocyanic acid Di-isocyanate de 2,4-Tollylene (French) 2,4-Toluylendiisocyanate (German) Toluen-diisocianato (Italian) Toluen-Diisocyanaat (Dutch) Di-iso-cyanotaluene methyl-m-phenylene ester. TDI based Polyisocyanate. This hardener is aromatic isocyanate based polyisocyanates. It is applied to wood and adhesive . Product Inquir Toluene diisocyanate (TDI) is an organic compound with the formula CH3C6H3(NCO)2. Two of the six possible isomers are commercially important: 2, 4-TDI (CAS: 584-84-9) and 2, 6-TDI (CAS: 91-08-7). 2, 4-TDI is produced in the pure state, but TDI is often marketed as 80/20 and 65/35 mixtures of the 2, 4 and 2, 6 isomer spikes of 2,4-TDI, 2,6-TDI, and HDI were prepared. Because of the low vapor pressure of MDI, liquid spikes were prepared instead of vapor spikes. For 2,4-TDI, 3 concentrations ranging from 4.9 to 60 µg per sample yielded an average recovery of 90.5%. For 2,6-TDI, 3 concentrations ranging from 6.0 to 60 µg per sampl

Toluol-2,4-diisocyanat - Wikipedi

TDI is often seen commercially in its pure form. Therefore as it can be seen by its melting point (+20-22°C), it often solidifies when exposed to low ambient temperatures. It is also widely sold as a mixture (80% 2,4-TDI / 20% 2,6-TDI and 65% 2,4-TDI / 35% 2,6-TDI) where its melting point may be in the 12°C range The flash points and autoignition temperatures of MDI and TDI are relatively high. The table underneath shows the flammability properties for some grades of MDI and TDI. 4,4'-MDI PMDI 80/20 TDI 65/35 TDI Melting point oC 40 5 9.5 to 10 4 Boiling range oC >300 >300 252 to 254 253 to 255 Autoignition oC >601 >600 >595 >59 Below are examples of passive badges that may be used for sampling of MDI and TDI. MDI and TDI passive sampler (MORPHIX SafeAir) Colori metric badge - color reaction (of the badge) with isocyanate and (evaluated) measured using a color comparator. (measurement range - 2.5 to 200 ppb-hr for MDI & 2.5 to 700 ppb/hr for TDI tdi isocyanate manufacturer/supplier, China tdi isocyanate manufacturer & factory list, find qualified Chinese tdi isocyanate manufacturers, suppliers, factories, exporters & wholesalers quickly on Made-in-China.com

異氰酸酯是一類由異氰酸衍生出的酯,通式為R-N=C=O,是氰酸酯R-O-C≡N的異構體。 根據分子中酯基個數的不同,可分為單異氰酸酯、二異氰酸酯等。二異氰酸酯可用於生產聚氨酯。. 通常以少一個碳原子的胺為原料,通過與光氣反應引入異氰酸基。 實驗室中,異氰酸酯可通過醯基疊氮的Curtius重排反應. SGS Galson has ISO-CHEK® isocyanate-sampling kits available now, complete with sampling cassettes, derivatizing reagent, tweezers, sealing tape, special shipping boxes and an instruction sheet. To get yours, just call one of our Client Service Representatives at (888) 432-LABS (5227). This analysis is available on a standard 10 business day. TDI. BASF's Lupranate ® T80 isocyanate is a mixture of 80% 2,4-isomer and 20% 2,6-isomer of toluene diisocyanate (TDI). The Lupranate ® T80 Type-1 isocyanate is the industry standard for high-quality molded and slabstock foams. The slightly acidified,T80 Type-2 isocyanate is often used for specialty prepolymer synthesis and CASE applications Isocyanate de méthyl. H225 H361d H311 H330 H301 H334 H317 H335 H315 H318. MDI : mélange d'isomères avec 4,4'MDI (4,4′ diisocyanate de diphénylméthane)(> 97%) et une proportion variable de 2,4 MDI et 2,2 MDI. 4,4'MDI étiqueté. H351 H373 H332 H319 H335 H315 H334 H31

Isocyanates Prices, Markets & Analysis ICI

Welcome to the International Isocyanate Institute di

Fiche complète pour Diisocyanate de toluène (TDI) (mélange

Vegyipari folyékony hulladékok | Digitális Tankönyvtár

Product Stewardship. ISOPA represents the manufacturers of aromatic diisocyanates and polyols, the main raw materials for polyurethanes in Europe. On our website you will find information on who we are, what we do, and the benefits of our products and of polyurethanes to society. This website contains information on the environmental, health. Di-Isocyanate is used in the 2 pack PU Coatings effecting 90 - 95% of the Top Coats within the Super Yacht and Boating Industry! The restriction route to risk managing isocyanates (respiratory sensitizers that cause asthma and even more) is according to BAuA seen to be in the best interest of the Chemica Hai nhóm isocyanate trong TDI phản ứng với tốc độ khác nhau: Vị trí 4 phản ứng nhiều hơn khoảng bốn lần so với vị trí 2. 2,6-TDI là một phân tử đối xứng và do đó có hai nhóm isocyanate có khả năng phản ứng tương tự, tương tự như vị trí 2 trên 2,4-TDI

Toluene diisocyanate C9H6N2O2 - PubChe

Polyurethane feedstocks September 2020: Prices climb even higher / Strong demand and tight supply / Upswing likely to continue into October. 22.09.2020. POLYMER PRICES. Polyurethane feedstocks August 2020: Triple-digit hikes on strongly higher demand / Isocyanate output slowly normalises / More hikes in September TOLUENE DIISOCYANATE is explosive in the form of vapor-air mixture when exposed to heat, flame or sparks. Potentially violent polymerization reaction with strong bases or acyl chlorides. Reaction with aniline may generate enough heat to ignite unreacted portion and surrounding materials Benzene, 1,3,-diisocyanatomethyl- (TDI mixed isomers) CAS Registry Number 26471-62-5. Updated February 15, 2019: The Final Screening Assessment for toluene diisocyanates (TDIs) was published on July 5, 2008 under the Challenge Initiative of the Chemicals Management Plan (CMP). The assessment is summarized in this information sheet (formerly. The most common isocyanate (see Table I) is toluene diiso-cyanate, which is a mixed isomer of 2:4 and 2:6 toluene diisocyanate used in the production of rigid and flexible urethanes and urethane coatings. Other common iso-cyanates are methylene bis (4 phenyl isocyanate), which is being used in increasing quantities in the production of rigi Toluendiisocyanat (TDI) är en aromatisk isocyanat med formeln C 6 H 3 (NCO) 2 CH 3. Den förekommer i två isomera former; 2,4-TDI och 2,6-TDI. Framställning. Toluendiisocyanat framställs i en process i sex steg. 1. Nitrering Först blandas toluen (C 6 H 5 CH 3) med salpetersyra (HNO 3) för.

Tolylene-2,4-diisocyanate 95% 584-84-

TCC's Toluene Diisocyanate TDI 80-20 is a toxic and highly reactive organic compound. The chemical formula for TDI is CH3C6H3(NCO)2. TDI is often marketed as TDI 80/20. TCC's TDI 80-20 is a mixture blend of 80% 2,4-toluene diisocyanate and 20% 2,6-toluene diisocyanate. The clear to pale yellow liquid organic compound is toxic, has a sharp odor, and is highly reactive Izocianát. TDI and MDI. Isocyanates are primarily used in the manufacture of polyurethane foam for applications including the construction and automotive industries. Process Equipment for the HCL electrolysis process. TDI and MDI are produced in highly acidic and corrosive environments at high temperatures Toluene diisocyanate (TDI) is an aromatic diisocyanate.It is produced for reaction with polyols to form polyurethanes.It exists in two isomers, 2,4-TDI (CAS: 584-84-9) and 2,6-TDI (CAS: 91-08-7). 2,4-TDI is produced in the pure state, but TDI is often marketed as 80/20 and 65/35 mixtures of the 2,4 and 2,6 isomers respectively. It is a highly produced diisocyanate, accounting for 34.1% of the. TDI may play a role in the development of respiratory sensitization. If direct skin contact with isocyanates occurs, immediately remove contaminated clothing and shoes. Wipe off the isocyanate product from the skin using dry towels or other similar absorbent fabric. If readily available, apply a polyglycol-based cleanser or corn oil. If a.

Safeair Aromatic Isocyanates badge is a dual reading badge for Toluene Disocyanate (TDI) & Methyl Diphenyl Diisocyanate (MDI). This badge provides an immediate visual indication to warn the badge wearer of excessive toxic gas or isocyanate exposure levels. This makes it ideal for personal exposure limits monitoring for exposure times ranging from 15 minutes to 24 hours TDI-toluene diisocyanate (TDI 65/35) Application: This product is isocyanate ester product, can replaced all or part of the TDI 100 and Polyol / ppg pop foam raw materials for mattres Trixene Iso Type Polymer Type Viscosity @ 25C (cps) Isocyanate Eq. Wt. BI 7770 TDI Branched 68,000 1860 BI 7771 TDI Branched 80,000 1750 BI 7772 TDI Linear 35,000 2100 BI 7774 TDI Branched 40,000 1945 BI 7779* TDI Branched 30,000 2170 *contains 10% dioctyl phthalat Il diisocianato di toluene (TDI) è un diisocianato aromatico.Viene impiegato nella reazione di addizione con i polioli per formare poliuretani.Ne esistono due isomeri, 2,4-TDI (CAS: 584-84-9) e 2,6-TDI (CAS: 91-08-7). 2,4-TDI viene prodotto allo stato puro, ma il TDI viene spesso comprato come 80/20 e 65/35 in miscele degli isomeri, rispettivamente 2,4 e 2,6. È un importante prodotto.

Toluene diisocyanate: an assessment of carcinogenic risk

톨루엔 디이소시아네이트는 흡입시 입, 기관지 및 폐에 자극을 주어 가슴 압박, 기침, 호흡곤란 , 눈물, 피부 가려움 등을 일으킬 수 있다. 이러한 증상은 즉시 또는 24시간 이내에 나타날 수 있다. 농도가 낮은 증기라도 장기간 노출될 경우 천식 증상이. Erkrankungen durch Isocyanate, die zur Unterlassung aller Tätigkeiten gezwungen haben, die für die Entstehung, die Verschlimmerung oder das Wiederaufleben der Krankheit ursächlich waren oder sein können Bek. des BMGS, BArbBl. 3/2004, S. 32 Isocyanate sind reaktionsfreudige Ester der Isocyansäure mit einer oder mehreren O=C=N. Thereby, Ceresana evaluates the market size, market share and market trends of this industry. The market study is divided into following chapters: Chapter 1 is a description and analysis of the global PUR market. Development of demand, revenues, and production are explained in detail. Demand will be split by MDI and TDI based polyurethane

TDI Isocyanate is used for flexible foams (for slab stock or block foam at mattresses and automotive seats as hot or cold mold technologies). TDI iso is a reactive chemical. TDI's isocyanate groups (NCO) can be reacted with polymers that have alcohol (-OH) groups to make polyurethanes.TDI-based products are commonly used in automotive. TDI 100. Contains 2,4 isomers in 99%. Water clear liquid material. Modified TDI. Partially reacted TDI isomers giving versatility in handling and properties. Water clear liquid material. The main outlet for TDI is in the manufacture of polyurethane flexible foams used in upholstery, mattresses and vehicle seats diisocyanate (TDI) is 0.02 ppm as a ceiling value (not to be exceeded at any time). The ACGH Threshold Limit Value (TLV) for TDI is 0.005 ppm 8 hour TWA and 0.02 ppm Short Term Exposure Limit (STEL), NIOSH recommends a 0.005 ppm hour TWA and a 10 minute 0.02 ppm ceiling limit. Personnel who may be exposed to isocyanate vapor

The Toluene Diisocyanates (TDI) Action Plan (PDF) addresses EPA's review of Toluene Diisocyanate (TDI) and related compounds, CASRNs 91-08-7, 584-84-9, 26471-62-5, 9017-01-0, 26747-90-0, and 26603-40-7. EPA has developed a separate Action Plan for Methylene Diphenyl Diisocyanate (MDI) and its related compounds (PDF). TDI is chemically similar. Isocyanate Type Blocking Agent Viscosity at 25ºC (mPa·s) Equiv. Wt. (as supplied) Solids (%) Solvent Application Aromatic Blocked BI 7641 TDI prepolymer DMP 6,250 744 60 PMA/Xylene Transportation, coil, leather BI 7642 TDI prepolymer MEKO 25,000 737 60 PMA/Xylene Coil, transportation, primer/base coa TDI (Toluene diisocyanate) TDI는 80%의 2,4 단량체와 20%의 2,6 단량체의 혼합물입니다. 슬라브폼 및 자동차 시트와 같은 연질 폼 용도에 주로 이용됩니다 Toluene diisocyanate (TDI) is an aromatic isocyanate used in the production of polyurethanes for flexible foam applications. See products. Browse by application. Want more details on Coatings & Adhesives, Foam & Elastomers or Chemical Intermediates? More info. Browse by benefit Fast-curing cross-linker, requirement for very fast-drying coatings of the paint, wood, furniture and paper. But with improved compatibility. Good gloss and resistance to yellowing, as hardener of two component coating for metal and wood. Free TDI<0.5%, mix products of low-free type and fast curing type hardener

Toluene-2,4-diisocyanate (TDI) (PIM 534

Isocyanate TDI (Toluene diisocyanate) IgA. Test Code: 92330 Expand All Collapse All. Clinical and Procedure. Clinical Utility. The allergen-specific IgA assay is an in vitro quantitative assay. It is intended for use as an aid in the diagnosis of IgA mediated allergic disorders in conjunction with other clinical findings The invention relates to a preparation method of a TDI (toluene diisocynate) tripolymer gloss curing agent with low free monomer content. The components of a formula of the curing agent comprise 2,4-TDI, polyether polyol, long-chain alcohol, a catalyst A, n-butanol, a catalyst B, a polymerization inhibitor, an anti-oxidant and a solvent

Trong thị trường thương mại có những loại isocyanates phổ biến sau: TDI: toluene diisocyanate, MDI: diphenylmethane diisocyanate, MDI: naphthalene diisocyanate, HDI : aliphatic isocyanate is hexamethylene diisocyanate, IPDI: isophorone diisocyanate, HMDI : hydrogenated MDI, Hóa chất tổng hợp Polyurethane (PU) được hình thành từ phản ứng hóa học giữa. Türkçe. MDI ISOCYANATE. Many polyurethane products - such as polyurethane foams - are made by combining two types of monomer units namely isocyanates and polyols: MDI (diphenylmethane diisocyanate) or TDI (toluene diisocyanate) depending on the application, and polyether polyols. MDI isocyanate products are well suited for many industrial. ITDT : Establishing a diagnosis of an allergy to isocyanate TDI Defining the allergen responsible for eliciting signs and symptoms Identifying allergens: -Responsible for allergic disease and/or anaphylactic episode -To confirm sensitization prior to beginning immunotherapy -To investigate the specificity of allergic reactions to insect venom allergens, drugs, or chemical allergen