3,3'-Dimethyl-4,4'-biphenylene diisocyanate Bulk Supply for Industrial Use
China Factory Direct
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| CAS number | 91-97-4 |
| Product name | 3,3'-Dimethyl-4,4'-biphenylene diisocyanate |
| Stock | Stock readily available; annual supply capacity exceeding 1,000 tons. |
| Grade | Material GradeSpecialty GradeIndustrial Grade |
| Packaging | 25KG/bag500KG/bag1000KG/bag |
| Sample | Test Samples Available (Click to Request Samples) |
| COA | View COA |
| Price | Get Quote |
| Supply Type | Bulk / Contract manufacturing / OEM |
| Shipping | FCL / LCL available |
| Payment Terms | Support FOB \ CIF \ EXW quotations, and accept Letter of Credit (L/C). |
| Manufacturer | Greenrock Chemical(China Factory) |
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Documents We Provide for 3,3'-Dimethyl-4,4'-biphenylene diisocyanate
Post-sale: Full documentation is provided.
To request documents, please contact us via email at sales@GRchemical.com.
Bulk 3,3'-Dimethyl-4,4'-biphenylene diisocyanate Supplier from China
17+ years in chemical exports.Fully compliant, reliable supply.Your B2B partner in bulk chemical procurement.
Industrial Applications of 3,3'-Dimethyl-4,4'-biphenylene diisocyanate
| Industry | Application | Process |
|---|---|---|
| Polyurethane Foam | Production of flexible and rigid polyurethane foams | Reacted with polyols to produce polyurethane polymers |
| Coatings Industry | Manufacturing high-performance coatings | Mixed with resins and other components, applied via spraying or brushing |
| Adhesives Industry | Production of high-strength adhesives | Mixed with other components for bonding metals, plastics, and various substrates |
| Elastomer Production | Manufacturing polyurethane elastomers | Reacted with chain extenders and other components to form elastomeric structures |
Manufacturing Quality Control of 3,3'-Dimethyl-4,4'-biphenylene diisocyanate
| Detection Item | Common Analytical Method | Method Overview |
|---|---|---|
| Assay (Purity) | HPLC with UV detection | Quantification based on peak area comparison against a certified reference standard using reversed-phase chromatography. |
| Isomer Ratio (2,4'- vs 4,4'-MDI) | HPLC with UV detection | Separation and relative quantification of structural isomers using optimized C18 column and gradient elution. |
| Free Isocyanate Content | Titration with dibutylamine | Reaction of -NCO groups with excess dibutylamine followed by back-titration with HCl to determine unreacted amine. |
| Acid Number | Potentiometric titration with KOH | Neutralization of acidic impurities (e.g., carbamic acids, hydrolyzed products) using standardized alcoholic KOH solution. |
| Water Content | Karl Fischer coulometric titration | Electrochemical generation of iodine to react stoichiometrically with water in the sample; quantified via charge measurement. |
| Color (APHA) | Visual or spectrophotometric comparison | Measurement of yellowness intensity by comparing sample absorbance at 430 nm to APHA platinum-cobalt standards. |
| Residue on Evaporation | Gravimetric analysis | Evaporation of a weighed sample under controlled temperature and pressure, followed by weighing of non-volatile residue. |
| Chlorinated Impurities (e.g., Phosgene residues) | GC-MS | Separation by gas chromatography and identification/quantification of chlorinated compounds using mass spectral detection. |
| Heavy Metals (Pb, Cd, Hg, Cr) | ICP-MS | Atomization and ionization in plasma, followed by mass-selective detection and quantification of elemental isotopes. |
| Total Chlorine Content | Combustion ion chromatography (CIC) | High-temperature combustion to convert organochlorine to chloride ions, followed by IC detection. |
| Viscosity (at 25 C) | Rotational viscometry | Measurement of resistance to shear flow using a calibrated spindle rotating at defined speed and temperature. |
| Crystallization Temperature | Differential scanning calorimetry (DSC) | Detection of solidification onset temperature by monitoring heat flow during controlled cooling. |
Technical Specifications of 3,3'-Dimethyl-4,4'-biphenylene diisocyanate
| Test Item | Specification |
|---|---|
| Appearance | White to almost white pellets |
| Purity | >=98.0% (GC-MS) |
| Water Content (KF) | <=0.5% |
| Total Impurities | <=2.0% |
| Single Impurity | <=0.5% |
| Melting Point | 70–74°C |
| Identification (NMR) | Consistent with structure |
| Identification (IR) | Consistent with structure |
Specifications vary by industry. Reach out to our technical experts for a COA tailored specifically to your application. Email:selse@GRchemical.com
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Download COA of 3,3'-Dimethyl-4,4'-biphenylene diisocyanate
| CAS/Product ID | *Required fields | |
| Lot/Batch Number | *Required fields | |
NMR Spectra of 3,3'-Dimethyl-4,4'-biphenylene diisocyanate
Safety Information of 3,3'-Dimethyl-4,4'-biphenylene diisocyanate
| Pictograms |    |
| Signal Word | Danger |
| Safety Data Sheet | |
Packaging of 3,3'-Dimethyl-4,4'-biphenylene diisocyanate
Industrial 3,3'-Dimethyl-4,4'-biphenylene diisocyanate Procurement FAQ
1. How do you ensure product quality consistency?
We rely on a mature China-based manufacturing system and implement strict batch control and quality inspection for every shipment. Our production process complies with ISO 9001 standards, and a COA is provided for each batch to ensure consistent and reliable quality.
2. Do you offer competitive pricing for bulk orders?
Yes, as a China-based manufacturer and bulk supplier, we provide tiered pricing based on order volume. We support FOB and CIF quotations, as well as L/C payment terms for large transactions to meet international trade requirements.
3. Can you support large-volume or long-term supply?
We have stable production capacity and a well-established supply chain, enabling continuous bulk supply. We support ton-level and container-level orders, as well as long-term cooperation projects.
4. What is your typical lead time?
For in-stock products, shipment can be arranged within 1–3 days. For bulk packaging or customized orders, lead time depends on the specific quantity and production schedule.
5. What documents do you provide?
We can provide complete documentation upon request, including COA, SDS, TDS, and other compliance certificates, meeting industrial procurement and export requirements.
6. Can you customize product specifications or packaging?
Yes, we support customization of parameters such as purity, impurities, residual solvents, and heavy metals. We also offer various bulk packaging options, including 25kg bags, drums, and IBC tanks, suitable for industrial applications and transportation.
7. What shipping options do you support?
We support both FCL (Full Container Load) and LCL (Less than Container Load) shipments, and can flexibly arrange logistics solutions based on order size to meet bulk chemical export needs.
8. Do you provide technical or application support?
Yes, we provide basic application guidance and technical support based on industry experience to help customers optimize product usage.
9. How do you handle compliance and export regulations?
We are familiar with international trade and export regulations, ensuring all products comply with relevant requirements. We also provide complete documentation to support smooth customs clearance and global delivery.
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