Premium O-Tolidine CAS 119-93-7: The Authoritative Guide to Sourcing High-Purity Chemical Intermediates
O-Tolidine CAS 119-93-7
CAS:119-93-7 | C14H16N2 |MW：212.29 | EINECS NO：204-358-0
Payment: L/C,T/T,D/P,Paypal,Money Gram,Western Union
Incoterm: FOB,CFR,CIF,EXW,FCA,CPT,CIP
Transporta: Ocean, Land,Air, DHL，TNT
Port: Shanghai Port, Qingdao Port
Description
O-Tolidine CAS 119-93-7, universally recognized as 3,3′-Dimethylbenzidine or orthotolidine, is a prominent organic compound belonging to the aromatic amine family. Under standard industrial environments, this chemical intermediate manifests as a white to light brown crystalline powder or chunk structural matrix. Characterized by its precise molecular weight of 212.29 g/mol and formula C₁₄H₁₆N₂, this highly sensitive compound is prized for its signature oxidative behavior. When exposed to oxidizing agents, it triggers a vibrant color transition, establishing itself as an irreplaceable baseline indicator in modern forensic chemistry, clinical diagnostic assays, and global textile colorant production.
At Zhishang Bio Technology, we bridge the gap between premium multi-ton manufacturing capacities and stringent high-purity laboratory applications. Leveraging our established industrial footprint, we guarantee stable physical properties, including a tight melting point range of 128-131 °C and predictable solubility dynamics (sparingly soluble in water, highly clear in 2% HCl solutions). For chemical procurement managers seeking consistent batch-to-batch uniformity, our refined processing infrastructure ensures that every batch aligns perfectly with rigorous molecular specifications.
Multi-Industry Industrial Applications & Uses
The industrial utility of 3,3′-dimethylbenzidine powder spans several distinct sectors, owing to its dual functionality as a chemical structural brick and a highly responsive colorimetric substrate.
Dye and Pigment Synthesis
Historically and modernly, O-Tolidine represents a critical foundation for the global aniline dye industry. Acting as a robust diazo component, it undergoes classic chemical coupling reactions to synthesize premium azo dyes. These finished colorants are highly valued across the textile, commercial leather processing, and industrial paper printing sectors due to their outstanding surface bonding and color fastness.
Water Quality Analysis & Chlorine Estimation
Utilized extensively in environmental monitoring, this compound serves as a key component in the Orthotolidine Test for evaluating potable and treated water. It reacts with residual disinfectants like chlorine or bromine, changing color to indicate concentration levels, essential for sanitation compliance.
Clinical Diagnostics, Hematology & Forensic Science
Within medical and forensic sectors, the compound functions as a sensitive presumptive testing indicator. Due to the peroxidase-like activity found in hemoglobin, O-Tolidine solutions are regularly formulated into medical reagent strips or forensic sprays to confirm the presence of trace blood stains at complex crime scenes.
Product Images & Packaging
Product Parameters
| O-Tolidine Chemical Properties |
| Melting point | 128-131 °C(lit.) |
| Boiling point | 300.5 °C |
| density | 0.9678 (rough estimate) |
| refractive index | n20/D 1.341 |
| Fp | 244 °C |
| storage temp. | -20°C |
| solubility | 2% HCl: 10 mg/mL, clear |
| Colour Index | 37230 |
| form | powder (may contain lumps) |
| pka | 4.59±0.10(Predicted) |
| color | light brown |
| Water Solubility | Slightly soluble in water. |
| Merck | 14,9514 |
| BRN | 2210640 |
Advanced Laboratory Self-Inspection & Quality Control
We understand that an intermediate is only as reliable as its analytical verification. Rather than acting as a standard trading mediator, Zhishang Bio utilizes its own advanced testing laboratories and a dedicated, professional scientific R&D team to run exhaustive self-inspection protocols on every single production lot.
Our rigorous internal testing pipeline ensures that we deliver an industry-leading purity baseline of ≥98.0% or ≥99.0% via standard analytical methodologies:
- High-Performance Liquid Chromatography (HPLC) & GC Testing:Used to calculate precise organic purity and verify that isomeric impurities or trace background amines are tightly suppressed below acceptable thresholds.
- Nuclear Magnetic Resonance (NMR) Spectroscopy:Executed regularly to confirm structural structural integrity, ensuring no unwanted degradation or structural variations occurred during large-scale batch pooling.
- Moisture & Ash Verification (Karl Fischer Titration):Guarantees minimal water retention, protecting the product’s long-term shelf life (certified up to 5 years under optimal storage conditions).
- Batch-Specific COA Generation:A verified Certificate of Analysis (COA) specifying real measured values for color, purity, and melting points accompanies every package. Buyers can instantly Contact Us to Get COA/MSDS prior to placing industrial sample orders.
O-Tolidine 's Procurement Guide
Procurement Guidelines
1. Sample Policy
We can provide a 2-3g free trial package (shipping fee required)
2. Batch procurement
Packaging: 25kg/bag; 220kg/barrel; Special packaging according to your needs
MOQ：1kg
3. Customized services
Concentration customization (90% -99%)
Paeonol’s outsourcing services
FAQ
Yes, we have our own factory called ” ZhiShang Industry Group “
Yes, we have GMP certificate for some products, and we can provide DMF as well.
-Quality you require, eg. Assay, Purity, or single impurity
-Quantity you need
-Standard you want, such as USP, EP, JP etc.
Escrow and T/T in advance are highly recommended. We can accept Western Union, Money Gram and Paypal as well.
For sample(less than 1kg), in about 3 working days after payment; for larger orders (more than 1kg), in about 7 working days after payment.
For samples, we will send by TNT/DHL/FEDEX/UPS express, usually it takes about 3-5 day.
Related References
Manufacturer of O-Tolidine
Achievements
Advantage
Service
FAQ
Advice on Shipping
Achievements
Zhishang Bio is based in Shandong, serves the whole country, faces the world, and is determined to become an excellent supplier and service provider in the chemical industry.
As a top manufacturer of cosmetic raw materials, disinfectants, flavors and fragrances in China, we are committed to producing high-quality products and have won high praise from customers all over the world.
In the next 10 years or even longer, Zhishang Bio will always adhere to the tenet of quality first and reputation first, and devote itself to providing customers with thoughtful and perfect services.
As a professional O-Tolidine manufacturer, Zhi shang Bio has served more than 6,000 customers around the world. Because of our high-quality products and professional services, we have won high praise from most of our customers.
Advantage
Zhishang Bio is a professional enterprise engaged in the research and development, production, and sales of chemical raw materials. It has a strong supply chain system and strict quality control standards to ensure the provision of high-quality products with high purity and stability to customers.
Zhishang Bio’s core strength is its independent research and design capabilities. It has advanced production equipment, testing laboratories and can customize chemical raw materials to meet the market demands. This includes pharmaceuticals, electronic, coatings and agricultural applications.
Zhishang Bio’s supply chain management is based on long-term relationships with domestic and international suppliers of high quality to guarantee a stable supply, optimize logistic systems, and achieve efficient distribution. This helps reduce the cost of customer purchases.
We adhere to international environmental standards and we also adhere to the concept that environmental protection and safety production are important. All production processes must comply with these standards in order to guarantee that our products will be green and sustainable.
With a professional technical team and comprehensive after-sales service, Zhishang Bio can provide customers with precise technical support, solve application problems, and help customers enhance product competitiveness.
We are always customer-oriented and committed to becoming a trusted chemical raw material partner.
Service
Zhishang Biography is dedicated to using clients extensive and expert service, including chemical raw material. The customers will certainly receive hassle-free, efficient and one-stop options.
1. Custom-made Supply Solutions
Zhishang Bio provides tailored services for clients in the chemical basic material sector, including special bit dimension, solvent residue control, stability optimizations and more. Clients can personalize their services to satisfy details requirements in industries such as drugs, electronic devices, and finishings.
2. Strict quality assurance
Zhishang Bio utilizes advanced screening equipment and stringent quality examination procedures, in addition to various other files, to guarantee that every batch of products is certified with international criteria such ISO GMP, REACH, and so on. Customers are also given with full quality records and conformity documents.
The supply chain is secure
Zhishang Bio has actually established lasting calculated collaborations with worldwide makers of top notch raw materials to make certain a secure supply, maximize the storage facility and logistics system, and assistance both small-scale examinations and large orders. It adjusted to the changing requirements of clients by responding flexibly to these changes.
4. Technical support
Zhishang Bio’s technical group can offer suggestions on product applications, formula optimization and analysis of industry patterns to aid clients fix technological troubles during production and boost item efficiency.
5. Efficient after-sales service
Zhishang Bio provides complete monitoring, reacts to client requests and delivers promptly. This will certainly make certain customer complete satisfaction.
Zhishang Biography intends to help consumers expand their service by providing the very best solutions and chemical resources.
FAQ
DO YOU ACCEPT SAMPLE ORDER?
We will make samples before mass production. After the samples are approved by the department and users, we will start mass production. During the production process, we will carry out 100% inspection, and then carry out random inspection before packaging.
WHAT’S YOUR MOQ?
Our MOQ is 1kg. But usually we can also accept a smaller quantity, such as 100g, if you need it, provided that the sample fee is 100% paid.
IS THERE A DISCOUNT?
Different quantity has different discount.
HOW TO CONFIRM WHETHER THE PRODUCT QUALITY MEETS OUR NEEDS BEFORE PLACING AN ORDER?
You can consult us to get free samples of some products, you only need to pay the freight or arrange express delivery to us and get the samples. You can send us the product specifications and requirements you need, and we will manufacture products according to your requirements.
DO YOU SUPPLY PRODUCT REPORT?
Yes. We’ll give you product analysis report before shipping.
LEARN MORE ABOUT US
Shandong Look Chemical
Advice on Shipping
1. For products ≤50kg, we recommend using express delivery, which is usually called DDU service (discounted, convenient).
2. For products ≤500kg, we generally recommend air freight, which is usually called FOB, CFR or CIF service (fast and efficient).
3. For products >500kg, we generally recommend shipping by sea, which is usually called FOB, CFR or CIF service (economical, safe).
4. For high-value products, please choose air or express to ensure the safety of product transportation.
Company Info
Zhishang Bio company in China that exports chemicals, Cosmetic raw materials, and Intermediates for over 70 countries now.
And a range of 50,000 products with the best quality and competitive price to meet your different purchasing needs.
The company integrates research and development, production, and trade, with a modern production base, advanced testing equipment, and an experienced technical team to ensure that products reach industry-leading levels in purity, stability, and environmental friendliness.
