Cresol Red Bulk Supply for Industrial Use
China Factory Direct
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| CAS number | 1733-12-6 |
| Product name | Cresol Red |
| Stock | Stock readily available; annual supply capacity exceeding 1,000 tons. |
| Grade | Pharmaceutical GradeReagent 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 Cresol Red
Post-sale: Full documentation is provided.
To request documents, please contact us via email at sales@GRchemical.com.
Bulk Cresol Red Supplier from China
17+ years in chemical exports.Fully compliant, reliable supply.Your B2B partner in bulk chemical procurement.
Industrial Applications of Cresol Red
| Industry | Application | Process |
|---|---|---|
| Pharmaceuticals | Used as an acid-base indicator in pharmaceutical analysis and biological experiments | Exhibits a color change (yellow to red) in solution upon pH variation, for titration or pH monitoring |
| Biochemistry | Used as a pH indicator in microbial culture media | Added to culture media to monitor pH changes during fermentation |
| Education & Research | Laboratory acid-base titrations and pH range studies | Used as a teaching reagent to demonstrate indicator color-change principles |
| Chemical Analysis | Used to assess acid-base equilibrium in weakly acidic environments | Used in conjunction with standard solutions to assist endpoint determination in titrations |
Manufacturing Quality Control of Cresol Red
| Test Item | Common Testing Method | Method Overview |
|---|---|---|
| Appearance | Visual Inspection | Take an appropriate amount of sample and place it on a white background, observing its color, condition, and presence of impurities under natural light or standard light source. Catechol red should be a brownish-red to dark red crystalline powder. |
| Identification Test | Ultraviolet-Visible Spectrophotometry (UV-Vis) | Prepare a solution of a certain concentration of catechol red and measure the absorption peaks at specific wavelengths (e.g., approximately 570 nm and 430 nm), comparing with the standard spectrum to confirm identity. |
| Infrared Spectroscopy (IR) | Determine the infrared spectrum of the sample using KBr pellet method or ATR technique, comparing characteristic absorption peaks (such as phenolic hydroxyl, sulfonic acid groups, etc.) with standard IR spectra. | |
| Content Determination | High-Performance Liquid Chromatography (HPLC) | Use a reverse-phase C18 chromatographic column, with an appropriate proportion of methanol-water or acetonitrile-buffer salt solution as the mobile phase, detecting with a UV detector (e.g., λ = 570 nm), and calculating the content of the main component using the external standard method. |
| pH Value | pH Meter Measurement | Prepare a specified concentration (e.g., 0.1%) aqueous solution of catechol red and measure its pH value using a calibrated pH meter; it should comply with the range specified in the pharmacopoeia or relevant standards (usually slightly acidic). |
| Loss on Drying | Thermogravimetric Analysis / Oven Drying Method | Dry the sample at 105°C until constant weight and calculate the percentage of mass loss to evaluate the moisture and volatile matter content. |
| Residue on Ignition | High-Temperature Ashing Method | After carbonization, incinerate the sample in a high-temperature furnace at 700–800°C until constant weight, weigh the residual inorganic material to assess the inorganic impurity content. |
| Heavy Metals | Thioacetamide Method (Colorimetric Method) | According to the Chinese Pharmacopoeia or relevant standards, after treatment of the sample, add thioacetamide reagent to develop color, compare with standard lead solution, and control total heavy metal content (as Pb). |
| Chlorides | Silver Nitrate Turbidimetry | Add silver nitrate to the sample solution acidified with nitric acid to produce silver chloride turbidity, and compare with standard sodium chloride solution to control the limit of chloride ion impurities. |
| Sulfates | Barium Chloride Turbidimetry | Add barium chloride to the sample solution acidified with hydrochloric acid to produce barium sulfate precipitate, and compare with standard potassium sulfate solution to control the sulfate ion impurity limit. |
| Related Substances (Impurities) | High-Performance Liquid Chromatography (HPLC) | Use gradient elution or isocratic elution conditions to separate and detect possible synthetic by-products or degradation impurities in catechol red, and calculate the impurity content using area normalization or self-comparison methods. |
Technical Specifications of Cresol Red
| Test Item | Specification |
|---|---|
| Appearance | Red crystalline powder |
| Purity | >=98.5% |
| Melting Point | 172-176°C |
| Total Impurities | <=1.5% |
| Single Impurity | <=0.5% |
| Water Content (KF) | <=0.5% |
| Residue on Ignition | <=0.1% |
| Heavy Metals | <=20 ppm |
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 Cresol Red
| CAS/Product ID | *Required fields | |
| Lot/Batch Number | *Required fields | |
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Industrial Cresol Red 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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