|
HS Code |
933264 |
| Cas Number | 576-26-1 |
| Molecular Formula | C22H18O4 |
| Molar Mass | 346.38 g/mol |
| Appearance | White to yellowish powder |
| Melting Point | 225-229 °C |
| Solubility In Water | Insoluble |
| Solubility In Alcohol | Slightly soluble |
| Ph Indicator Range | 8.2 - 9.8 |
| Color Change | Colorless to red violet |
| Lambda Max Ethanol | 560 nm |
| Boiling Point | Decomposes |
| Storage Conditions | Store at room temperature, tightly closed |
As an accredited O-Cresolphthalein factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | O-Cresolphthalein is packaged in a 25 gram amber glass bottle, featuring a secure screw cap and clearly labeled hazard information. |
| Shipping | O-Cresolphthalein is shipped in tightly sealed, chemical-resistant containers to prevent leakage and contamination. It should be packaged according to hazardous materials regulations, clearly labeled, and protected from moisture and light. Appropriate documentation and safety data must accompany the shipment, ensuring compliance with international and local transport guidelines for laboratory chemicals. |
| Storage | O-Cresolphthalein should be stored in a tightly sealed container, in a cool, dry, and well-ventilated area away from incompatible substances such as strong oxidizers and acids. Protect it from direct sunlight and moisture. Label the storage container clearly and keep it away from heat sources. Always follow proper chemical storage protocols and local safety regulations. |
Competitive O-Cresolphthalein prices that fit your budget—flexible terms and customized quotes for every order.
For samples, pricing, or more information, please call us at +8615380400285 or mail to sales2@liwei-chem.com.
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Tel: +8615380400285
Email: sales2@liwei-chem.com
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As a chemical manufacturer steeped in years of batch synthesis and lab experience, I want to speak plainly about one of our regular products, O-Cresolphthalein. This is a chemical that we see used extensively across laboratories and quality control benches. Our process begins from the fundamentals: O-Cresolphthalein, also known as 3,3-Bis(p-hydroxyphenyl)-o-cresol, stands out as a reliable pH indicator. Chemists rely on its precise color change, transitioning from colorless to purple over the right pH range, mainly for calcium determination in water and biological specimens. That's where its real value shows.
We manufacture O-Cresolphthalein following a careful condensation process with raw materials that pass through multi-stage quality checkpoints. On our line, each lot faces scrutiny for purity by HPLC and melting point analysis. Our standard grade holds a purity of >98%, yielding sharp and consistent colorimetric results in titration protocols. The crystalline powder appears off-white, though minor color variation signals nothing except unreacted starting material—easily detected and dealt with. Scientists expect genuine, interference-free results, and our continuous process optimization has evolved to cut down on trace impurities that competitors sometimes leave behind. Spectroscopic verification remains routine to ensure batch consistency.
We hear plenty of questions about particle size and solubility. The compound requires dissolution in ethanol before dilution to aqueous media. Some competitor batches gum up at this step, but after adjusting our crystallization stage, we've been able to achieve free-flowing powder without excessive fines or sticky lumps. That has saved lab techs the frustrating step of multiple filtrations.
Most scientists use our product for photometric determination of calcium in water, serum, or process fluids. Our own testing follows the well-known O-Cresolphthalein Complexone method, prized for selectivity and accuracy. After years supporting environmental and clinical customers, we streamlined high-volume production to support repetitive assays, including automated analyzer lines where soluble, stable indicators prove crucial. The indicator responds within the narrow pH range—usually between 8.3–10.5—because that matches the zone where calcium forms the colored complex. Once in the customer’s hands, our product dissolves quickly, reaching working concentration fast.
O-Cresolphthalein also sees niche uses in teaching and training labs. New users appreciate the distinct purple to colorless transition. It saves time compared to traditional, slower titrimetric indicators. As questions come in from new technicians, we walk them through making up stock solutions, storing under cool dry air, and watching for degradation by moisture or light. Our batches show shelf stability over many months—vital for labs buying in volume.
In the real world, O-Cresolphthalein’s closest alternatives for calcium detection are methylthymol blue and Eriochrome Black T. From our manufacturing perspective, these have drawbacks you don’t always see until you scale up use. Methylthymol blue gives shifts in color, but it reacts with magnesium as well as calcium, sometimes leading to overestimated readings in hard water. With O-Cresolphthalein, you get cleaner selectivity. We’ve encountered fewer false positives when running parallel tests—an advantage especially when testing compliance around potable water standards.
Eriochrome Black T, more popular in hand titrations, isn’t suitable for photometric readings. It’s also less stable in solution, browning after storage. As a manufacturer, we know that customers want a product that survives repeated opening, resealing, and even the less-than-ideal climate of field labs—O-Cresolphthalein handles that well after careful formulation and quality control. Laboratories running high sample volumes value both the stability and the clear endpoint.
Manufacturing always reveals quirks in a molecule. Early attempts at bulk runs of O-Cresolphthalein used single-stage synthesis. Impurities hung on, especially from incomplete condensation. These accounted for dull coloration and inconsistent transitions in solution. Our process now draws on double-recrystallization and longer vacuum drying, which means a reproducible melt point and optical clarity in solution. By investing in better filtration and cleaning protocols, impurities like p-resorcinol move below detection limits by the final QC step.
Scaling up O-Cresolphthalein comes with safety and reactivity tradeoffs. High-temperature steps, strongly basic conditions—these challenge both equipment and technicians. We swapped out older glassware for Teflon-lined reactors, which stand up better to reaction media and reduce contamination risks. The whole plant benefits from lessons learned batch after batch, avoiding corrosion and cross-contamination that can dog smaller operators or resellers.
Every time a new lot rolls off the line, we send samples to outside labs for third-party validation. We’ve learned that transparency in test results strengthens trust with long-term customers, and improves our own troubleshooting. These outside checks also reveal occasional surprises, spurring small adjustments in drying times or solvent exchanges. The result is a product that reflects real-world needs—quick response, consistent results, and no unpleasant surprises when it arrives at a customer’s lab.
Reliability under field conditions stands out as a constant demand. Power outages, heat waves, delays in shipping—these stress any chemical. O-Cresolphthalein isn’t immune, but over time, we’ve introduced packaging improvements: Mylar pouches with moisture scavengers, airtight tins that stack easily, heavy-duty jars for bulk supply. Shelf life routinely exceeds a year under proper storage, and we publish retest dates based on experience, not theory.
Feedback from customers has taught us the value of technical support. Labs sometimes report haze or unexpected fading in their indicator solutions. Usually, it traces back to water quality or excessive light exposure, but in some cases, a raw material lot missed our detection systems. We issue replacement batches, retrace our syntheses, and publish the findings to improve. That honest loop of feedback and correction improves future runs—not just for us, but for everyone using calcium assays around the world.
As large-scale synthesis continues to grow, environmental stewardship cannot lag. Production of O-Cresolphthalein uses phenolic precursors and strong bases, carrying risks for both worker safety and downstream disposal. On the factory floor, we’ve switched to closed-loop scrubbers for vent gases, solvent recovery tanks for reducing waste, and in-process monitoring to detect leaks before they endanger either staff or neighbors.
Waste minimization now figures into every lot. Phenolic waste, once a persistent problem, now gets processed via catalytic oxidation units, which cut both toxic load and regulatory headaches. Our solvent residues route to certified recovery plants, not the drain. We keep detailed batch records so traceability remains intact, and train every worker to report any anomaly—no matter how small. Environmental regulations grow tighter every year; by tackling real risks early, we not only meet them but often exceed compliance.
Trust from customers springs from more than a clean product. Every tin or pouch we ship out ties back to documented synthesis runs: raw material sources, operator log sheets, temperature curves, drying logs, test records. Our team undergoes periodic training and audits, ensuring every step matches our best practices. Customers with specific compliance programs, from ISO to local health authorities, know we can provide full batch histories and test certifications. Our staff know the hot spots where issues can arise, and the culture encourages accountability at each step.
Our industry sees plenty of O-Cresolphthalein available from distributors and trading companies. The difference in quality often hinges on direct control—or lack thereof. Resellers sometimes buy in bulk from unverified sources, repackage, and offer little more than a reprinted certificate. That can lead to headaches after the fact: suspect color changes, contaminants, poor solubility, opaque sourcing. As direct manufacturers, we stand behind every lot, and can answer detailed questions about origin, shelf life, or subtle analytical variances. If a customer achieves better consistency and lower incidence of analytical drift using our batches, that reflects our process improvements, not just luck in sourcing.
Some third-party suppliers offer alternative indicators at lower cost. These may carry extra stabilizers or modified particle size, which suits some instrument setups, but often at the cost of more complex dissolution or incomplete color changes. Regular comparison runs with such products show that direct synthesis control gives us the edge in batch-to-batch consistency. Our policy keeps formulas transparent and documentation available—never hiding behind proprietary blends or unknown additives.
Routine environmental water testing relies heavily on O-Cresolphthalein. Water treatment plants and municipal supply labs check calcium routinely to track scaling risk and ensure health standards. Synthetic lots meeting high-purity thresholds support accurate readings, preventing underestimation that could skew corrective dosing. On the biochemistry side, hospitals monitor serum calcium in the context of kidney and endocrine health. We test our batches against standard curves using both manual and automated systems, confirming that our compound performs identically in classic tube tests and advanced robotic analyzers.
Industrial laundries, cooling towers, beverage bottlers—all seek robust and reproducible calcium checks, particularly to avoid scale in pipes and boilers. We listen for reports from these sectors, noting any difficulties with sample matrix, instrument carryover, or background reactivity. Regular dialogue with QA teams from these customers shapes our internal review process, so every formulation remains grounded in practical needs.
Process engineers and quality managers on our team keep revisiting the synthesis route, not content with yesterday’s standards. Energy efficiency, yield optimization, risk reduction—these belong in daily conversations on the plant floor. Emerging green chemistry techniques, including alternative solvents and reduced waste flows, continue to drive minor but meaningful improvements in each O-Cresolphthalein batch. Formulations have slimmed down, stabilizers refined, and packaging materials streamlined—as a result, customers benefit from a product that reflects continual care at each production stage.
We remain attentive to shelf-life studies and post-market feedback, pulling any batch that hints at sub-par performance. Rather than hiding errors, we proactively communicate issues and solutions back to every affected user. That builds loyalty and a genuine partnership with technical end users.
Labs trust us not simply for the product, but for our scientific approach. Every analytical report we issue offers detailed backing—HPLC traces, lot-specific certificate data, storage and stability guidance. Our technologists routinely review raw material supply chains, confirming identity and purity with advanced analytical instruments, from NMR to UV-Vis spectrophotometry.
We understand that anyone relying on O-Cresolphthalein for regulatory-compliant or life-critical measurements demands clarity and openness. If a customer faces an unexpected result, they receive direct access to our technical chemists—not a sales hotline or generic FAQ. Open dialogue shortens troubleshooting times, preventing recurring issues across multiple labs.
Advances in instrumentation—faster analyzers, miniaturized spectrophotometers, fully automated titration platforms—keep changing the demands on chemical indicators like O-Cresolphthalein. We stay tuned to these trends through customer workshops, industry journals, and regular site visits. If technical tweaks are needed to meet next-generation protocols, our R&D group stands ready to adapt.
We also expect more labs to migrate toward greener, safer processes. Work continues on reducing the environmental impact of both the synthesis itself and the packaging that reaches end users. Down-gauging bottle weight, switching to recycled plastic, introducing QR-coded batch histories—all help push the industry forward, step by step. No company can stand still if it wants to serve tomorrow’s analytical demands as well as today’s.
Chemical manufacturing sits at the intersection of science, industry, and practical necessity. O-Cresolphthalein exemplifies what careful, science-driven production looks like—optimized synthesis, rigorous analytical checks, and feedback-guided improvements. By listening to the real problems that customers encounter, and tackling them in production, we deliver a result that simplifies lab work and supports data you can trust—batch after batch, order after order.
