Bulk AZO-Dye Methyl Red powder

Q1: What is Methyl Red (CAS 493-52-7)?

Methyl Red (C₁₅H₁₅N₃O₂, molecular weight 269.30) is an azo dye commonly used as a pH indicator, turning red below pH 4.4 and yellow above pH 6.2, with orange in between. It appears as a dark red to red-violet crystalline powder.

Q2: What are the visual transition range and absorption maximum?

The transition range is from p 4.4 (red) to p 6.2 (yellow), with an orange intermediate. The absorption maximum is λmax = 523–526 nm at pH 4.5 and λmax = 427–437 nm at pH 6.2.

Q3: Can I order smaller samples for testing before a bulk purchase?

Yes, we offer sample sizes for initial validation — from laboratory quantities (e.g., 100 g, 500 g) to pilot batches, with flexible packaging options available upon request.

Q4: What packaging options are available for bulk Methyl Red powder?

We provide packaging ranging from 1 kg containers to bulk bags (e.g., 25 kg drums, 100 kg drums, or 1,000 kg totes) depending on your requirements. Custom packaging is also available.

Q5: Are there any specific quality standards or certifications your Methyl Red meets?

Our Methyl Red is manufactured in compliance with ISO 9001 standards. Certificates of Analysis (COA) are available for every batch.

Q6: What is the typical shelf life of Methyl Red powder, and how should it be stored?

When stored properly in a cool, dry place, away from light and moisture, Methyl Red typically remains stable for 24–36 months. Avoid prolonged exposure to heat, humidity, and light to prevent degradation.

Q7: How is Methyl Red used in the pigment and dye industry?

Methyl Red is an azo dye used to dye textiles, including pH‑sensitive fabrics. Research has demonstrated its use in conventional dyeing processes and in advanced sol‑gel coating systems for the durable dyeing of synthetic fibers. It can also be used as an auxiliary indicator to adjust the dye bath pH and ensure uniform coloration.

Q8: Is Methyl Red suitable for pharmaceutical research and manufacturing?

For pharmaceutical researchers, Methyl Red is used as a fully characterized chemical reference standard for analytical method development, method validation, and quality control applications. 

Q9: What is the role of Methyl Red in the agricultural fertilizer/biostimulant sectors?

In agriculture, Methyl Red is commonly used as a pH indicator in fertilizers, soil tests, and water treatment processes to visually determine acidity and alkalinity ranges. It is also used in MPN techniques to enumerate nitrifying bacteria, in which pH changes can be detected using Methyl Red as an indicator. The compound is also used in total‑nitrogen determination (Kjeldahl) with mixed Bromocresol green‑Methyl Red indicator solutions to detect the endpoint.

Q10: Are there any other industrial applications for Methyl Red?

Beyond the sectors mentioned above, Methyl Red is also used in:

• Chemistry laboratories — as a standard acid‑base indicator in titrations and pH monitoring.

• Microbiology — as a key component of the Methyl Red (MR) test, used to identify mixed-acid-fermenting bacteria.

• Water quality analysis — for rapid pH assessment to help determine water alkalinity.

• Environmental science — as a model pollutant to study dye degradation and wastewater treatment.

• Chemical synthesis — as an intermediate for manufacturing other azo dyes and organic compounds.

Q11: What is the HS Code for Methyl Red, and are there any special customs considerations?

The Harmonized Tariff Code for Methyl Red is 29270000 (diazo-, azo-, or azoxy-compounds). Import duties and taxes may apply depending on the destination country, and importers should verify local requirements before placing an order.

Q12: What is your typical lead time for bulk orders?

Lead times vary depending on order volume and destination, but typically range from 2–4 weeks for bulk orders after payment confirmation.

Q13: Do you ship worldwide? Are there any restricted countries?

We ship globally to most countries. However, certain destinations may have import restrictions on chemicals. Please get in touch with us to confirm shipping availability to your specific location.

Q14: Is Methyl Red carcinogenic?

The International Agency for Research on Cancer (IARC) classifies Methyl Red in Group 3 — unclassified as to carcinogenicity in humans, meaning there is inadequate evidence to determine its carcinogenic potential.

Q15: Are there any regulatory restrictions on the use of Methyl Red in food or agricultural products?

Regulatory bodies such as the US FDA do not list Methyl Red as an approved food additive (Title 21, Part 73.170). For agricultural applications, certain jurisdictions discourage the use of synthetic pH indicators on crops and animals, preferring natural alternatives. Please check your local regulations before using Methyl Red in such applications.

Q16: Can Methyl Red be used in consumer products?

Methyl Red is intended for professional manufacturing, research laboratories, and industrial/commercial usage only and is not approved for medical or consumer use.

Q17: What is the price for bulk Methyl Red powder?

Pricing depends on volume and destination. Contact us for a customized quotation based on your specific needs.

Q18: Do you offer volume discounts for large orders?

Yes, we offer competitive tiered pricing based on order quantity. Larger orders receive significant discounts — please get in touch with our sales team for a detailed price quote.

Q19: Can I request a bulk quotation for multiple products?

Absolutely. If you require Methyl Red alongside other chemical products, we are happy to provide a combined quotation and consolidated shipment.