| Customization: | Available |
|---|---|
| CAS No.: | 32638-88-3 |
| Formula: | C19h12o8s |
|
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Hunan Yunbang Pharmaceutical Co., Ltd. (Yunbangpharm) located in Changsha High-tech Industrial Park, Hunan. It is a high-tech enterprise specializing in the research and development, production and sales of Pharmaceutical raw materials, Pharmaceutical intermediates(API) and Fine chemicals. Based in China, Yunbangpharm has been providing suitable solutions for many domestic,foreign pharmaceutical companies and traders. Excellent quality, good reputation and authentic price have won the praise of the majority of customers.
1:Can I get some samples before bulk order?
A: Most products provide free samples, but the shipping cost be paid by customers.
2: What's your MOQ?
A: We can have a discussion.
3: Which kind of payment terms do you accept?
A: PI will be sent first after confirmation of order,enclosed our bank information.Payment by T/T, Western Union,D/P, ETC.
4.How to place an order?
A: You can contact me through Trademanager, WhatsApp, Email and other contact methods, tell me the product and quantity you need, and then we will give you a quote.
5:How about your delivery time?
A: Generally, it will take 3 to 5 days after receiving your advance payment.
6:How do you treat quality complaint?
A: First of all, our quality control will reduce the quality problem to near zero. If there is a real quality problem caused by us, we will send you free goods for replacement or refund your loss.
1. 90days quality guarantee for exchange.
2. For each batch order extracts, we will attach a factory Inspection Report with the goods delivery , including the BatchNo/ Date/ Test index ects; also will keep the archived extracts to ensure received by customers are the same each time.
3. Our team of experienced professionals are available online 24 hours a day to answer any questions and provide guidance on product usage and maintenance.
| Product Name: | PYROGALLOL RED |
| Synonyms: | PYROGALLOL RED INDICATOR FOR &;PyrogallolRedGr;Pyrogallol Red, indicator grade, pure;Pyrogallol Red, pure, 98%;Spiro(3H-2,1-benzoxathiole-3,9'(9H)xanthene)-3',4',5',6'-tetrol,1,1-dioxide;spiro[3h-2,1-benzoxathiole-3,9'-[9h]xanthene]-3',4',5',6'-tetrol,1,1-dioxide;PR;PYROGALLOL RED, INDICATOR FOR COMPLEXO-M ETRY |
| CAS: | 32638-88-3 |
| MF: | C19H12O8S |
| MW: | 400.36 |
| EINECS: | 251-134-3 |
| Product Categories: | Analytical Chemistry;Bipyridyls, etc. (Chelating Reagents);Chelating Reagents |
| Mol File: | 32638-88-3.mol |
| Melting point | 133-134 °C(lit.) |
| Boiling point | 309 °C(lit.) |
| density | 1.082 g/mL at 20 °C |
| vapor density | 4.4 (vs air) |
| vapor pressure | 10 mm Hg ( 167.7 °C) |
| refractive index | n20/D 1.387 |
| storage temp. | Inert atmosphere,Room Temperature |
| pka | 7.86±0.20(Predicted) |
| form | Liquid |
| color | Dark brown |
| Water Solubility | Soluble in water, ammonium hydroxide (10 mg/ml), and ethanol. |
| BRN | 363738 |
| CAS DataBase Reference | 32638-88-3 |
| EPA Substance Registry System | Spiro[3H-2,1-benzoxathiole-3,9'-[9H]xanthene]-3',4',5',6'-tetrol, 1,1-dioxide (32638-88-3) |
| Hazard Codes | Xn,Xi |
| Risk Statements | 20/21/22-52/53-68-36/37/38 |
| Safety Statements | 36/37-61-24/25-22-36-26 |
| RIDADR | UN 2811 6.1/PG 3 |
| WGK Germany | 3 |
| RTECS | UX2800000 |
| F | 8 |
| TSCA | Yes |
| HS Code | 2934 99 90 |
| Chemical Properties | Also know nas pyrogallol and 1,2,3-trihydroxy-benzene,C6H3(OH)3 is white,lustrous crystals that turn gray on exposure to light. It is soluble in water,alcohol,and ether. A solution of pyrogallol acquires a brown color on exposure to air. This absorption of oxygen and change of color take place rapidly when the solution is made alkaline. Derivation is by heating gallic acid in an autoclave with three times its weight of water. Uses are as a protective colloid in preparation of metallic colloidal solutions, photography, dyes, intermediates, synthetic drugs, medicine (antibacterial), process engraving, laboratory reagent, gas analysis (an oxygen absorber), reducing agent, and antioxidant in lubricating oils. |
| Chemical Properties | dark brown powder |
| Uses | The white powdery crystal was made by the superheating of gallic acid. Pyrogallic acid, popularly known as pyro, is one of the earliest developers and its use has spanned three centuries. It was first used in an acid state to physically develop wet collodion negatives. When silver bromide gelatin plates were adopted pyro was used again but in an alkaline state for chemical development. It was used throughout the 20th century and often chosen for the peculiar yellow stain it imparted to gelatin negatives. |
| Uses | Pyrogallol Red is a complexometric indicator for the metal elements molybdenum and copper. Dyes and metabolites. |
| Purification Methods | It is recrystallised from aqueous alkaline solution (Na2CO3 or NaOH) by precipitation on acidification, filter it off and dry in a vacuum. [Suk Collect Czech Chem Commun 31 3127 1966, Beilstein 19 H 407, 19 II 417, 19 III/IV 599, 19/10 V 226.] |
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