Scapex Exports Pvt. Ltd.
830, 8th Floor, Sun Gravitas, Times of India Road,
Shyamal, Ahmedabad 380015, Gujarat, India
+91 9925522674 · info@scapexexports.com
CIN U46909GJ2025PTC164345
Shyamal, Ahmedabad 380015, Gujarat, India
+91 9925522674 · info@scapexexports.com
CIN U46909GJ2025PTC164345
Certificate of AnalysisStandard product specification
4,4'-Diaminostilbene-2,2'-Disulfonic Acid (DASDA)
CAS 81-11-8 · ≥98% Technical
1. Product identity
| Product name | 4,4'-Diaminostilbene-2,2'-Disulfonic Acid (DASDA) |
|---|---|
| C.A.S. number | 81-11-8 |
| Grade / standard | ≥98% Technical |
| Description | Grey to light yellow powder |
| Product group | Stilbene Intermediates |
| Category | Dyes & Dye Intermediates |
| Country of origin | India |
| Packing | Bags, drums, carboys, IBC or ISO tank as applicable — customer-specified packing available |
| Storage | Cool, dry, well-ventilated place in tightly closed original packing |
2. Analytical specification
| S. No. | Test parameter | Specification | Typical result | Method |
|---|---|---|---|---|
| 1 | Description | Grey to light yellow powder | Complies | Visual |
| 2 | Identification | Conforms to the structure of the substance | Complies | FTIR / Chemical test |
| 3 | Solubility | As per specification | Complies | Visual / Monograph |
| 4 | Assay | Not less than 98.0 % w/w | 98.73 | Spectrophotometry |
| 5 | Shade | Matching approved standard | Matches standard | Visual / Spectrophotometric |
| 6 | Strength vs. Standard | 100 ± 3 % | 99.8 % | Spectrophotometry |
| 7 | Moisture | Not more than 5.0 % w/w | 3.17 | Gravimetry |
| 8 | Matter Insoluble in Water | Not more than 1.0 % w/w | 0.178 | Gravimetry |
| 9 | Solubility in Water at 60 °C | Not less than 80 g/L | 94 g/L | In-house method |
| 10 | Light Fastness (ISO 105-B02) | Grade 5 – 6 minimum | Grade 5 | ISO 105-B02 |
| 11 | Wash Fastness (ISO 105-C06) | Grade 4 – 5 minimum | Grade 5 | ISO 105-C06 |
3. Declaration
This document sets out the standard specification for 4,4'-Diaminostilbene-2,2'-Disulfonic Acid (DASDA) and applies to all consignments of this product and grade supplied by Scapex Exports Pvt. Ltd. It is not a lot-specific release document; a lot-specific certificate carrying the analysis of the material actually shipped is issued with, and travels with, each consignment. Scapex Exports supplies against customer-specified assay limits and pharmacopoeial standards — send your specification sheet and we confirm compliance in writing before the order is accepted.
SCAPEXQUALITY ASSURED