Certificate of Analysis and technical specification for Pigment Red 3 (Toluidine Red) — CAS 2425-85-6. Applies to all consignments of this product and grade.
| Product Name | Pigment Red 3 (Toluidine Red) |
|---|---|
| C.A.S. Number | 2425-85-6 |
| Product Category | Pigments & Minerals |
| Product Group | Monoazo Pigment |
| Grade / Standard | ≥98% Technical |
| Physical Form | Bright red powder |
| Country of Origin | India |
| Packing | Standard export packing — bags, drums, carboys, IBC or ISO tank as applicable |
| Storage | Cool, dry, well-ventilated place in tightly closed original packing |
| S. No. | Test Parameter | Specification | Typical Result | Method |
|---|---|---|---|---|
| 1 | Description | Bright red 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 | 98.96 | Titrimetry / Instrumental |
| 5 | Shade | Matching approved standard | Matches standard | Visual / Spectrophotometric |
| 6 | Strength vs. Standard | 100 ± 3 % | 101.9 % | Spectrophotometry |
| 7 | Moisture | Not more than 5.0 % w/w | 3.07 | Gravimetry |
| 8 | Matter Insoluble in Water | Not more than 1.0 % w/w | 0.383 | Gravimetry |
| 9 | Oil Absorption | As per specification | 38 g/100 g | ISO 787-5 |
| 10 | Residue on 45 µm Sieve | Not more than 0.1 % | 0.014 | ISO 787-18 |
| 11 | pH (10 % aqueous suspension) | 6.0 – 9.0 | 7.2 | ISO 787-9 |
This document sets out the standard specification for Pigment Red 3 (Toluidine Red) and applies to all consignments of this grade. It is not a lot-specific release document; a lot-specific certificate carrying the analysis of the material actually shipped is issued with each consignment. Scapex Exports supplies against customer-specified assay limits and pharmacopoeial standards — send your specification sheet and we will confirm compliance before order.
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