3,4,5,6-Tetrabromophthalic anhydride
CAS 632-79-1
EC 211-185-4
Formula C8Br4O3
MW 463.7 g/mol
Flame Retardants Plastics & PolymersTextile, Leather & PaperElectronics Flame Retardancy
Description
3,4,5,6-Tetrabromophthalic anhydride (CAS 632-79-1) is a brominated aromatic flame retardant commercially available under trade names including Saytex RB-49, FireMaster PHT 4, FG 4000, and Bromphthal. It carries EC number 211-185-4 and is classified under HS code 29173911. No E-code designation applies to this substance.
In electronics and polymer applications, it functions as a reactive or additive flame retardant by releasing bromine radicals during combustion, interrupting the free-radical chain reactions that sustain a flame. It is incorporated into epoxy resins for printed circuit boards, polyester formulations, and textile or paper treatments where UL 94 or equivalent fire performance standards must be met.
The material is supplied as a powder grade compliant with REACH registration requirements applicable to EU-based importers and downstream users. Procurement teams should confirm supplier Safety Data Sheets align with current REACH Annex XVII restrictions and RoHS considerations relevant to electronic applications.
In electronics and polymer applications, it functions as a reactive or additive flame retardant by releasing bromine radicals during combustion, interrupting the free-radical chain reactions that sustain a flame. It is incorporated into epoxy resins for printed circuit boards, polyester formulations, and textile or paper treatments where UL 94 or equivalent fire performance standards must be met.
The material is supplied as a powder grade compliant with REACH registration requirements applicable to EU-based importers and downstream users. Procurement teams should confirm supplier Safety Data Sheets align with current REACH Annex XVII restrictions and RoHS considerations relevant to electronic applications.
Physical Properties
| Melting Point | 279.5-280.5 °C |
| Boiling Point | 540.5±50.0 °C(Predicted) |
| Density | 2.87 |
| Appearance | white to light yellow powder |
| Color | White to light yellow |
| Form | Powder |
| Water Solubility | hydrolysis |
| Vapor Pressure | 0.11 mm Hg ( 180 °C) |
| Refractive Index | 1.5000 (estimate) |
| Log P | 2.27 at 40℃ |
Safety & Handling (Learn More)
Warning GHS07
H
H317
P
P261P272P280P321P501P302+P352P333+P317P362+P364
Trade & Regulatory
| HS Code | 29173911 |
| Storage Class | 11 - Combustible Solids |
| WGK (Germany) | 2 |
Other Names
Tetrabromophthalic anhydride4,5,6,7-tetrabromo-2-benzofuran-1,3-dioneTBPAFG 4000BromphthalSaytex RB 49SAYTEX RB-49FireMaster PHT 4
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