CAS 106-94-5 · Halogenated Solvent · DOT Class 3
n-Propyl Bromide
nPB / 1-Bromopropane · C₃H₇Br · MW 122.99 g/mol
n-Propyl bromide (nPB, 1-bromopropane) is a fast-evaporating halogenated solvent with outstanding solvency for oils, greases, fluxes, and adhesive residues. It has been widely adopted as a high-performance cleaning solvent in precision degreasing, electronics assembly, and aerosol formulations. Texas-Chem supplies nPB in industrial, technical, ACS reagent, and electronic grades in drums, totes, and bulk, with full regulatory and SDS support.
Formula
C₃H₇Br
Boiling Point
71.0 °C (159.8 °F)
Flash Point
−1 °C — Flammable
Pack Sizes
Drums · Totes · Bulk
Structural Formula
Linear three-carbon chain with a terminal bromine substituent at C-1
Safety & Regulatory
- NFPA Health
- 2 — Moderate hazard
- NFPA Flammability
- 3 — Serious flammability hazard
- NFPA Reactivity
- 0 — Stable
- OSHA PEL (TWA)
- 10 ppm (proposed)
- ACGIH TLV (TWA)
- 0.1 ppm — Skin notation
- NIOSH REL
- Minimize exposure — potential carcinogen (Ca)
- Flash Point
- −1 °C (30 °F) — Flammable
- DOT Hazard Class
- 3 — Flammable Liquid
- UN Number
- UN 2344
- Packing Group
- II
SDS available upon request. nPB is classified as a potential human carcinogen (NIOSH Ca) and reproductive hazard. ACGIH TLV is 0.1 ppm with a skin notation — use only with adequate local exhaust ventilation and appropriate respiratory protection. Flammable liquid — keep away from ignition sources. Comply with applicable EPA NESHAP and OSHA regulations.
Grades & Packaging
Available Grades
Pack Sizes
Physical & Chemical Properties
| Molecular Formula | C₃H₇Br |
| Molecular Weight | 122.99 g/mol |
| CAS Number | 106-94-5 |
| Appearance | Clear, colorless liquid |
| Boiling Point | 71.0 °C (159.8 °F) |
| Melting Point | −110.3 °C (−166.5 °F) |
| Flash Point | −1 °C (30 °F) — Flammable liquid |
| Density | 1.354 g/cm³ at 20 °C |
| Vapor Pressure | 111 mmHg at 20 °C |
| Solubility in Water | 2.5 g/100 mL at 25 °C (slightly soluble) |
| Refractive Index | 1.4341 at 20 °C |
| Odor | Characteristic sweet, ether-like halogenated odor |
Industrial Applications
Precision Cleaning & Degreasing
n-Propyl bromide (nPB) is widely used as a precision cleaning solvent for metal parts, electronic assemblies, circuit boards, and optical components. Its high solvency for oils, greases, fluxes, and particulate contamination — combined with fast evaporation and non-residue characteristics — makes it a preferred alternative to trichloroethylene and methylene chloride in vapor degreasing and cold cleaning operations.
Aerosol & Specialty Formulations
Used as a carrier solvent and active ingredient in aerosol brake cleaners, electrical contact cleaners, mold release agents, and industrial degreasers. nPB's low boiling point and high vapor pressure enable rapid drying after application. Its solvency for lubricants, adhesive residues, and polymer films makes it effective in maintenance and cleaning aerosol products.
Adhesive & Sealant Solvent
Solvent carrier in contact adhesives, spray adhesives, and sealant formulations used in furniture manufacturing, automotive assembly, and construction. nPB dissolves neoprene, polychloroprene, and other synthetic rubber adhesives effectively, providing good open time and strong bond formation. Used in shoe manufacturing, foam bonding, and lamination applications.
Organic Synthesis Intermediate
Versatile alkylating agent and intermediate in organic synthesis. Used to introduce the n-propyl group in pharmaceutical intermediates, agrochemicals, and specialty chemicals via nucleophilic substitution (SN2) reactions with amines, thiols, alcohols, and carbanions. Also used in the synthesis of tripropylamine, propyl esters, and organophosphorus compounds.
Electronics & Semiconductor Cleaning
Electronic-grade nPB is used in the semiconductor and electronics industry for flux removal, PCB cleaning, and precision component degreasing. Its ability to dissolve rosin and no-clean flux residues, combined with low water content and high purity, makes it suitable for cleaning sensitive electronic assemblies where ionic contamination must be minimized.
Dry Cleaning Alternative
Evaluated and used as an alternative to perchloroethylene (PERC) in dry cleaning operations due to its effective solvency for oils, fats, and greases on textiles. Requires closed-loop equipment with solvent recovery systems. Used in specialty dry cleaning applications where PERC substitution is desired, subject to applicable EPA and OSHA regulations for nPB exposure.
Why Source nPB from Texas-Chem?
- 35+ years supplying specialty solvents and halogenated chemicals to Texas industry
- Industrial, technical, ACS reagent, and electronic grades available
- Flexible packaging from 55-gal drums to bulk tanker delivery
- Competitive pricing backed by top-tier producer relationships
- Full regulatory support — SDS, CoA, and compliance documentation with every order
- Same-day quotes for standard quantities