Bulk 4-Bromochlorobenzene: Isomer Purity & Melting Point vs Sigma B60428
Para-Isomer Purity in Bulk 4-Bromochlorobenzene: Benchmarking Against Sigma-Aldrich B60428 Specifications
When scaling from R&D to pilot production, procurement managers often seek a bulk alternative to Sigma-Aldrich B60428 that matches the isomer purity of the lab-grade material. 4-Bromochlorobenzene (CAS 106-39-8), also known as 1-Bromo-4-chlorobenzene or p-Bromochlorobenzene, is a critical organic synthesis building block used in agrochemical and pharmaceutical intermediates. The Sigma-Aldrich B60428 product typically specifies a minimum 99% GC purity, with the para-isomer being the dominant component. However, in industrial production, the presence of the ortho- and meta-isomers can influence downstream reaction selectivity. Our bulk material is manufactured via a controlled bromination route that minimizes the formation of the 2-bromochlorobenzene isomer, ensuring a consistent isomer profile that mirrors the lab-grade specification. For exact batch data, please refer to the batch-specific COA, but typical industrial lots exhibit para-isomer content exceeding 99.5% by GC, making it a true drop-in replacement for R&D-developed processes.
Understanding the synthesis route is key to predicting impurity profiles. The industrial manufacturing process for 4-bromochlorobenzene often starts from chlorobenzene with a Lewis acid catalyst, but subtle variations in temperature and bromine feed rate can shift the isomer ratio. Our process knowledge, detailed in our technical article on 4-Bromoclorobenceno: Control De Envenenamiento Del Catalizador De Estrobilurina, highlights how catalyst poisoning control directly impacts isomer purity—a critical factor when this compound serves as a building block for strobilurin fungicides. For Japanese-speaking teams, we also cover this in 4-ブロモクロロベンゼン：ストロビルリン触媒被毒制御. By sourcing from a dedicated global manufacturer like NINGBO INNO PHARMCHEM, you avoid the batch-to-batch variability that can plague generic suppliers.
Melting Point Consistency and Crystal Habit: How 64–67°C Variance Impacts Automated Dosing Systems
The melting point of 4-bromochlorobenzene is typically reported as 64–67°C, but in bulk handling, even a 1–2°C shift can indicate subtle changes in purity or crystal structure. Sigma-Aldrich B60428 lists a melting point of 64–67°C, and our industrial-grade material falls within the same range. However, field experience reveals a non-standard parameter: the crystal habit can vary from fine needles to compact prisms depending on the cooling rate during purification. This affects flowability in automated dosing systems. If your process uses screw feeders or vibratory trays, a batch with predominantly needle-like crystals may bridge or clog, even if the melting point is on-spec. We recommend requesting a particle size distribution or a flowability test if your system is sensitive to crystal morphology. For most liquid-phase reactions, the material is melted and transferred, so the melting point range is the primary concern. Our bulk shipments consistently show an onset melting point of 65.5–66.5°C by DSC, ensuring reliable melting in jacketed vessels.
Another edge case is the behavior of 4-Chlorobromobenzene at sub-ambient temperatures. While the melting point is above room temperature, storage in unheated warehouses during winter can cause the product to solidify into a hard mass if the temperature drops below 60°C. This is normal and does not affect chemical quality, but it requires planning for reheating before use. We supply in 210L steel drums with a removable lid to facilitate melt-out with a drum heater. For large-scale consumers, molten transfers from IBC totes with heating jackets are a more efficient option.
Decoding the Certificate of Analysis: Critical Parameters for Industrial Sourcing of 4-Bromochlorobenzene
A Certificate of Analysis (COA) for bulk para-Bromochlorobenzene must go beyond a simple GC purity number. When evaluating a bulk alternative to Sigma-Aldrich B60428, procurement managers should scrutinize the following parameters, which we routinely report:
| Parameter | Typical Industrial Specification | Sigma-Aldrich B60428 (Typical) | Notes |
|---|---|---|---|
| Assay (GC) | ≥99.0% | ≥99% | Sum of isomers; para-isomer typically >99.5% |
| Isomer Ratio (para:ortho) | ≥200:1 | Not specified | Critical for regioselective reactions |
| Melting Point | 64–67°C | 64–67°C | DSC onset preferred |
| Water Content (KF) | ≤0.1% | Not specified | Important for moisture-sensitive chemistries |
| Appearance | White to off-white crystalline solid | White to light yellow crystals | Color can indicate trace impurities |
| Single Impurity (GC) | ≤0.3% | Not specified | Mainly 2-bromochlorobenzene |
One non-standard parameter we monitor is the color of the molten material. Even if the solid appears white, a slight yellow tint in the melt can indicate trace levels of bromine or iron from the manufacturing process. For applications in electronic materials or high-value pharmaceuticals, this can be a rejection criterion. Our process includes a chelating wash step to remove metal ions, resulting in a melt color of <10 APHA. Always request a COA that includes appearance of the melt if this is relevant to your process.
Bulk Packaging and Logistics for 4-Bromochlorobenzene: IBC Totes, 210L Drums, and Supply Chain Reliability
Transitioning from lab bottles to bulk quantities requires careful consideration of packaging and logistics. Our standard packaging for 4-Bromochlorobenzene includes 210L steel drums (net weight 250 kg) and 1000L IBC totes (net weight 1000 kg). The product is classified as a non-hazardous solid under most transport regulations, but it is sensitive to moisture and should be stored under dry conditions. We use desiccant bags inside each drum and a nitrogen blanket for IBC totes to prevent water absorption during transit. For molten shipments, insulated IBCs with heating elements can be arranged, though this requires special logistics planning. Our supply chain is built on a dual-plant manufacturing strategy, ensuring continuity even during maintenance shutdowns. Lead times for standard packaging are typically 2–3 weeks ex-works, with ocean freight to major ports in 4–6 weeks.
When comparing bulk price to Sigma-Aldrich catalog pricing, the cost-per-kg drops dramatically at the ton scale. While lab-grade B60428 may cost several hundred dollars per kilogram, our industrial high purity grade is priced competitively for multi-ton contracts. We provide a formal quote based on annual volume commitments, with the flexibility to adjust delivery schedules. This makes us a reliable partner for agrochemical manufacturers producing strobilurin fungicides or pharmaceutical companies synthesizing API intermediates.
Frequently Asked Questions
How can I verify the isomer ratio of a bulk 4-bromochlorobenzene shipment?
Request a COA that includes a GC chromatogram with peak integration for the ortho-, meta-, and para-isomers. The para-isomer should elute as the major peak, typically at >99.5% area. If your in-house QC uses a different column or method, cross-validate with a certified reference standard. We can provide a small sample of the specific lot for your lab to run before shipment.
What is an acceptable melting point range for bulk 4-bromochlorobenzene?
For most industrial applications, a melting point of 64–67°C is acceptable. However, if your process involves precise temperature control for crystallization or melt filtration, you may require a narrower range, such as 65–66°C. Discuss your requirements with the manufacturer; we can often select lots that meet tighter specifications.
How does the cost-per-kg scale from lab quantities to pilot production?
Lab-grade 4-bromochlorobenzene from Sigma-Aldrich can cost $200–$500/kg in small bottles. At the 25 kg drum level, the price typically drops to $50–$100/kg. For ton-scale orders, the cost can fall below $20/kg, depending on purity requirements and market conditions. We offer transparent pricing with volume breaks and long-term contract discounts.
Is it millipore sigma or sigma aldrich?
The brand is now MilliporeSigma in the United States and Canada, but the product number B60428 remains the same. Globally, the life science business of Merck KGaA operates as MilliporeSigma in North America and as Sigma-Aldrich elsewhere. When sourcing a bulk alternative, ensure the supplier references the original Sigma-Aldrich product code for specification alignment.
Can 4-bromochlorobenzene be shipped in molten form?
Yes, but it requires specialized equipment. Molten 4-bromochlorobenzene is typically transported in electrically heated IBCs or tank containers with temperature control set at 70–80°C. This reduces handling time at the receiving site but increases freight costs. We can arrange molten shipments for customers with dedicated receiving infrastructure.
Sourcing and Technical Support
Selecting a bulk supplier for 4-bromochlorobenzene means more than matching a CAS number. It requires confidence in isomer purity, melting point consistency, and packaging that fits your process. As a dedicated manufacturer of benzene 1-bromo-4-chloro derivatives, we provide batch-specific COAs, flexible logistics, and technical support to ensure a seamless transition from lab-scale reagents. For a direct comparison to Sigma-Aldrich B60428 and a competitive quote, visit our product page: high-purity 4-bromochlorobenzene for industrial synthesis. Partner with a verified manufacturer. Connect with our procurement specialists to lock in your supply agreements.