Overview
Bisphenol A (BPA) is a synthetic organic compound primarily used as a monomer in the production of polycarbonate plastics and epoxy resins. First synthesized in 1891, BPA gained industrial prominence in the mid-20th century due to its durability and versatility. It is classified as a diphenylmethane derivative and is produced through the condensation of phenol and acetone. BPA's molecular structure features two phenol functional groups connected by a carbon bridge, which contributes to its stability and reactivity. While it has numerous industrial applications, BPA has also been subject to regulatory scrutiny due to potential health and environmental concerns.
Physical and Chemical Properties
BPA appears as white to light brown flakes or powder with a faint phenolic odor. It has a molecular weight of 228.29 g/mol and a density of 1.20 g/cm³. The compound melts at 158-159°C and boils at 220°C under reduced pressure (4 mmHg). BPA is soluble in most organic solvents, including acetone, ethanol, and ether, but only slightly soluble in water (120-300 mg/L at 25°C). Its chemical stability at high temperatures makes it valuable for polymer production. However, BPA can degrade under prolonged exposure to UV light or strong oxidizing agents, which may affect product performance in certain applications.
Main Applications
Approximately 65-70% of global BPA production is used to manufacture polycarbonate plastics, which are valued for their transparency, impact resistance, and heat tolerance. These plastics are common in electronic devices, automotive parts, and food containers. Another 25-30% is used to produce epoxy resins for protective coatings, adhesives, and composite materials. BPA also serves as an additive in thermal paper (e.g., receipts) and as a precursor for flame retardants. In the medical field, it's used in some dental sealants and medical devices. However, many applications involving food contact or children's products have shifted to BPA-free alternatives due to regulatory restrictions.
Safety and Storage
BPA requires careful handling as it may act as an endocrine disruptor, particularly in developmental stages. Workplace exposure limits typically range between 0.05-0.1 mg/m³ (8-hour TWA). Always use appropriate PPE including gloves, goggles, and respirators when handling powdered forms. For storage, keep BPA in original containers or approved alternatives at temperatures below 30°C. The storage area should be dry, well-ventilated, and separate from strong oxidizers. Bulk storage tanks should include secondary containment measures. Shelf life is typically 2 years when stored properly, though manufacturers should verify stability for specific applications.
B2B Procurement Guide
When sourcing BPA, prioritize suppliers with ISO 9001 certification and compliance with regional regulations like EU REACH or US EPA standards. Technical grade (99.5% purity) is standard for most industrial applications, while food-contact or medical applications may require higher purity (99.9%). Consider logistical factors: bulk shipments (25 kg bags or 1,000 kg supersacks) offer cost advantages but require proper handling equipment. Just-in-time delivery may be preferable for smaller operations. Always request SDS documentation and certificates of analysis. For global trade, verify Harmonized System (HS) codes and potential tariff implications.
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