Overview
Carbomer is a synthetic polymer derived from acrylic acid, primarily used as a thickening, suspending, and emulsifying agent. Its ability to form clear, stable gels at low concentrations makes it indispensable in industries like cosmetics and pharmaceuticals. Due to its pH-dependent viscosity, it is often neutralized with bases like triethanolamine to achieve optimal performance. First developed in the 1950s, carbomer has evolved into various grades tailored for specific applications. Its versatility and safety profile have cemented its role in formulations ranging from hand sanitizers to topical medications. Manufacturers value its consistency and ability to enhance product texture without altering color or odor.
Physical and Chemical Properties
Carbomer appears as a white, fluffy powder that swells in water to form viscous gels or solutions. Its viscosity is highly pH-sensitive, peaking at neutral to slightly alkaline conditions. The polymer’s high molecular weight contributes to its exceptional thickening efficiency, often requiring concentrations as low as 0.5–2% in formulations. Chemically, carbomer is a crosslinked polyacrylic acid, which grants it stability under a wide range of temperatures. However, it decomposes upon heating rather than melting. Its solubility is limited to polar solvents, and it is incompatible with strong electrolytes, which can reduce viscosity by disrupting its gel structure.
Main Applications
In cosmetics, carbomer is a cornerstone for gels (e.g., aloe vera gels), lotions, and creams, providing smooth textures and prolonged stability. It also acts as a suspending agent in formulations containing insoluble particles, such as exfoliants or pigments. The pharmaceutical industry relies on carbomer for topical drug delivery systems, including ointments and ophthalmic gels, due to its biocompatibility and controlled-release properties. Additionally, it is used in hair care products (styling gels) and oral care (toothpaste) for its thickening and film-forming abilities.
Safety and Storage
Carbomer is generally recognized as safe (GRAS) for topical use but requires careful handling in powder form to avoid inhalation or eye contact. Dust masks and goggles are recommended during processing. Though non-toxic, undissolved particles may cause mild irritation. Storage conditions are critical to maintaining its efficacy. The powder must be kept in airtight containers away from moisture, which can cause premature clumping or gel formation. Shelf life typically exceeds two years when stored properly at room temperature.
B2B Procurement Guide
When sourcing carbomer, prioritize suppliers with certifications like ISO or GMP to ensure quality consistency. Key specifications to evaluate include viscosity grade (e.g., Carbomer 934 vs. 940), residual solvent levels, and microbial limits. Bulk purchases (e.g., 25 kg drums) often reduce costs by 10–20%, but sample testing is advised to confirm compatibility with existing formulations. Lead times vary; domestic suppliers may offer faster delivery, while international sources might provide cost advantages.
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