Agar

For Food Grade applications, the most critical metric is Gel Strength (measured in g/cm²), typically ranging from 700 to 1200 g/cm². You must also verify the mesh size (usually 80-100 mesh for powder) to ensure proper solubility. For Pharmaceutical or Microbiology grades, the ash content must be <3% and the gelatin temperature should be strictly controlled between 32°C and 45°C to ensure stability in culture media.

As a food additive (E406), Agar must comply with JECFA (FAO/WHO) standards. Ensure the supplier provides ISO 22000 or HACCP certifications for food safety. For export to specific markets, HALAL and KOSHER certifications are often essential. If purchasing for lab use, look for USP/EP (United States/European Pharmacopoeia) grade compliance to ensure high purity and low mineral content.

Agar is primarily derived from Gracilaria or Gelidium seaweed. Gelidium-based Agar is considered premium due to its higher melting point and superior clarity, making it more expensive and preferred for high-end lab work. Gracilaria-based Agar is the industry standard for food applications due to its cost-effectiveness and excellent gelling properties when treated with alkali.

Agar is highly hygroscopic. It must be stored in a cool, dry, and well-ventilated warehouse away from strong odors. When properly sealed in double-layer PE bags inside fiber drums or cartons, it has a shelf life of 24 to 36 months. Buyers should request moisture content analysis (should be <15%) to prevent premature degradation or clumping during transit.

The primary risk is adulteration or dilution with cheaper starches or konjac powder. To mitigate this, always request a Pre-Shipment Inspection (PSI) and a Certificate of Analysis (COA) for every batch. Use Made-in-China.com's Secured Trading services to ensure payment is only released after quality verification. Additionally, be wary of prices significantly below market average, as this often indicates low gel strength.

Agar prices fluctuate based on seaweed harvest seasons. It is best to negotiate long-term supply contracts to lock in prices. For new buyers, start with a sample order (1-5kg) to test gel strength in your specific application. Standard MOQs are usually 100kg to 500kg, but you can negotiate a tiered pricing structure where a 1-ton order yields a 10-15% discount compared to smaller volumes.

Agar is classified under HS Code 130231. Ensure the supplier provides a Material Safety Data Sheet (MSDS), even though it is non-hazardous, to facilitate smooth customs clearance. For sea freight, use moisture-proof containers or desiccants. If shipping to the US or EU, ensure the labeling complies with local food additive regulations, including clear batch numbers and expiration dates.