Casein

When sourcing Casein, you must distinguish between Rennet Casein (used for plastics and processed cheese) and Acid Casein (used in beverages and nutrition). Key metrics include Protein Content (typically ≥90% on a dry basis), Moisture Content (≤12%), and Fat Content (≤2%). For food-grade applications, ensure the pH level aligns with your formulation needs and verify the particle size (mesh) to ensure proper solubility and texture in your end product.

For food-grade Casein, suppliers must provide HACCP and ISO 22000 certifications to ensure food safety management. If exporting to the US, FDA Registration is required; for the EU, compliance with EFSA regulations is mandatory. Additionally, depending on your target market, you should request Halal or Kosher certifications, and always verify the Certificate of Analysis (COA) for every batch to check for heavy metals and microbiological limits like Salmonella and E. coli.

Evaluate the solubility and heat stability of the sample, as these are critical for beverage and protein bar production. For industrial use (like adhesives or coatings), test the viscosity and binding strength. It is highly recommended to perform a sensory evaluation to ensure the product has a neutral odor and flavor profile, avoiding any 'milky' off-notes that could affect your final formulation.

The biggest risks include quality inconsistency between samples and bulk orders and damage during transit due to moisture. To mitigate this, use Trade Assurance services on Made-in-China.com to protect your payment. Always insist on pre-shipment inspections (PSI) by third parties like SGS or Intertek to verify that the protein content and purity match the agreed specifications before the balance is paid.

Casein pricing is heavily influenced by global dairy market fluctuations. Negotiate for formula-based pricing linked to international dairy indexes if you are a high-volume buyer. For MOQs, while standard is often 1 metric ton, you can negotiate smaller trial orders by offering to pay a premium on the unit price or by sourcing from suppliers on Made-in-China.com who maintain local warehouse stocks.

Casein is highly sensitive to humidity and odors. Ensure the supplier uses multi-wall paper bags with PE liners and requests dry containers for sea freight. Specify that the cargo must be stored away from heat sources and strong-smelling goods on the vessel. For customs clearance, ensure all Health Certificates and Phytosanitary Certificates are original and accurately reflect the cargo to avoid costly port delays.