Paper sizing agent

Buyers must focus on the Active Content percentage, pH stability range, and ionic charge (cationic or anionic). For Internal Sizing Agents like AKD (Alkyl Ketene Dimer), ensure the solid content is typically between 12% and 20% for optimal emulsion stability. For Surface Sizing Agents, verify the viscosity (measured in mPa.s) to ensure compatibility with your sizing press equipment and desired Cobb value reduction.

For paper intended for food packaging, the agent must comply with FDA 21 CFR 176.170 or BfR Recommendation XXXVI. Ensure the supplier provides a Material Safety Data Sheet (MSDS) and check for ISO 9001 (Quality Management) and ISO 14001 (Environmental Management) certifications to guarantee consistent chemical composition and sustainable production practices.

Request a Cobb60 test report to measure water absorption resistance. Evaluate the mechanical shear stability to ensure the chemical does not break down in high-speed paper machines. Additionally, test for compatibility with other wet-end chemicals like retention aids and fillers to prevent chemical spots or scale buildup on the paper wire.

Analyze the Total Cost of Ownership (TCO) by calculating the dosage rate per ton of paper rather than just the price per kg. High-concentration agents may have a higher unit price but lower transportation and storage costs. Seek suppliers on Made-in-China.com who offer Flexitank or IBC tank packaging, which can reduce logistics costs by 15-20% compared to standard drums.

The main risks include leakage, temperature-induced degradation, and customs delays due to improper labeling. Ensure the supplier uses UN-approved packaging and provides a Certificate of Analysis (COA) for every batch. For sea freight, confirm the stowage requirements (e.g., away from heat sources) to maintain chemical efficacy.

Utilize Secured Trading Services provided by platforms like Made-in-China.com to protect your payment until delivery is confirmed. Negotiate a staged payment term (e.g., 30% deposit, 70% against BL copy) and insist on a pre-shipment inspection (PSI) by third parties like SGS or Intertek to verify the chemical concentration before the balance is paid.

Check for Anti-Dumping Duties (ADD) on specific chemical categories in your country. Ensure the supplier provides a GHS-compliant label in the destination country's language. For hazardous or sensitive chemicals, verify if a Dangerous Goods (DG) declaration is required, even if the product is classified as non-hazardous, to avoid port storage penalties.