Glass jar 500ml manufacturers

Buyers should prioritize High Borosilicate Glass if the jars are intended for heat-sensitive applications, as it offers superior thermal shock resistance. For standard food storage, Soda-Lime Glass is the most cost-effective and common choice. Ensure the glass is Lead-free and BPA-free to meet food safety standards. Additionally, check the wall thickness consistency to prevent breakage during transit or high-pressure sealing.

For the US market, products must comply with FDA (Food and Drug Administration) regulations. For the EU, LFGB (Lebensmittel- und Futtermittelgesetzbuch) and EU Regulation No 10/2011 are essential. Ensure the supplier provides Third-party Lab Test Reports (SGS, TUV, or Intertek) to verify that no heavy metals leach into the contents. ISO 9001 certification of the factory is also a strong indicator of consistent quality management.

The seal is critical for shelf-life. Request details on the Liner Material (e.g., Silicone, PE, or Plastisol). For vacuum sealing, Lug Caps (Twist-off) are preferred, while Screw Caps are better for dry goods. Verify the Neck Finish (e.g., 70-450 or 82mm) to ensure compatibility with automated filling lines. Ask for a Leak-proof Test Report or samples to conduct a 24-hour inverted leak test.

Suppliers on Made-in-China.com usually offer Silk-screen Printing, Decal Application, Frosting, and Electroplating. For branding, Embossed Logos on the glass mold provide a premium feel but require a higher Initial Mold Cost. Ensure the supplier can provide Pantone Color Matching for lids to align with your brand identity.

Glass is fragile, so you must mandate 5-layer Corrugated Export Cartons and Internal Egg-crate Dividers. For LCL (Less than Container Load) shipments, insist on Palletization with Shrink Wrap and 'Fragile' handling labels. It is highly recommended to purchase Marine Cargo Insurance and negotiate a Breakage Allowance (typically 1-3%) where the supplier replaces items broken in transit.

Focus on Tiered Pricing; glass production is energy-intensive, so unit costs drop significantly as volume increases. Discuss MOQ (Minimum Order Quantity) flexibility—suppliers may lower MOQs if you use a Standard Mold already in production. Always clarify Incoterms (FOB vs CIF) early to avoid hidden logistics costs. Use Secure Payment Terms like Escrow or Letter of Credit for first-time large orders.

Look for the 'Audited Supplier' badge, which indicates the factory has been physically inspected by third-party agencies like SGS or Bureau Veritas. Review their Export Experience to your specific country to ensure they understand local customs documentation. Check the Company Age and Transaction History to distinguish between experienced manufacturers and new trading companies.