Latex glove raw materials

When sourcing raw latex, the Total Solid Content (TSC) and Dry Rubber Content (DRC) are the most critical metrics, typically requiring a TSC of 60% or higher for natural latex. For NBR latex, the Acrylonitrile (ACN) content determines the chemical resistance; a medium to high ACN content is preferred for industrial-grade gloves. Additionally, monitor the pH level (usually 9.0-11.0) and viscosity to ensure compatibility with your dipping line machinery.

Suppliers must provide COA (Certificate of Analysis) for every batch. For medical-grade gloves, ensure the raw materials are compatible with EN 455 or ASTM D3577/D6319 standards. If the end product is for food handling, the raw materials must comply with FDA 21 CFR 177.2600 or EU Regulation No. 10/2011. Always verify the low protein content in natural latex to minimize Type I allergy risks.

Beyond the base latex, you must source high-purity vulcanizing agents (Sulfur), accelerators (such as ZDEC or ZDBC), and antioxidants. It is vital to ensure these additives are dispersion-grade to prevent clumping in the dipping tank. For powder-free gloves, inquire about polymer coating materials or chlorination chemicals that improve the donning properties of the final product.

The Mechanical Stability Time (MST) is a key indicator; high-quality latex should have an MST of over 650 seconds to withstand the mechanical shear during the compounding and dipping processes. Low stability leads to coagulum formation, which causes pinholes and uneven thickness, significantly increasing the rejection rate of the finished gloves.

Latex is a commodity sensitive to weather and oil prices. It is recommended to use Forward Contracts or Formula-based Pricing tied to the SICOM or TOCOM exchange rates. On Made-in-China.com, look for 'Diamond Members' who offer price lock-in options for long-term supply agreements to stabilize your production costs.

Liquid latex is a hazardous-sensitive cargo that must be shipped in ISO Tanks or Flexibags. It is highly temperature-sensitive; ensure the shipping route avoids extreme cold to prevent irreversible coagulation (freezing). Always request temperature-controlled containers if shipping during winter months and verify that the supplier uses anti-fungal agents to prevent spoilage during long sea transits.

Utilize the Audit Reports available on Made-in-China.com, which are conducted by third-party agencies like SGS or Bureau Veritas. Request a pre-shipment sample from the specific production lot you intend to buy and perform a lab-scale dipping test. For large-scale orders, hiring a third-party inspector to witness the loading and seal the ISO tank is a standard security measure.

For bulk latex, CIF (Cost, Insurance, and Freight) is common, but FOB (Free on Board) gives you more control over the shipping line's quality. Ensure the contract specifies the allowable moisture loss percentage during transit and clearly defines the point of title transfer. Always include a clause for independent weight verification at the port of discharge to avoid disputes over volume discrepancies.