Quartzite

When sourcing quartzite, you must prioritize Mohs hardness (typically 7) to ensure it is genuine quartzite and not marble. Key specs include water absorption rates (ideally <0.5%), compressive strength (min. 150 MPa), and slab thickness tolerance (±1mm). For high-end projects, verify the polishing glossiness level, which should exceed 85-90 degrees for a premium finish.

Perform an acid sensitivity test and a scratch test. Genuine quartzite will not react to lemon juice or vinegar and will scratch glass. Many suppliers mislabel stones; therefore, requesting a petrographic analysis report or a mineral composition certificate is essential to confirm the high silica content required for true quartzite durability.

Ensure the products meet ASTM C615 (Standard Specification for Granite Dimension Stone, often used as a benchmark for quartzite) or EN 12670 standards. For environmental compliance, look for GREENGUARD Gold certification to ensure low chemical emissions, and verify that the supplier provides a Material Safety Data Sheet (MSDS) regarding silica dust management during fabrication.

Polished finishes are ideal for luxury kitchen countertops and vanity tops due to their stain resistance. Honed or leathered finishes are better suited for high-traffic flooring or outdoor wall cladding as they provide better slip resistance and hide fingerprints or water spots more effectively.

The biggest risks are breakage during transit and container overweight surcharges. Ensure the supplier uses reinforced A-frame wooden crates that are ISPM-15 fumigated. Demand photographic evidence of the loading process to confirm that slabs are secured with steel wires and timber bracing to prevent shifting in the maritime container.

Negotiate based on yield rates and slab sizes; larger 'jumbo' slabs often command a premium but reduce seams in installation. Use Made-in-China.com's Secured Trading services to hold payment until a third-party pre-shipment inspection (PSI) confirms the color consistency, vein matching, and absence of structural fissures or 'dry veins'.

Verify the Harmonized System (HS) Code (typically 2506.20) to determine import duties in your country. Because stone is heavy, sea freight is the only viable option; calculate your Total Landed Cost by including port handling fees, heavy-lift charges, and local trucking from the port to your warehouse using specialized stone-carrying vehicles.

Always verify the supplier's Business License and Export Qualification through Made-in-China.com's audited supplier reports. Avoid direct wire transfers to private accounts; instead, use Letter of Credit (L/C) for large volumes or Escrow-based payment systems to ensure the funds are only released once the Bill of Lading (B/L) and quality certificates are verified.