Black float glass

When evaluating Black Float Glass, you must prioritize optical density and color uniformity to ensure no light leakage or streaks. Key specs include thickness tolerance (typically ±0.2mm), flatness (bow/warp rate <0.3%), and visible light transmittance, which for true black glass is often less than 10%. Ensure the glass is produced via the float process rather than simple coating to guarantee that the color is integrated into the glass body, preventing peeling or scratching.

For construction and automotive use, the glass should comply with ASTM C1036 (Standard Specification for Flat Glass) or EN 572-2 (European standard for float glass). If the glass is intended for safety applications, verify ANSI Z97.1 (US) or EN 12150 (EU) certifications for tempered versions. Additionally, ensure the supplier adheres to ISO 9001 for quality management and REACH/RoHS if the glass is used in electronic appliance covers to confirm the absence of hazardous heavy metals.

Request a third-party inspection (such as SGS or Intertek) to perform a fragmentation test (if tempered) and a Zebra angle test to check for optical distortion. You should also demand a cross-cut adhesion test if the glass has any back-painting. For raw float glass, check for bubbles, stones, and inclusions, ensuring the count per square meter falls within Grade A architectural standards.

Black Float Glass is widely used in architectural curtain walls, interior partitions, high-end furniture (tabletops), and household appliances (oven doors, microwave panels). For appliance use, thermal shock resistance is a critical functional requirement. For decorative use, specify the edge grinding quality (e.g., polished C-edge or pencil edge) to ensure safety and aesthetic appeal.

The biggest risk is breakage and moisture staining (glass oxidation). You must mandate the use of seaworthy plywood crates with moisture-proof paper or powder interleaving between sheets to prevent 'glass sweating.' Ensure the supplier uses steel banding and corner protectors for container loading. It is highly recommended to purchase All Risks marine insurance covering 110% of the CIF value.

Focus on Tiered Pricing based on container volume; a Full Container Load (FCL) usually reduces the unit price by 15-20% compared to LCL due to lower handling risks. Negotiate a payment term of 30% deposit and 70% against the Bill of Lading (B/L). For long-term cooperation, ask for a 1-2% breakage allowance or replacement guarantee in the next shipment for any transit damage.

Always use Secured Trading Services provided by Made-in-China.com to protect your funds. Before transferring large sums, verify the supplier's Audit Reports and 'Diamond Member' status on the platform. Conduct a Video Factory Audit to confirm they have the specialized furnace and cutting equipment required for high-quality float glass production.

Be aware of Anti-dumping duties (AD) and Countervailing duties (CVD) that some countries (like the US or EU) impose on Chinese glass products. Check your local Harmonized System (HS) Code (typically 7005.21) to calculate accurate import tariffs. Request a Certificate of Origin (CO) from the supplier to potentially benefit from Free Trade Agreements (FTA) and reduce customs duties.