Glass wool sheet

When evaluating glass wool sheets, the most critical factor is Density (typically ranging from 10kg/m³ to 96kg/m³), as it directly impacts thermal conductivity and sound absorption. You must verify the Thermal Conductivity (K-value), which should ideally be ≤ 0.041 W/m·K at 25°C. Additionally, ensure the material is classified as Grade A1 Non-combustible according to EN 13501-1 or ASTM E84 standards to meet fire safety requirements.

Professional buyers should prioritize suppliers who hold CE, ISO 9001, and ISO 14001 certifications. For health safety, check if the product is Formaldehyde-free and carries the EUCEB (European Certification Board for Mineral Wool Products) seal, which guarantees the fibers are biosoluble and not hazardous to health. Always request a Material Safety Data Sheet (MSDS) before finalizing the purchase.

Glass wool sheets are versatile: Plain sheets are used for general wall insulation, while Aluminium Foil-faced (FSK) sheets are essential for HVAC ductwork to provide a vapor barrier and prevent condensation. For acoustic applications, such as theaters or recording studios, specify Black Tissue-faced glass wool to enhance sound absorption and provide a clean aesthetic finish.

The Thickness (usually 25mm to 100mm) determines the R-value (thermal resistance); thicker sheets provide better insulation. Furthermore, the Fiber Diameter (ideally <6μm) is crucial; finer fibers create more air pockets, leading to superior thermal performance and better tensile strength, which prevents the sheet from sagging over time.

The main challenge is the high volume-to-weight ratio, which can lead to expensive shipping costs. To mitigate this, ensure the supplier uses Vacuum Compression Packaging, which can reduce the volume by up to 3-4 times. However, you must verify that the material has a high resilience rate so it returns to its original thickness immediately after unpacking.

Always utilize the Secured Trading Service on Made-in-China.com to protect your payment until delivery is confirmed. When negotiating, request a Pre-shipment Inspection (PSI) by a third party like SGS or Intertek to verify the density and fire-resistance grade. For bulk orders, negotiate a staggered payment term (e.g., 30% deposit, 70% against B/L copy) to balance risk.

Check your local Anti-dumping Duty (ADD) regulations, as some regions impose high tariffs on glass fiber products from specific origins. Ensure the HS Code (typically 7019.39) is correctly declared on all documents (Commercial Invoice, Packing List) to avoid customs delays and ensure the supplier provides a Certificate of Origin to benefit from applicable Free Trade Agreements.