Duplex board grey back

When evaluating Duplex Board (Grey Back), the most critical factor is the Grammage (GSM), typically ranging from 230gsm to 450gsm. You must ensure the Whiteness and Gloss levels of the coated side meet your printing requirements (usually 78-82% whiteness for standard grades). Additionally, check the Stiffness (Taber Stiffness) in both Machine Direction (MD) and Cross Direction (CD) to ensure the board can support the weight of the packaged goods without collapsing. For high-speed printing, verify the Surface Smoothness (PPS) and Ink Absorption rates to prevent smudging or uneven coloring.

For food-grade packaging, the board must comply with FDA (US) or ISEGA (EU) certifications to ensure it is safe for indirect food contact. If your brand prioritizes sustainability, look for FSC (Forest Stewardship Council) or PEFC certifications, which guarantee the wood pulp is sourced from responsibly managed forests. Furthermore, ensure the supplier provides RoHS and REACH compliance reports to confirm the absence of heavy metals and hazardous chemicals in the coating and recycled pulp layers.

Duplex Board with a Grey Back is a multi-layer material; the top layer is made of bleached chemical pulp for high-quality offset printing, while the middle and bottom layers consist of recycled waste paper. This makes it an economically feasible choice for outer packaging of pharmaceuticals, electronics, and toys. However, due to the recycled content, it has lower moisture resistance than Virgin Ivory Board. If the usage scenario involves cold chain or high humidity, you should request a moisture-proof coating or specific sizing agents to be added during production.

The biggest risk is moisture damage during sea transit, which can cause the board to warp or lose stiffness. To mitigate this, insist on seaworthy packaging, including plastic film wrapping, corner protectors, and strong wooden pallets. Another risk is batch-to-batch color inconsistency. You should request a Golden Sample and use a third-party inspection service to verify that the bulk production matches the sample's whiteness and thickness before final payment.

Duplex board pricing is highly sensitive to raw material (waste paper) fluctuations. It is advisable to negotiate a formula-based pricing for long-term contracts. For MOQs, while standard production runs require 20 tons (one 20ft container), you can negotiate a lower MOQ if the supplier has stock sizes (e.g., 700x1000mm or 800x1100mm) available. Always ask for tiered pricing—increasing your order from 20 tons to 50 tons can often yield a 3-5% discount due to optimized production efficiency.

Paper is heavy and low-value per cubic meter, so Ocean Freight is the only viable option. Ensure the supplier provides an accurate Packing List and Commercial Invoice with the correct HS Code (typically 481092) to avoid customs delays. Be aware of anti-dumping duties that some countries (like India or the US) may impose on paper products from specific regions. Always confirm the Incoterms; CIF or CFR are common, but FOB gives you more control over the shipping timeline and local port charges.