Types of Release Paper for Synthetic Leather & Selection Guide

What Is Release Paper for Synthetic Leather, and What Is Leather Paper?

Release paper for synthetic leather is an engineered paper or film that serves as both a casting substrate and a texture mold. It is coated with a non-stick layer—typically silicone, polypropylene, or a specialty polymer—that allows the cured polyurethane or PVC layer to detach cleanly while preserving micro-scale surface details. Without release paper, creating consistent grain patterns, from full-grain leather replicates to geometric embosses, would be nearly impossible at production scale.

The term “leather paper” is a common but informal name for this same material. When users search for leather paper, they are almost always referring to the release paper used to manufacture synthetic leather, rather than a finished product. It is important to distinguish it from finished leather-look craft paper: true leather paper in the industrial sense is an intermediate tool, not a consumer-facing material.

Different Types of Release Paper

Release papers are categorized by base substrate, coating chemistry, surface finish, and thermal resistance. The table below summarizes the most common types found in synthetic leather manufacturing.

Silicone-coated papers dominate high-temperature PU leather lines because of their exceptional release stability and resistance to thermal degradation. Embossed varieties are indispensable for reproducing specific leather grains like saffiano or crocodile, with pattern fidelity lasting 15 to 25 cycles on average. PET films, while less reusable, provide optical clarity and are often chosen for transfer-coating processes where the film becomes part of the final product or where a disposable carrier is preferred.

What Is the Best Release Paper to Use?

There is no single “best” release paper—the optimal choice depends on your resin system, desired surface finish, production line speed, and cost-per-meter target. Use the following decision criteria to guide your selection:

• Resin chemistry and cure temperature. If your line runs solvent-based PU and cures at above 200°C, a silicone-coated paper is essential to prevent sticking and coating transfer. For water-based systems with lower cure temperatures, polypropylene-coated or cast papers can perform well at a lower cost.
• Surface finish requirements. For high-gloss patent leather effects, a mirror-gloss silicone paper with a surface roughness below 0.5 micron Ra is critical. For natural matte finishes, polypropylene-coated or fine-grit embossed papers avoid unwanted shine while maintaining a soft hand feel.
• Reusability and cost-efficiency. A paper that delivers 30 reuse cycles at $5 per linear meter translates to a media cost of roughly $0.17 per meter of leather produced, excluding waste. In contrast, a single-use PET film at $0.50 per meter may be more economical only for very short runs or where texture replication is absolute priority.
• Grain complexity. Deep embosses with vertical walls require a release paper with high hot strength and a flexible coating that can release without tearing the cured resin. Embossed papers with a specialty resin layer typically perform better here than standard silicone-coated papers.
• Line speed and web handling. High-speed coating lines operating at 15–30 meters per minute demand papers with consistent caliper and low static generation. Premium cast papers and thicker PET films reduce web breaks and misalignment, minimizing downtime.

A common best practice is to run validation trials with two or three candidate papers on your actual resin system, tracking defects such as pre-release, pattern washout, and static marks over the full reuse cycle window. Manufacturers that adopt this data-driven approach report achieving an optimal balance between initial cost and per-cycle performance, often settling on a silicone-coated embossed paper for premium runs and a polypropylene-coated matte paper for commodity lines.