PET Release Film Silicone Release Liner
PET Release Film 25 Micron are characterized by their outstanding release properties in combination with the known polyester film characteristics like extremely high internal strength, excellent dimensional stability, low heat shrinkage, excellent stiffness
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Product Introduction
Description
PET Release Film is a biaxially oriented polyester (BOPET) film with a precision silicone release coating - available in solventless or solvent-based silicone systems - engineered as a high-performance release liner for pressure-sensitive adhesives, protective films, heat transfer films, and industrial tape manufacturing.
The PET substrate provides the mechanical backbone: extremely high internal strength, excellent dimensional stability under tension, low heat shrinkage through thermal processing, and consistent caliper across the full web width. The silicone coating delivers controlled, stable release force - formulated to match your adhesive system, from ultra-light (3 g/inch) for delicate optical films to heavy (600 g/inch) for aggressive industrial adhesives.
Supplied in thicknesses from 23 μm to 100 μm, on 1-inch or 3-inch cores, in rolls or sheets. Standard and custom slit widths available.
Product Features
High-Strength BOPET Substrate
The biaxially oriented polyester base delivers exceptional tensile strength and dimensional stability. Resists stretching, necking, and deformation under tension during coating, laminating, die-cutting, and automatic dispensing - reducing web breaks and maintaining registration accuracy.
Low Heat Shrinkage
PET's inherent thermal stability - with minimal shrinkage through adhesive curing cycles, hot-foil stamping, and thermal lamination - ensures the release liner remains dimensionally stable. No curling, no warping that could cause registration drift or adhesive-layer distortion.
Wide Release Force Range: 3–600 g/inch
Release force is customized to your application:
Ultra-light (3–20 g): optical films, medical dressings, delicate adhesives
Standard (20–100 g): pressure-sensitive labels, general-purpose liners
Medium (100–300 g): protective films, heat transfer films
Heavy (300–600 g): aggressive adhesives, high-speed automated converting
Solventless or Solvent-Based Silicone
Two silicone systems available:
Solventless: Thermal-cure, low VOC, preferred for food-contact and environmentally sensitive applications
Solvent-based: Traditional system, wider formulation flexibility for specialized release requirements
Specify your preference when inquiring - our team will recommend the optimal system for your application.
Excellent Surface Quality
Smooth, defect-free surface with controlled silicone coat-weight distribution. No gels, fisheyes, or coating skips that could transfer to the adhesive layer. Clean release preserves adhesive performance - no silicone residue, no bond-strength degradation.
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Technical Specifications
Parameter Specification Base Material BOPET (Biaxially Oriented Polyester) Thickness Range 23, 25, 36, 50, 75, 100 μm Silicone Type Solventless or solvent-based Release Force 3–600 g/inch (application-specific) Core Size 1 inch (25 mm) or 3 inch (76 mm) Format Rolls or sheets Width Custom - standard and slit widths available Color Transparent (standard) Heat Shrinkage Low - PET-grade dependent Tensile Strength High - BOPET standard Packaging PE film wrap on both sides + wooden pallet MOQ Low - small orders welcome Sample Free (quality evaluation before bulk order)
Release Grade Selection
| Grade | Release Force | Recommended Application |
|---|---|---|
| Ultra-Light | 3–20 g/inch | Optical films, medical dressings, delicate transfer adhesives |
| Light | 20–100 g/inch | Standard pressure-sensitive labels, graphic films |
| Medium | 100–300 g/inch | Protective films (PET/PE), electronic product films |
| Heavy | 300–600 g/inch | Aggressive adhesives, high-speed automated converting, industrial tapes |
Applications
Pressure-Sensitive Label & Graphic Film Liner
Release liner for paper and film-based pressure-sensitive labels. The PET substrate's dimensional stability ensures accurate die-cutting, clean matrix stripping, and consistent label placement in automatic dispensing systems.
Protective Film Liner
Backing liner for PET and PE protective films used in electronics, automotive, appliance, and construction applications. The release film protects the adhesive layer during manufacturing, slitting, die-cutting, and installation - peeling cleanly when the protective film is applied.
Heat Transfer Film Carrier
Release liner for heat transfer films and tapes used in textile printing, label transfer, and decorative application. The PET film withstands the heat and pressure of the transfer process while releasing cleanly after application.
Adhesive Tape Manufacturing
Release liner for single-sided and double-sided adhesive tapes, foam tapes, and specialty bonding tapes. Available with differential release coating for two-liner tape constructions.
Electronics & Component Protection
Process liner and protective carrier for flexible printed circuits, EMI shielding materials, thermal interface pads, and precision electronic components where clean, particle-free release is critical.
Why Source from Weshare
Small MOQ welcome - trial orders accommodated for new project development and market testing
Free pre-production samples - test release force, coat quality, and compatibility with your adhesive before committing
Short lead times - efficient production scheduling with competitive delivery
Consistent batch quality - in-line monitoring and batch release-force testing ensure roll-to-roll consistency
Responsive technical support - prompt inquiry response with application-specific recommendations
FAQ
Q: What is the difference between solventless and solvent-based silicone?
A: Solventless silicone is thermal-cure with near-zero VOC emissions - preferred for food-contact, medical, and environmentally regulated applications. Solvent-based silicone offers wider formulation flexibility for specialized release requirements. Both deliver clean, stable release. Our team will recommend the optimal system based on your application.
Q: What release force should I choose for my application?
A: It depends on your adhesive type and converting process. Light release (3–20 g/inch) for delicate films and medical products. Standard release (20–100 g/inch) for general labels. Medium to heavy (100–600 g/inch) for aggressive adhesives and high-speed automated lines. See the Release Grade Selection table above. We recommend testing samples to confirm compatibility.
Q: What thickness of PET release film do I need?
A: 23–25 μm: lightweight liners, optical films. 36–50 μm: standard label and protective film liners. 75–100 μm: heavy-duty applications requiring higher stiffness and handling durability. Our team can recommend based on your converting equipment and end-use requirements.
Q: Can I order custom slit widths?
A: Yes. Provide your required roll width and core size (1-inch or 3-inch) for a quotation. Standard and custom widths are available.
Q: Do you supply release film in sheet format? A: Yes. In addition to roll format, we can supply sheeted release film to your specified dimensions.
Q: How do I get samples for testing?
A: Free samples are available for quality evaluation. Provide your required thickness, release force range, and silicone type preference. Samples are dispatched promptly - test on your equipment and with your adhesive before placing a bulk order.
Q: What is your minimum order quantity?
A: We maintain a low MOQ policy - small trial orders are welcome for new projects. Contact us with your specification for a tailored quotation.
Q: How is the film packaged for export shipping?
A: Each film surface is wrapped with PE film for protection, then the rolls or sheets are packed on plywood pallets for container loading. This packaging method protects the silicone-coated surface during transit.
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