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Grey Backing PET Displays Materials
Polyester film with light-stabilized grey adhesive and opaque backing designed for electronic display lamination and backlight masking.
Manufactured by Shanghai Hanker Industrial Co., Ltd.
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Product Overview
Grey Backing PET Displays Material is a multilayer composite film engineered for optical assembly applications where light blocking and dimensional stability are required. The construction comprises a clear polyethylene terephthalate (PET) carrier film coated with a permanent, pigmented grey adhesive and laminated to a release liner. The grey opacity serves to neutralize light transmission and provide uniform background coloration when viewed through transparent displays or touch panels.
This material is manufactured in ISO Class 7 cleanroom environments to minimize contamination risk during lamination. The PET substrate is selected for minimal shrinkage under thermal cycling, maintaining registration in capacitive touch sensor stacks. The adhesive system is formulated with low outgassing characteristics for sealed electronic assemblies.
PET Carrier Thickness
25µm, 38µm, 50µm (±2µm)
Adhesive Type
Acrylic, pressure-sensitive, grey pigmented
Liner Type
Clear PET / White kraft
Optical Density
0.6 - 1.2 (550nm)
Product Parameters
Measured values for optical, dimensional, and adhesive performance under controlled laboratory conditions (23°C/50%RH).
Physical & Optical
| Total Thickness (excluding liner) | 50µm - 90µm (film + adhesive) |
| Transmission (550nm) | < 5% (optical density dependent) |
| Haze (PET carrier) | < 1.5% |
| Gloss (60°) | 110-130 GU |
Adhesive Performance
| Peel Adhesion (90° to steel) | 8 N/25mm - 14 N/25mm |
| Loop Tack (stainless steel) | 12 N/25mm - 18 N/25mm |
| Shear Resistance (1kg/1"x1") | > 10,000 minutes |
| Dynamic Friction (film to glass) | 0.35 - 0.45 µk |
Environmental Stability
| Thermal Shrinkage (150°C/30min) | < 0.2% MD/CD |
| Outgassing (Total Mass Loss) | < 0.1% (ASTM E595) |
| Humidity Resistance | 85°C/85% RH, 500h |
| Operating Temperature Range | -20°C to 100°C |
Note: Grey color tolerance is ΔE ≤ 0.5 under D65 illumination. Adhesive properties are specific to high-surface-energy substrates.
About Shanghai Hanker Industrial Co., Ltd.
Shanghai Hanker Industrial Co., Ltd. is China Grey Backing PET Displays Materials Manufacturers and Wholesale Grey Backing PET Displays Materials Suppliers. With over 20 years of industry experience, we have grown into a fully-integrated enterprise capable of producing a complete range of products across the entire industrial chain.
2004-2005
Company Foundation
Shanghai Hanker Industrial Co., Ltd began preparations in 2004 and was officially registered and established in 2005. The DPI brand was founded in the same year, marking the beginning of our journey in the adhesive materials industry.
2012
Expansion of Production Base
To enhance the influence and market share of the DPI brand, we expanded our production base to Nanhuating Industrial Park in Fengxian District, Shanghai. The facility covers 25,000 square meters and employs over 160 people, equipped with modern production workshops and advanced equipment including silicone coating machines, laminating machines, and automated punching machines.
2016
New Manufacturing Facility in Jiangsu
We established Jiangsu DPI New Materials Co., Ltd. in Qidong, Jiangsu Province, covering 34,000 square meters. This facility is equipped with China's leading calendering machine, high-standard silicon coating machines, and PE coating machines, enabling independent production of raw materials like PVC calendering film and release paper.
Present
Industry Leadership and Innovation
Today, Hanker has developed into a fully-integrated enterprise with comprehensive capabilities across upstream, midstream, and downstream industrial chains. We hold over 65 invention and utility model patents, and our high-quality DPI products are sold to more than 80 countries worldwide.
Certifications & Quality Standards
National High-tech Enterprise
ISO9001 Quality Management
ISO14001 Environmental Management
Shanghai Contract-abiding Enterprise
Environmental Commitment
We actively uphold our environmental protection responsibilities by utilizing advanced RTO equipment, achieving a 99.9% waste gas treatment rate. We encourage full employee participation in environmental practices and support sustainable development through tangible actions.
Product Benefits
Material properties that provide functional advantages during display module assembly and long-term component operation.
Active Area Border Definition
Grey adhesive provides neutral density masking of display periphery without metallic reflectance or edge glow.
Bubble Entrapment Reduction
Microstructured adhesive channels allow planarization of screen-printed silver inks and circuit traces.
Die-Cut Edge Definition
PET carrier exhibits clean kiss-cut and through-cut edges without filamentation or adhesive stringing.
Product Features
Specific construction parameters selected to address handling requirements and optical performance criteria in display stacks.
- Anti-Block Liner: Matte finish silicone release prevents telescoping during slitting
- Conformable Adhesive: 20µm - 35µm coating that flows around 5µm-10µm step heights
- ITO Compatible: Non-corrosive formulation for transparent conductive films
- Laser Markable: Grey surface accepts Nd:YAG laser marking for QR codes
- Halogen-Free: Compliant with IEC 61249-2-21
- Dual-Liner Option: Laminated on both sides for overlay stacking applications
Product Applications
Integration contexts within display modules and human-machine interface components requiring controlled light management.
LCD Bezel Masking
Adheres to rear chassis or metal frame to prevent backlight bleed through pinholes and vent features.
- Notebook Displays: 25µm carrier for tight hinge clearance
- Automotive Clusters: 50µm carrier for die-cut rigidity
Touch Sensor Lamination
Bonded to rear of PET-based ITO sensors as protective layer and optical masking.
- Projected Capacitive: Grey adhesive matches sensor trace color
- Resistive Touch: Die-cut gasket for bottom substrate termination
Display Driver Shielding
Covers COG (Chip-on-Glass) and FOG (Flex-on-Glass) bond lines to obscure silver paste and ACF residues.
- Smart Wearables: Contoured die-cuts for circular display cutouts
Lamination Parameter Reference
| Substrate | Recommended Adhesive Thickness | Roll Lamination Pressure | Dwell Time (Full Bond) |
|---|---|---|---|
| Glass (soda lime) | 25µm | 0.3 - 0.5 MPa | 24h @ 23°C |
| Polycarbonate | 35µm | 0.2 - 0.4 MPa | 48h @ 23°C |
| PMMA (Acrylic) | 50µm | 0.15 - 0.3 MPa | 72h @ 23°C |
Handling & Processing
ESD Control
Surface resistivity 10^11-10^12 Ω/sq; use ionized air during liner removal to prevent particulate attraction.
Blade Selection
50µm carrier requires 25°-30° bevel blade. Excessive blade temperature (>40°C) causes adhesive deposition on blade face.
Cold Slitting
Slitting below 15°C induces adhesive shock and edge ooze. Maintain material temperature at 20°C-25°C during conversion.
Inspection Lighting
Use cross-polarized illumination to distinguish grey adhesive layer from PET carrier during QC inspection.
Frequently Asked Questions
Clarification on technical specifications, material compatibility, and storage parameters for display-grade adhesives.
What is the function of the grey color versus black or white adhesives?
Grey pigmentation provides neutral density light absorption without the high opacity of carbon-black adhesives. It also presents a neutral color when viewed through semi-transparent mirror coatings, whereas black adhesive appears as a stark void.
Does this product contain conductive components for EMI shielding?
Standard Grey Backing PET is non-conductive. For EMI grounding paths, specify nickel-coated copper particle variants. The grey color in standard product is achieved with non-metallic pigments.
Can this material be used for direct bonding to OLED panels?
Yes, provided the PET carrier is specified as low-birefringence grade to prevent rainbow effects under polarized sunglasses. Standard PET exhibits retardation; request optical-grade isotropic PET.
How is optical density controlled across different production lots?
Grey adhesive is produced via gravure coating with in-line densitometry feedback. Carbon black loading is adjusted within ±0.5% to maintain OD tolerance. Certificates of Analysis include measured OD at 550nm.
What causes edge lift on ITO-coated glass and how is it prevented?
ITO surfaces exhibit surface energy below 38 dynes/cm after cleaning. Surface treatment via oxygen plasma or UV-ozone immediately prior to lamination raises surface energy >50 dynes/cm for adequate wet-out.
Interested in DPI Color Cutting Vinyl?
As a direct manufacturer with over 20 years of experience, Shanghai Hanker Industrial offers competitive pricing, flexible order quantities, and comprehensive technical support for our DPI brand products.
