Transparent Polyimide Tape (Colorless PI Tape / CPI Film Tape / Clear Heat-Resistant Insulation Tape) – Silicone or Acrylic Adhesive for Displays, Cameras & Semiconductor Alignment

1. Product Overview

Nomay Transparent Polyimide Tape is a clear heat-resistant insulation and process-protection tape manufactured with colorless polyimide (CPI) or high-transparency polyimide film. It is designed for applications that require heat resistance, electrical insulation and visual alignment at the same time.

Unlike conventional amber polyimide tape, the transparent backing allows operators, cameras or inspection systems to observe alignment marks, barcodes, components and protected surfaces through the tape. Transparent appearance alone does not mean that every grade is optical-grade, residue-free or suitable for all high-temperature processes.

2. Product Construction

• Backing: Colorless PI (CPI) or high-transparency polyimide film
• Backing Thickness: 0.0125–0.050 mm
• Adhesive: Transparent high-temperature silicone or transparent acrylic pressure-sensitive adhesive
• Adhesive Side: Single-sided
• Total Thickness: 0.035–0.080 mm
• Available Appearance: Colorless transparent, light-yellow high-transparency or slightly hazy transparent
• Optional Liner: Transparent release liner for precision conversion and die-cutting
• Product Forms: Log rolls, slit rolls, liner-backed rolls, transparent windows, frames and custom die-cut parts

3. Backing & Adhesive System

Colorless PI and high-transparency PI films provide heat resistance, electrical insulation and dimensional stability while maintaining improved visibility compared with standard amber PI film. Film chemistry should be selected according to transmittance, haze, yellowness, refractive index, thermal stability and post-heating color requirements.

Transparent silicone adhesive is the common choice for higher-temperature processing, conformability and removable masking. Transparent acrylic adhesive is available for applications requiring a non-silicone adhesive surface or more permanent bonding. Complete silicone-free construction, optical cleanliness and residue requirements must be confirmed separately.

4. Key Features & Buyer Benefits

• Transparent backing supports visual alignment and in-process inspection
• Heat-resistant PI construction protects components during thermal processing
• Electrical insulation supports electronic and precision assembly applications
• Multiple adhesive options help match temperature, residue and silicone-control requirements
• Thin and dimensionally stable film supports narrow-width slitting and precision die-cutting
• Transparent windows and frames can expose alignment marks, barcodes or inspection areas
• Custom thickness, width, roll length, liner and die-cut geometry are available for evaluation

5. Applications

• Transparent masking and alignment protection in display manufacturing
• Camera module and optical component insulation with retained visibility
• FPC protection during soldering, bonding and high-temperature assembly
• Heat-resistant protection for semiconductor carrier barcodes and process labels
• Transparent window and frame die-cuts for precision electronic assembly
• Heat-resistant electrical insulation in medical-equipment manufacturing where internal conditions must remain visible and no direct human contact is involved

6. Industries

• Display and touch-panel manufacturing
• Mobile device and camera-module assembly
• Flexible printed circuit and electronics manufacturing
• Semiconductor and wafer-processing operations
• Barcode, label and identification protection
• Optical component and sensor assembly
• Medical-equipment manufacturing for non-direct-contact parts
• Precision converting and die-cut component production

7. Application Scenarios / Problems Solved

Display Alignment:
Process – Lamination, bonding or thermal processing of display components.
Problem – Amber tape blocks alignment marks and makes visual positioning difficult.
Function – Transparent PI film provides protection while keeping reference marks visible.
Result – Improved positioning, inspection efficiency and process control.
Confirm – Required transmittance, haze, temperature and allowable yellowing.

Camera Module Protection:
Process – Assembly and thermal treatment around camera or optical modules.
Problem – The protected area must remain visible for alignment and inspection.
Function – Thin transparent PI backing combines insulation with visual access.
Result – Easier inspection without removing the temporary protective layer.
Confirm – Optical cleanliness, adhesive type, residue limit and die-cut tolerance.

Semiconductor Label Protection:
Process – Thermal processing of carriers, trays, barcodes or wafer-related labels.
Problem – Identification information must remain readable during processing.
Function – Transparent heat-resistant film protects the label while preserving visibility.
Result – Reduced risk of damaged or unreadable process identification.
Confirm – Barcode readability, temperature profile, dwell time and post-process removal.

Medical-Equipment Manufacturing:
Process – Assembly of insulated parts that require observation of internal status.
Problem – Conventional opaque insulation can obstruct visual inspection.
Function – Transparent PI tape provides insulation and observation access.
Result – More convenient manufacturing inspection for non-direct-contact components.
Confirm – Regulatory, cleanliness and biocompatibility requirements separately; these are not supplied by default.

8. Technical Specifications

• Backing Material: Colorless PI (CPI) or high-transparency polyimide film
• Backing Thickness: 0.0125–0.050 mm
• Total Thickness: 0.035–0.080 mm
• Adhesive Options: Transparent silicone or transparent acrylic PSA
• Width Range: 2–500 mm
• Common Widths: 3, 5, 6, 9, 10, 12, 15, 19, 25, 38 and 50 mm
• Standard Roll Lengths: 20, 33 and 50 m
• Appearance: Colorless transparent, light-yellow high-transparency or slightly hazy transparent
• Product Forms: Rolls, liner-backed rolls, windows, frames and custom die-cut parts
• Optical Indicators: Transmittance, haze, yellowness, refractive index and post-heating yellowing must be confirmed by grade
• Model / Product Code: To Be Confirmed by Nomay

9. Performance & Operating Conditions

General grades are recommended for approximately -40°C to 150°C operating conditions. Selected high-temperature CPI film and silicone adhesive constructions may be evaluated for continuous use up to 200°C. Selected products may also be evaluated for short-term exposure up to 260°C.

The final temperature rating must be confirmed according to exposure time, substrate, pressure, optical requirement, allowable yellowing, adhesive residue and removal conditions. A tape may remain physically intact after high-temperature exposure while no longer meeting the required optical performance.

Before production use, evaluate transmittance, haze, initial color, post-heating yellowing, dimensional change, adhesion, edge lifting, residue and barcode or alignment-mark readability under the actual process conditions.

10. Comparison & Selection Guide

Colorless CPI or High-Transparency PI vs. Standard Amber PI:
Choose transparent PI when visibility, optical alignment or barcode reading is required. Choose standard amber PI when transparency is unnecessary and established general-purpose high-temperature masking performance is the priority.

Silicone Adhesive vs. Acrylic Adhesive:
Choose transparent silicone adhesive for higher-temperature masking, flexibility and removable applications. Choose transparent acrylic adhesive when a non-silicone adhesive option or stronger permanent bonding is required. Confirm whether the entire construction must be silicone-free.

Colorless Transparent vs. Light-Yellow or Slightly Hazy Grades:
Choose according to required visual clarity, transmittance, haze, allowable yellowness and cost. Do not select solely by the description “transparent.”

Roll Tape vs. Liner-Backed Die-Cut Parts:
Choose slit rolls for general masking and wrapping. Choose liner-backed windows, frames or precision die-cuts for repeatable positioning, optical openings and automated assembly.

11. Technical Notes + FAQ

Q: Is every transparent polyimide tape optical-grade?
A: No. Optical-grade suitability requires confirmed transmittance, haze, yellowness, surface cleanliness and post-heating optical performance.

Q: Can the tape withstand 260°C?
A: Selected constructions may be evaluated for short-term exposure up to 260°C. Exposure time, adhesive behavior, yellowing and residue must be tested under the actual process.

Q: Will transparent PI tape turn yellow after heating?
A: Yellowing depends on CPI chemistry, adhesive type, temperature and dwell time. Specify the allowable post-heating yellowness before grade selection.

Q: Is the tape guaranteed residue-free?
A: No universal residue-free claim applies. Residue performance depends on surface, pressure, temperature, time and removal conditions.

Q: What is the difference between transparent PI and amber PI?
A: Transparent PI improves visibility and alignment capability, while amber PI is commonly used for conventional high-temperature masking and insulation where optical visibility is unnecessary.

Q: Is a silicone-free version available?
A: Transparent acrylic adhesive can be evaluated, but the complete construction must be reviewed if the application requires strict silicone-free control.

Q: Can custom die-cut shapes be supplied?
A: Transparent windows, frames and precision die-cut parts can be evaluated according to drawings, tolerance and liner requirements.

Q: Are RoHS, REACH, halogen-free, UL, FDA or medical documents included?
A: RoHS, REACH and halogen-free documentation may be available for selected grades but must be confirmed. UL, FDA and medical biocompatibility are not supplied by default.

12. Inquiry CTA

Request a sample, specification review or quotation from Nomay Tape. Please provide your application, required film type, transmittance, haze, allowable post-heating yellowing, adhesive preference, continuous and peak temperature, exposure time, bonding surface, thickness, width, roll length, die-cut drawing, cleanliness level, residue requirement, electrical requirement, compliance documents and estimated order quantity.