Flexible Ultra-Thin Glass (UTG) Chemically Strengthened Cover for Foldable Displays

Introduction

The demand for Flexible Ultra-Thin Glass (UTG) has surged with the rise of foldable smartphones, tablets, and wearable devices. As a chemically strengthened cover material, it provides unmatched durability, clarity and flexibility, making it the preferred choice for next-generation foldable displays. Unlike traditional glass, Ultra-Thin Glass can bend repeatedly without cracking, ensuring long-term reliability in flexible electronics.

This product description explores the key features, benefits, and applications of Flexible UTG, explaining why it outperforms plastic-based alternatives and standard tempered glass.

In Weiman, we offer UTG customization service under your design including shapes, sizes(tolerance), color patterns, coatings and bondings to meet customer’s diverse need. 

What is Ultra-Thin Glass (UTG)?

It’s a specialized type of glass with a thickness typically ranging from 30 to 100 micrometers (µm). It is manufactured using a precise down-draw or float glass process, followed by chemical strengthening to enhance its durability.

Key Characteristics:

Extremely thin yet strong (comparable to polymer films but with superior hardness)

Highly flexible (can withstand over 200,000 bends without failure)

Optically clear (better light transmission than plastic alternatives)

Scratch-resistant (hardness of 6H or higher on the Mohs scale)

Ultra-Thin Glass is increasingly used in foldable smartphones, rollable TVs, and flexible wearables, replacing traditional plastic covers like polyimide (PI) due to its premium feel and enhanced durability.

Why Choose Chemically Strengthened UTG?

The chemical strengthening process involves immersing Ultra-Thin Glass in a molten potassium nitrate (KNO₃) bath, creating a compressive stress layer on the surface. This makes the glass:

More shatter-resistant than thermally tempered glass

Thinner yet stronger, ideal for lightweight foldable devices

Better touch sensitivity (no air gaps, unlike laminated plastic films)

Compared to plastic-based covers, chemically strengthened UTG offers:
✔ Higher scratch resistance (no visible wear after prolonged use)
✔ Superior optical clarity (no yellowing or haze over time)
✔ Smoother surface (better stylus and finger touch response)

Applications of Flexible UTG in Foldable Displays

Flexible Ultra-Thin Glass is revolutionizing the display industry, particularly in:

Foldable Smartphones

Leading brands like Samsung, Huawei, and Motorola use UTG covers in their foldable phones (e.g., Galaxy Z Fold, Mate X) for a premium glass-like feel without sacrificing flexibility.

Rollable & Bendable TVs

LG and TCL have showcased rollable OLED TVs with Ultra-Thin Glass as the top layer, ensuring durability while maintaining ultra-thin form factors.

Wearable Devices

Smartwatches and AR/VR glasses benefit from glass’ lightweight and flexibility, enabling curved displays without compromising strength.

Advantages Over Plastic-Based Alternatives

While polyimide (PI) films were initially used in foldable screens, the glass has become the superior choice due to:

Conclusion: For high-end foldable devices, it’s the clear winner.

FAQ

Q1: How do we know if the glass applicable to our applications?
A1: UTG (Ultra‑Thin Flexible Glass) is mainly applied for foldable phone displays, wearable devices, flexible touch panels and optical cover lenses. Its ultra‑thin property enables repeated bending while maintaining high light transmittance and surface hardness. If your product among them, just contact us.

Q2：What is the difference between UTG glass and CPI film?
A2：It is real thin glass with better scratch resistance, high optical clarity and anti‑aging performance.
CPI is polymer film. UTG outperforms CPI on surface hardness, yet CPI has advantages in extreme bending radius.
They are two mainstream cover materials for flexible screens.

Q3:How thin is the glass?
A3:Commercial the glass normally ranges from 0.03 mm to 0.1 mm in thickness.
Ultra thin thickness supports flexible bending, meanwhile chemical tempering treatment improves its impact resistant performance for end product usage.