Hardlex Glass: Seiko’s Choice from Japan

Seiko has succeeded in creating a high-quality glass that meets all requirements for hardness, protection, and affordability. And Hardlex glass is the result of Seiko’s dedication and research, applied to various types of watch products. Let’s explore it with Mon Luxury!

Understanding Hardlex Glass from A to Z

What is Hardlex Crystal and why is it special? This type of glass is made from Borosilicate glass, a precious material with excellent scratch resistance, water resistance, and high hardness. Seiko has meticulously crafted the production process of this glass, combining chemical treatment and the addition of additives to create a unique and effective material.

Hardlex Glass Seiko's Choice from Japan (2)

What is Hardlex Glass?

Hardlex Crystal is made from Borosilicate glass, one of the most expensive types of glass. Through the process of heating, chemical treatment, and the addition of various additives, this glass has become harder, more scratch-resistant, and waterproof. Particularly, Hardlex Crystal is a type of glass developed and exclusively owned by Seiko.

Additionally, depending on each model, an AR (Anti Reflective Coating) layer may be added to the glass surface – a coating often used to prevent light reflection. When viewed at an angle under sunlight, users can identify this coating by its purple or green hue, with the following applications:

Balancing glare and dazzle, making it easier for users to observe under strong sunlight. Blocking UV rays when sunlight shines on the watch, protecting the eyes and increasing the product’s lifespan. Enhancing aesthetics and durability for the watch, making the glass surface shiny and attractive.

Pros and Cons of Hardlex Glass


Scratch-resistant and durable. High resistance to abrasion. Reasonable price.


Difficult to replace: Since Hardlex Crystal is Seiko’s exclusive product, replacement may be challenging. Limited options: Not all watches are available with Hardlex Crystal glass.

Hardlex Crystal is not only a protective choice for watches but also a symbol of Seiko’s care and effort. With flexibility and high performance, it is a good choice for those who love Japanese watches and are looking for a valuable product.

Hardlex Glass Seiko's Choice from Japan (3)

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Why Does Seiko Use Hardlex Glass for Watches Instead of Sapphire?

Sapphire, with its superior hardness and scratch resistance, has become a popular choice for watch brands. However, Seiko continues to use Hardlex instead of Sapphire, and here’s why:

  1. Affordable Price and Easy Replacement

Affordable cost: Hardlex has lower production costs than Sapphire, suitable for Seiko’s mid-range price segment.

Easy replacement: Hardlex glass is easier to replace than Sapphire, making watch maintenance and repair simpler.

  1. Impact Resistance and Scratch Resistance

Good impact resistance: Hardlex provides better impact resistance than Sapphire, offering better protection for watches in harsh conditions.

Scratch resistance: Although not as hard as Sapphire, Hardlex still offers good scratch resistance compared to other glasses like Mineral Crystal or Acrylic.

  1. Aesthetics and Flexibility

Aesthetics: Hardlex has optimal thickness and is not too thick, creating aesthetic highlights for watches while ensuring quality.

Flexibility: Hardlex can be refined and cut to fit various types of watches, from fashion to sports.

Hardlex Glass Seiko's Choice from Japan (1)


By using Hardlex glass, Seiko not only creates quality watch products but also maintains a balance between performance and price. Although not as hard as Sapphire, Hardlex glass still meets the needs for protection and aesthetics for users. This is one of the factors helping Seiko maintain its position in the watch industry.

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