What is Seiko Hardlex Glass? Everything You Need to Know About This Unique Watch Crystal
When you look at the specifications of a Seiko watch, you often come across the term Hardlex glass. Many people wonder exactly what Hardlex is and how it compares to sapphire crystal or mineral glass. Nevertheless, Hardlex has been an important part of Seiko's identity for decades.
In this article, we explain what Hardlex is, why Seiko chooses it, and for which watches it is the right choice.
What is Hardlex?
Hardlex is a specially hardened mineral glass developed by Seiko itself. It is designed to be more resistant to shocks and daily use than standard mineral glass. On the Mohs hardness scale, Hardlex glass scores a 7, while sapphire crystal scores a 9.
Due to its ideal combination of hardness and flexibility, Hardlex is a popular choice for sports watches that are worn intensively. It is hard enough to be difficult to scratch and flexible enough to withstand impacts.
Why does Seiko use Hardlex?
Seiko deliberately chooses Hardlex for a large number of its collections. The brand seeks a good balance between durability, reliability, and wearing comfort.
Hardlex offers several advantages:
- more shock-resistant than standard mineral glass
- clear readability
- durable for daily use
- ideal for sports watches
- developed by Seiko itself
For many Seiko models, Hardlex is therefore a logical choice.
Hardlex or sapphire crystal?
A frequently asked question is which glass is better?
Sapphire crystal is harder and therefore more scratch-resistant. Hardlex, on the other hand, is less hard but can be more resistant to breakage or damage from a hard impact. Due to the hardness of sapphire crystal, it can sometimes splinter more easily upon impact than Hardlex glass, which is somewhat more flexible.
That's why Seiko chooses the most suitable material depending on the model and its intended use.
Within premium collections such as certain Prospex and Presage models, sapphire crystal is often used, while other models use Hardlex.
Is Hardlex suitable for daily use?
Yes. Hardlex was developed for people who wear their watch daily.
Whether you work in an office, are on the go, or have an active hobby, Hardlex offers good protection against the influences of everyday use.
That is precisely why it remains one of the most widely used types of glass in the Seiko assortment.
Frequently asked questions
Is Hardlex the same as mineral glass?
No. Hardlex is based on mineral glass, but it is extra hardened by Seiko to improve durability.
Can Hardlex scratch?
Yes. Hardlex is more scratch-resistant than standard mineral glass, but less scratch-resistant than sapphire crystal.
Why doesn't Seiko use sapphire crystal everywhere?
Seiko chooses the material for each collection that best suits the design, application, and desired properties of the watch.
Is Hardlex a good choice?
For daily use, Hardlex is a reliable and durable solution that has proven itself for decades.
Discover Seiko at Jeweler Van de Heyning
At Jeweler – Watchmaker Van de Heyning, we are happy to help you choose the right Seiko watch. Whether you prefer Hardlex or sapphire crystal, we advise you based on your use, wishes, and budget.