TS ISO 9211-1

TS ISO 9211-1 is a terminology standard for optical coatings in optics and photonics, setting out the basic terms used to describe these coatings and the way they are specified. This part provides a common language for surface-treated components and substrates with optical coatings, while excluding ophthalmic optics such as spectacles. It is concerned with defining and describing the subject, not with prescribing how a coating process must be carried out.

Why terminology matters in optical coatings

Optical coatings are thin-film surface treatments used to control reflection, transmission, absorption, and phase behavior of light. In practice, the field includes concepts such as reflective coatings, anti-reflection coatings, filter coatings, and related film structures. A terminology standard helps ensure that these terms are used consistently, which is essential in technical documentation, procurement language, and product specification. General technical context: the same physical coating can be described differently if the terminology is not controlled, leading to misunderstanding in design and testing communication.

What this part supports

• A standard vocabulary for identifying optical-coated components and substrates.
• A framework for expressing general characteristics and, where needed, test and measurement methods.
• No process method requirement for how the coating is manufactured.
• An explicit exclusion of ophthalmic optics, including spectacles.

As part of the ISO 9211 series, this document supports clearer specification and more consistent technical communication across optical coating applications. Its main value is conceptual discipline: separating coating types, substrate descriptions, and performance-related language so the same terms are understood in the same way.