TS 3423-1 EN ISO 2897-1

TS 3423-1 EN ISO 2897-1 is a standard for the designation of impact-resistant polystyrene (PS-I) materials for moulding and extrusion. This part defines a designation system and a basic framework that can be used when setting up specifications, providing a common technical language for identifying and describing PS-I materials.

Purpose of the designation system

In general technical use, a designation system helps communicate a plastic material’s identity and intended technical profile in a concise, structured form. For the polystyrene family, this is important because moulding and extrusion grades may share the same polymer base while differing in processability, impact behaviour, and end-use intent. The PS-I designation identifies the impact-resistant polystyrene class, distinguishing it from general-purpose polystyrene in a way that is useful for procurement, documentation, and specification drafting.

What this part covers in practice

The scope given for this document is a designation system and a foundation for specifications rather than a full product performance specification. Standards of this kind help align producers and users on how the material should be named and referenced, so the same grade is described consistently across technical documents, orders, and specification sheets. That makes it easier to compare materials and to state which characteristics are being used as the basis for selection.

• PS-I: the impact-resistant polystyrene material class
• Materials intended for moulding and extrusion
• A designation framework that supports specification work
• A common basis for consistent technical identification

As a part standard, this document should be understood within the broader PS-I standard family. Its role is to organise identification and specification logic, not to describe every requirement for the material itself. In practice, such a system supports clearer communication between suppliers and users and helps ensure that the same material type is referenced in a consistent way.