PA 12 and PA 12s: how they differ in practice

PA 12 and PA 12s are polyamide engineering materials used in industrial 3D printing with MJF technology for both prototypes and serial production. In 3D printing, they are known for stable mechanical properties, wear resistance, and suitability for functional parts.

Both materials belong to the same class and are largely interchangeable, so the difference between PA12 and PA12S is not always obvious. Let’s look at how this difference appears in practice and when it actually matters.
Therefore, choosing between them based on “reliability” or strength does not make sense — in most cases, the result will be the same.

Where the differences are

The differences appear in the surface, tactile feel, and appearance after painting.

PA 12s has a smoother surface. This is noticeable when in contact with the part and may be important for products that the user interacts with. Due to this same factor, in some cases there is slightly softer friction, but for most applications this is not critical.

PA 12S also provides a more even and neat coating after painting.
At the same time, without painting, the materials are visually almost indistinguishable.

What this means for selection

The differences matter only in applications where appearance or tactile characteristics are important. This is the key point in deciding between PA12 vs PA12S.

If the product is not painted and does not involve user contact, there will be no difference between PA 12 and PA 12s.

If the appearance after painting or the feel of the surface is important, PA 12s will be preferable.

PA 12 and PA 12s are materials with very similar performance characteristics and minimal differences.

The difference lies in the surface and appearance, not in strength. Therefore, the choice is simple: if tactile feel and appearance after painting matter — use PA 12s. In all other cases, PA 12 delivers the same result.