<p>In the context of a personal project I would like to reproduce the appearance of a commercial product of which I send you a cropped image.</p>

<p>I would also like to point out that I do not have the object in question, but it would seem that it is made from a polymer.  </p>

<p>The product is a case with an embedded electronical card, so heat dissipation is important.</p>

<p>I'm interested by what kind of plastic is really used here. I plan to have the part manufactured by a company, so I think the method used will be SLS</p>

<p>I therefore rely on your expertise in the field of 3D printing to try to identify the material used.</p>

<p><a href="https://i.stack.imgur.com/3WtzK.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/3WtzK.png" alt="enter image description here"></a></p>

<p>Thanks</p>

Is there anything else about this object, but its picture? Softening temperature, biodegradability, is it stiff of flexible, hard or soft, anything could help identifying its material.
Also, post-processing (sanding down or chemicals like acetone bath) greatly enhances the range of filaments that can be used.
Just from the picture, my first guess would be: it looks very much like what ceramic powder added filaments can yield with when you sand them down afterwards. Take a look at pictures of prints with LayBrick, CERAMO, etc.
On second thought,
the answer is: Polyamide/Nylon
. It must be either a polyamide case or polyamide coating of some other material. For home projects, MJF polyamide prints can easily be ordered online. Ordering polyamide coating of plastic parts can be trickier depending on your location, although definitely doable.
Going with Nylon at home prints may require a non-basic 3D printer and some expertise.