The case of external shapes requires additional elements to be taken into account when compared to taking an internal shape impression. .
The choice of the product is made according to the area to be controlled, its difficulty of control and also according to its external environment. (Orientation, accessibility, etc.)
Plastiform has developed different product consistencies, pasty, fluid or malleable. Each of them can be suitable for external impression taking, although the use of pasty or malleable plastiforms is generally recommended due to their non-flowing properties.
Lorsque la surface à contrôler ne présente pas de forme complexe pouvant When the surface to be inspected does not have a complex shape that can prevent demoulding (no extraction stress), it is recommended to choose a plastiform with a semi-flexible final consistency. As the latter can be sliced by the Double Blade Cutter, their control is much easier. The P35 is the ideal product for this type of situation.
If the constraint is demanding, the most flexible products should be chosen. .
Some of them have been specially developed for the extraction of a complex external shape, allowing the user to extract its shape while keeping the possibility of cutting its profile. These are F20 and P25.