instruction:
Translate the given Spanish text to English
question:
The gel is substantially free of biocides.
answer:
El gel está sustancialmente libre de biocidas.


question:
A pliable material overlays the proximity sensors.
answer:
Un material flexible solapa los sensores de proximidad.


question:
The upper end (16) of the screw (5) is hexagonal.
answer:

El extremo superior (16) del husillo (5) es hexagonal.