Which of the bolded expressions shoul I choose? Thank you.
With regard to bitumen's multiple uses (road building and insulating materials), it is necessary for it to have a good viscosity/adhesive properties, ie ability to bind itself/adhere to rock, wood, paper and other surfaces.
Top answer
e. the ability to bind itself to rock, wood, paper and other surfaces.
— Mister Micawber
e.
the ability to bind itself to rock, wood, paper and other surfaces.
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With regard to bitumen's multiple uses (road building and insulating materials), it is necessary for it to have good adhesive properties, i.e. the ability to bind itself to rock, wood, paper and other surfaces.
Different types of bitumen have different grades (usually denoted as 30/40, 85/100 etc) so you need to include both viscous and adhesive properties (even though the ability to bind refers only to its adhesive property).