COMPARISON BETWEEN COTS OF VARIOUS CONSTRUCTIONS
 
   
FEATURES
PLAIN COTS
SPRING GRIP COTS THREAD
PVC CORE COTS
ALUCORE COTS
Construction
Single Layer
Three Layer
Two Layer
Two Layer
Expansion after Mounting (Approx.)
1.5 mm
1 mm
0.2 - 0.3 mm
0.1 mm
Surface stress in Cot after mounting
Very much
High
Negligible
Nil
Adhesive for mounting
Required
Not required
Not required
Not required
Waiting period for initial grinding after mounting
24 hrs. (Minimum)
Nil
Nil
Nil
Grinding after mounting
More
More

Minimum (Because of less expansion & pre-ground finish)

Minimum
User-Friendliness
Least
Least
Excellent
Good