Optimization for Tribological Properties of Glass Fiber-Reinforced PTFE Composites with Grey Relational Analysis

Table 6

Response for the signal-to-noise () ratio.

Level
1	−4.447	−3.648	−2.817	−4.395
2	−3.387	−3.415	−3.262	−2.679
3	−2.323	−3.094	−4.079	−3.083
Delta	2.123	0.554	1.262	1.716
Rank	1	4	3	2

The total mean ratio () = −6.84217.