Table 2. Size Distribution of the Wear Particles (%)

Sieve size (μm)	NR1	NR2	NR3	NRBR1	NRBR2	NRBR3
1,000	94.1	91.1	15	70.1	46.6	9.3
500	4.8	7.8	31.3	16.4	36.0	17.6
212	1.1	1.1	52.8	13.4	17.4	69.5
106	trace	trace	0.9	0.2	trace	3.6
63	−	trace	trace	trace	trace	trace
38	−	−	−	trace	trace	trace