3025:
Mechanical applications(coarse weave), with poor electrical properties. Similar to IEC PFCC201. 10 yarn
3025B 3025C 3025CS:
Mechanical applications being economical products versus 3025. 3025CS has abrasion proof property, but it is not recommended to be used as insulation material.
3025D:
Mixed mode backing material. It can substitute for some cotton cloth laminates
3026:
Mechanical properties(fine weave), poor electrical properties, good machining performance. Similar to IEC PFCC203. 21 yarn
3027:
Mechanical and electrical applications(coarse weave), better electrical properties than other phenolic cotton cloth laminates.
3028:
Mechanical and electrical applications(fine weave), better electrical properties than other phenolic cotton cloth laminates. Recommended for small parts. 32 yarn

Properties		Unit	Grade
			3025	3025B		3025C		3025D		3025CS	3026	3027	3028
Flexural strength perpendicular to laminations	≥	MPa	135	130		130		140		70	110	90	100
Impact strength parallel to laminations (Charpy)	≥	kJ/㎡	8.8	7.8		5.0		—		5.0	7.0	7.8	6.0
Bonding strength (≥10mm in thickness)	≥	N	—	5500		5500		—		5500	—	—	—
Dielectric strength perpendicular to lamination (in 90±2℃ transformer oil, 1mm in thickness)	≥	kV/mm	0.82	—		—		—		—	0.82	5.1	6.3
Breakdown voltage parallel to laminations (in 90±2℃ Transformer oil)	≥	kV	1	—		—		14（20±5℃）		—	1	18	20
Permittivity (48-62Hz)	≤	—	—	—		—		—		—	—	5.5	5.5
Insulation resistance after Impregnated in water（D-24/23）	≥	Ω	1×106	—		—		1×107		—	1×106	5×107	5×107
Density		g/㎝3	(1.30-1.40)							(1.30-1.40)
Water absorption (D-24/23, 1.6mm in thickness)	≤	㎎	220		—		—		200	—	220	145	145
Color			Natural							Black	Natural
Reference standard			Q/TXXFR001-2009							Q/TXXFR001-2009