Composite railway post insulators picture, drawing, and specifications:

Code No.	H±20	h	h1	h3	h4	D	d1	d2	L	power frequency withstand voltage -kV		lightning impulse withstand voltage -kV	Mechanical failing load -kN		slip load -kN
										dry	wet		cantilever	tension
	760	490	90	20	30	185	62	21	1200	160	130	270	8	80	20
	760	490	90	20	30	185	62	21	1200	160	130	270	12	100	25
	800	490	90	20	30	185	62	23	1200	160	130	270	16	120
	760	490	90	20	30	185	62	21	1400	175	140	290	8	80	20
	760	490	90	20	30	185	62	21	1400	175	140	290	12	100	25
	800	490	90	20	30	185	62	23	1400	175	140	290	16	120
	800	520	90	20	30	200	62	21	1600	190	150	310	8	80	20
	800	520	90	20	30	200	62	21	1600	190	150	310	12	100	25
	800	520	90	20	30	200	62	23	1600	190	150	310	16	120