Circular glasses

Offer

Material

Circular glasses are manufactured of borosilicate glass. Increased resistance is obtained by thermal prestressing.

Determination of glass thickness

s = 0,55 ⋅dm ⋅√(p⋅S/10 ⋅ σbB]

s: theoretical minimum glass thickness (mm)

dm: average value of internal and external gasket diameter

d1: external diameter of glass and gasket

d2: internal gasket diameter

p: maximum permissible pressure (bar)

σbB: minimum bending resistance(N/msq m)

S: safety coefficient

Bending resistance

≥ 160 N/mm²

Thermal resistance

• standard: -273°C ÷ 300°C
• glasses of dimensions: 31.75×12.7 to 356°C

Thermal expansion coefficient

α 20/300≤4,3 x 10-6 x K-1 wg DIN 52328

Transformation temperature

tg = 550°C sprawdzone wg DIN 52324

Thermal resistance

• Resistance to class I acids according to DIN 12116,
• Resistance to class II alkalis according to ISO 675,
• Resistance to class I water according to ISO 719

Dimensions (mm)

size		maximum pressure	gasket
diameter	s	bar	d1	d2	thickness
31,75	12,7	175	1)	1)	1)
40	12	50	42	30	1,5
45	10	40	47	32	1,5
45	12	50	47	32	1,5
50	10	25	52	35	1,5
50	12	40	52	35	1,5
60	10	16	62	45	1,5
60	12	25	62	45	1,5
60	15	40	62	45	1,5
63	10	16	65	48	2
63	12	25	65	48	2
63	15	40	65	48	2
70	12	25	72	55	2
80	12	16	82	65	2
80	15	25	82	65	2
80	20	40	82	65	2
90	10	10	92	75	2
100	10	8	102	80	2
100	15	16	102	80	2
100	20	25	102	80	2
100	25	40	102	80	2
110	20	25	112	90	2
120	10	8	122	100	2
125	15	10	127	100	2
125	20	16	127	100	2
125	25	25	127	100	2
150	15	8	152	125	2
150	20	10	152	125	2
150	25	16	152	125	2
150	30	25	152	125	2
170	15	8	172	140	2
175	20	10	177	150	2
175	25	16	177	150	2
175	30	25	177	150	2
200	20	8	202	175	2

1) gaskets and mica for steam level gauges of high parameters

Items, for which no dimensions were provided in DIN 7080 and ÖNORM M 7353 standards, are written in bold letters.