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Bitumen Packing Paper БУ-Б ГОСТ 515-77 – ztkim.com

Bitumen Packing Paper БУ-Б ГОСТ 515-77

Бумага упаковочная битумированная марка БУ-Б ГОСТ 515-77

Usage

Wrapping hardware, tools, electrodes, electrical engineering products, appliances, industrial products and materials.

Technical specifications

1

Softening temperature of the impregnating composition, and ° C

40-50

2

The ratio of the mass of the impregnating composition to the mass of an absolutely dry base, not less than

0.75

3

Breaking strength under tension, N (kgf), not less than

166.6 (17)

4

Flexibility - on a rod with a diameter of 10 mm at a temperature of (18 ± 2), ° С

no cracks

5

Water resistance under pressure of a water column 50 mm high, no less than

20

6

Water absorption at atmospheric pressure for 3 hours,%, no more

32

7

Mass loss when heated at 70 ° C for 5 hours,%, no more

5.0

8

Fracture strength at repeated bends; number of double bends on average in two directions, no less than

5.0

Dimensions

9

Roll web width, mm

1050 ± 5