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Immunity of nitrile butadiene rubber and polytetrafluoroethylene in brines in underground kimberlite mines

The article presents the studies into improvement of operation efficiency of highpressure vertical split casing pumps which are the rapidly developing process equipment in Russian mines at the moment. One of the main causes of failure of centrifugal pumps is the low efficiency of artificial sealing rubbers used in operations with mine water due to the low service properties of elastomeric materials. The authors propose to create sealing rubbers for operation in the extreme environment using nitrile butadiene rubbers BNKS-18 and BNKS-26 which contain 0.5 to 50 ppm of ultra disperse polytetrafluoroethylene; to study resistance of the composites to the severely aggressive brines sampled on the levels of –300, –400 and –480 m in Udachny kimberlite mine; and to investigate the physical and mechanical properties, as well as the durability of the test materials. It is shown that filling rubbers with fluoropolymer improves operating ability of the test materials at shots of fluoropolymer at 0.5 and 50 ppm. The BNKS-26-based rubbers have nominal tensile strength higher by 30% as compared with the BNKS-18-based rubber, while the latter has durability higher by 14%.

Keywords: process equipment effectiveness, high-pressure vertical split casing pump, sealing rubber, nitrile butadiene rubber, ultra disperse polytetrafluoroethylene, mine brine resistivity, durability, physical and mechanical properties.
For citation:

Portnyagina V. V., Petrova N. N., Danilov A. A. Immunity of nitrile butadiene rubber and polytetrafluoroethylene in brines in underground kimberlite mines. MIAB. Mining Inf. Anal. Bull. 2024;(2):63-75. [In Russ]. DOI: 10.25018/0236_1493_2024_2_0_63.

Issue number: 2
Year: 2024
Page number: 63-75
ISBN: 0236-1493
UDK: 622.5
DOI: 10.25018/0236_1493_2024_2_0_63
Article receipt date: 22.05.2023
Date of review receipt: 07.07.2023
Date of the editorial board′s decision on the article′s publishing: 10.01.2024
About authors:

V.V. Portnyagina1, Cand. Sci. (Eng.), Assistant Professor, e-mail:, ORCID ID: 0000-0001-9562-7663,
N.N. Petrova1, Dr. Sci. (Chem.), Professor, e-mail:, ORCID ID: 0000-0001-7699-7511,
A.A. Danilov1, Graduate Student, Research Engineer, e-mail:, ORCID ID: 0009-0004-2378-962Х,
1 M.K. Ammosov North-Eastern Federal University, 677000, Yakutsk, Republic of Sakha, Russia.


For contacts:

A.A. Danilov, e-mail:


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