Effect of Acid Solutions on the Residual Strength of Safety and Rescue Ropes


The article deals with the modern materials that are used to make ropes for sport and industrial needs, their distinctive features and fields of application. The vulnerability to mechanical, thermal and chemical damage is shown. The influence of acid solutions most commonly found in industry or in sport activities in the concentration, in which they are found in various detergents and cleaners, is investigated. The effect of acid solutions at brief and long contact with the rope is shown. Residual strength of the samples after such an exposure was checked. 

The main criterion for visual control is the change in color contrast of the affected area.

Comparison of the residual strength of two samples with braids from different materials when exposed to H2SO4 at a concentration of 45 % for one hour is shown.

The main criteria for tactile control of the damaged area: an increase in the rope rigidity, an increase in the hardness of the braid in the affected areas, and the appearance of braid adhesional structure.  The main condition of the core fibers after rope rupture: partial stretching of the core strands, separation of the braid from the core, stretching of individual strands of the core.

All the options of the effect of acids on the samples are negative, but not every effect can be easily detected. Particularly negative influence of H2SO4 and the highest concentrations of HCl are observed.

The polyester braid of the rope (compared with the polyamide) appeared to be a peculiar masking for detecting the chemical damage. Visually, even under the influence of H2SO4 with a concentration of 45 %, the braid looked better in comparison with other samples, which at this concentration resulted in the briad damage. Therefore, with various combinations of the materials in the construction, it is required to more carefully conduct an inspection of similar technological solutions.

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DOI: 10.24000/0409-2961-2020-2-38-44
Year: 2020
Issue num: February
Keywords : rope chemical damage work at height rope access safety at height