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  • Author: Pavel Otřísal x
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A Possible Approach To The Quality Of Breathing Organs Protective Equipment’s Exhalation Valve Assessment

Abstract

One of the most important parts of most equipment designated for breathing organs protection is an exhalation valve which basically determinates the quality of breathing organs protective equipment. Its quality and technical properties affect the quality of protective equipment as the whole set in a strong way. That is why an extraordinary attention has to be devoted in terms of the exhalation valve quality assessment. An aim of information is to point to some problems related to the evaluation of the breathing organs protective equipment quality.

Open access
Assessment of Chemical Resistance of Barrier Materials based on Practical Application of Conductometry

Abstract

A paper deals with basic theoretical approaches for conductometry employment and its possibilities within testing chemical resistance of barrier materials. A classical conductometry is one from the oldest electro-analytical methods which deals with a measurement of conductivity of solution in water or even another solvent with high relative permittivity when comes to dissociation of an electrolyte on ions. Within employment of conductometric test for evaluation of chemical resistance of barrier materials used in anti-gas protection of the Czech Armed Forces Chemical Corps specialists based theoretical principles have been used. Their application, however, have reached a certain degree of rationalization such as the employment of special carbon electrodes, ensuring temperature compensation within performing long measurements and ensuring mixture of the electrolyte.

Open access
Evaluation of Breakthrough Time Of Selected Chemical Warfare Agents Through Protection Materials Under Static Conditions Within the Interlaboratory Methods Comparison

Abstract

Based on long-term experiences cooperation between the Laboratory of Toxic Compounds at the National Institute for Nuclear, Chemical and Biological Protection and the Nuclear, Chemical and Biological Defence Institute of the University of Defence in Brno an interlaboratory double-sided comparison has been established in recent time. The interlaboratory comparison of methods is one of several quality management tools according to ČSN EN ISO/IEC 17 025:2005. In the Czech Republic a commercial available comparison system for breakthrough time determination of chemical warfare agents through protection material actually does not exist. In fact the methods are somewhat narrowly focused. Several procedures for evaluation of protection materials properties to drops and steams of soman or sulphur mustard under static conditions have been performed. Detection of chemical warfare agents has been realized by using suitable chromogenic indicator. This article summarises evaluation of the realised interlaboratory comparison

Open access
Study of the Change of the Specialists' Isolative Garment Properties Against the Effects of Peroxide Decontamination Mixture

Abstract

The influence of the peroxide decontamination mixture on the barrier polymeric material used for the construction of the anti-gas protective garment OPCH-05 has been study. This kind of mixture is used with the help of the decontamination vehicle ACHR-90 and its EDS mixture. The both soldiers and operators of the ACHR-90 or the EDS mixture can be in a direct contact with spattering decontamination mixture that can cause significant damages of the anti-gas protective garment OPCH-05. For evaluation of protective properties and their potential changes the MIKROTEST method and methodology has been used. This paper is another publication which deals with the influences of decontamination mixtures introduced in the Czech Armed Forces Chemical Corps armament on the barrier material composed of the butyl-rubber polymeric mixture in combination with the polyamide textile.

Open access
The Czech Armed Forces Chemical Corps Specialists’ Protection In Relation To Security Threats And Their Impacts On Some Trends Of Decontamination Development

Abstract

Current decontamination mixtures which are established within the Czech Armed Forces are designated for decontamination of all types of surfaces and they are very often prepared by specialists with practically no knowledge related to their destructive properties. The Czech Armed Forces Chemical Corps specialists are challenged to relatively new security threats concerning fight Chemical Warfare Agents and Toxic Industrial Materials in all type of military operations. The aim of the article is to discuss some security threats and some new trends within decontamination and point to the some influences on the Czech Armed Forces Chemical Corps specialists´ personnel protection.

Open access
Specification of Destructive Influences of Selected Decontamination Mixtures on Materials Used for Construction of Chemical Specialists´ Garments Designated for Isolative Protection of the Body Surface

Abstract

A paper deals with the influence of selective decontamination mixtures established in the Czech Armed Forces on an isolative protective foil used to the construction of anti-gas protective garment marked as OPCH-05. Presented information are a part of thematically focused works aimed to study of influences of all established decontamination mixtures on the Czech Armed Forces Chemical Corps´ garments of anti-gas protection. The quality of provided the Czech Armed Forces Chemical Corps´ specialists isolative protection is limited with the existence of several aspects which significantly determine with their materials equipment. For providing isolative protection of the body surface are used such as protective garments which are the hermetic type and they are constructively solved with the employment of the butyl-rubber polymeric mixture. The effective protection of the body surface must be guaranteed even within the presumption of a repeated contact with decontamination mixtures

Open access
Resistance of Barrier Materials Against Toxic Compounds Permeation and Its Evaluation in Accordance with New European Norms

Abstract

Study of barrier material resistance against permeation of toxic compounds belongs to a category of chemical warfare agents and toxic industrial chemicals are permanently insufficiently solved problems. This work deals with changes in approaches to testing barrier materials against toxic compounds permeation in static and dynamic conditions. An aim of this information is to describe specifications of cancelled norms of ČSN EN ISO 6529 (2002) a ČSN EN 374-3 (2004) with newly established norms ČSN EN 16523-1 a 16523-2 (2015). Authors focused on specification and comments of changes in such parts of norms concerning their scope, terms and definitions. A selected problem was solved with the help of analyse of newly established norms in a form of comments. Conditions for specification of understanding of mentioned problems in a context of established or occasionally prepared methods of testing resistance barrier materials against toxic compounds permeation have been formed with elaborated research.

Open access
The Influence of Decontamination Mixture of ODS-4 on Chemical Resistance of the Garments for Body Surface Isolative Protection of the Czech Armed Forces Chemical Corps Specialists

Abstract

Providing effective isolative protection of the Czech Armed Forces Chemical Corps’ specialist is long-term, developed and perspective problems. In current time established protective garments designated for hermetical body surface protection of the Czech Armed Forces Chemical Corps’ specialist are constructively solved with the employment of a mixture based on a butyl-rubber polymeric mixture both-sided coated on a polymeric fabric. Effective protection of a body surface has to be guaranteed for the whole time of usage of a protective garment, thus after performed repeated decontamination. The paper deals with influences of decontamination mixtures ODS-4 on the isolative protective foil used for production of anti-gas protective garment marked as OPCH-05 which is established as the garment for specialists’ body surface protection.

Open access
Chemical Resistance of Textile with a Butyl-Rubber Polymeric Mixture Against Decontamination Mixture on the Base of Chlorinated Aliphatic and Aromatic Hydrocarbons

Abstract

Used equipment for providing hermetic isolative protection of the Czech Armed Forces Chemical Corps specialists’ body surface is currently solved with the employment of a mixture based on butyl-rubber. By producers declared protective properties of used barrier material does not mention a potential influence of decontamination mixtures and their components on the change of protective properties. A paper deals with selected chemical properties of butyl-rubber and points to the destructive influences of selected decontamination mixtures on protective textile used to production of isolative hermetic protective equipment. Study of barrier material chemical resistance against permeation of selected chemical compounds and mixtures creates the base presumption for evaluation of its usability.

Open access
Chemical Warfare Agents Permeation Through Layered Adsorption Materials

Abstract

The adsorption of permeating chemical compounds on the textile materials active surface is one of many principles of personal protection against dangerous chemical compounds including chemical warfare agents. The adsorption principle is generally known. However, its effective application especially in connection with the enhancing protection efficacy follows certain significant rules. A development of new textile materials based on the application of adsorbents in the combination with nanofibrous materials is the main topic of contemporary research in this area. This contribution sums up the theoretical basis of adsorption-based protective efficacy and also brings new experimental results of sorption and permeation of live CWA agents and their simulants through different samples of layered composite materials. Results are related to the basic structural parameters of nanotextiles and applied adsorbents.

Open access