{"id":20214,"date":"2026-04-17T08:54:37","date_gmt":"2026-04-17T08:54:37","guid":{"rendered":"https:\/\/lenard.tech\/?post_type=product&p=20214"},"modified":"2026-04-17T09:08:34","modified_gmt":"2026-04-17T09:08:34","slug":"une-en-iso-69422023","status":"publish","type":"product","link":"https:\/\/lenard.tech\/en\/producto\/une-en-iso-69422023\/","title":{"rendered":"UNE-EN ISO 6942:2023"},"content":{"rendered":"

[vc_row][vc_column][vc_column_text woodmart_inline=”no” text_larger=”no”]PROTECTION AGAINST HEAT AND FIRE. TEST METHOD: EVALUATION OF MATERIALS AND ASSEMBLIES OF MATERIALS WHEN EXPOSED TO A RADIANT HEAT SOURCE. Equivalence with EN ISO 6942:2022 & ISO 6942:2022.<\/em>[\/vc_column_text][\/vc_column][\/vc_row][vc_row][vc_column][vc_tta_tabs][vc_tta_section title=”OBJECT” tab_id=”1686236123488-f326608a-f528″][vc_column_text woodmart_inline=”no” text_larger=”no”]PURPOSE<\/strong><\/p>\n

Radiant heat protective clothing is worn in different circumstances and because of this, the intensity of radiation that falls on the material of the clothing can vary over a wide range.<\/p>\n

Industrial workers or firefighters may be exposed to relatively low-intensity radiation over a long period of time. Industrial workers or firefighters may be exposed to medium-intensity radiation for short periods of time, or to high-intensity radiation for very short periods.<\/p>\n

This regulation specifies two complementary test methods: Method A is used for the visual assessment of changes in the material after the action of heat radiation. Method B determines the protective effect of the materials. Materials can be tested by both methods or by one method only.<\/p>\n

Since the tests are carried out at room temperature, the results are only suitable for predicting the performance of protective clothing.<\/p>\n

DEFINITIONS:<\/strong><\/p>\n

Heat Transfer Levels:<\/p>\n

Time t12: time in seconds, expressed to a decimal place, to obtain a calorimeter temperature increase of (12 \u00b1 0.1) \u00b0C when tested with method B<\/p>\n

Time t24: time in seconds, expressed as a decimal place, to obtain a calorimeter temperature increase of (24 \u00b1 0.2) \u00b0C when tested with method B<\/p>\n

Thermal Transmission Factor (TF): A measure of the fraction of heat transmitted through the sample exposed to a radiant heat source. It is numerically equal to the ratio between transmitted and incident heat flux densities.<\/p>\n

Radiant Heat Transfer Index (RHTI): A number calculated from the time measured in seconds with a decimal place, necessary to obtain a specified increase in the temperature of the calorimeter when tested with this method and at a specified incident heat flux density.[\/vc_column_text][\/vc_tta_section][vc_tta_section title=”MATERIALS AND EQUIPEMENT” tab_id=”1686236123496-e4013a9c-7029″][vc_column_text woodmart_inline=”no” text_larger=”no”]TEST EQUIPMENT:<\/p>\n

-For both methods the following are used:<\/p>\n

-Radiant heat source consists of SiC heating bars with an electrical resistance of 3.6 \u03a9 \u00b1 10% at 1070\u00baC.<\/p>\n

-Test frame<\/p>\n

-Sample Stand<\/p>\n

It is added for method B:<\/p>\n

-Calorimeter<\/p>\n

-Temperature Recording and Measurement Device<\/p>\n

SAMPLES<\/strong><\/p>\n

For tests performed by method A, one sample should be used, and for tests performed by method B, at least three samples should be used for each heat flow level. If the material to be tested is not very homogeneous, at least three samples should be tested by method A and five by method B.<\/p>\n

Samples should have dimensions of 230 mm X 80 mm. Composite samples should reproduce multi-layer clothing sets as they are used in practice. If the material supplier does not indicate the external surface, tests should be carried out on both sides.[\/vc_column_text][\/vc_tta_section][vc_tta_section title=”PROCEDURE AND RESULTS” tab_id=”1686236239562-82f8497e-52f7″][vc_column_text woodmart_inline=”no” text_larger=”no”]METHODS<\/strong><\/p>\n

TEST CONDITIONS:<\/strong><\/p>\n

-Condition the samples at least 24 h at 20 \u00b1 2 \u00baC and 65 \u00b1 4% RH. The trial should be started within 3 min after conditioning.<\/p>\n

-The tests will be carried out in a room free of air currents and protected from any parasitic radiation that could be recorded by the calorimeter. The temperature of the room between 15-35\u00baC and the calorimeter has to be cooled to room temperature \u00b1 2 \u00baC before each test.<\/p>\n

-Heat flux density:<\/p>\n