Testing standards and methods for flame retardant fabrics
There are many types of fire-proof fabrics. Some customers will ask whether the effect of Cotton fabrics after fire-proof treatment is good? I also asked about the durability of Cotton fire-resistant fabric. There are also many customers who are concerned about whether fire-resistant fabrics are harmful to the body if used as fire-resistant work clothes. The editor below will explain to you the detection of fire-resistant fabrics.
In order to prevent disease and harmful bacterial invasion, human sweat gland secretions are weakly acidic (PH value between 5.2-5.8). If the PH value of fabrics in direct contact with the skin is not properly controlled, it will directly affect the PH value of human skin, thereby affecting health. The PH value test of fire-resistant fabrics has always been one of the ecological fabric indicators that regulatory agencies in various countries focus on testing, and it is also an indicator that frequently fails to meet standards.
At present, most domestic manufacturers use a pH meter to measure the pH value of fabric product extracts in accordance with GB/T7573-2009 “Determination of pH value of water extraction of fabric products”. The main technical parameters specified in this standard are:
(1) Extraction medium Distilled water or deionized water, at least meeting the requirements of grade three water in GB/T6682-2008 “Specifications and Test Methods for Water Use in Analytical Laboratories”, with a pH value of 5.0-7.5; chlorine Potassium solution 0.1ml/L, prepared with distilled or deionized water.
(2) Extraction shaking method: reciprocating mechanical oscillator, with a rate of at least 60 times/min; rotary mechanical oscillator, with a rotation rate of at least 30 cycles/min.
(3) Temperature Room temperature, generally controlled at 10-30℃.
(4) Shaking time (120±5) min. If the laboratory can determine that there is no significant difference in the test results of 1 hour of shaking, 1 hour of shaking can be used for measurement.
Fire protection testing is basically carried out in accordance with two sets of testing standards, American and European. The European fire protection standards are EN
ISO 11611:2007, EN
ISO 11612:2008, EN
ISO 14116:2008/AC:2009 and EN469:2006.
The test method includes two test methods: surface burning and bottom burning. EN
ISO11611 divides fire safety levels into Class 1 and Class 2. The technical indicators of the two levels are the same, and the materials must meet the above requirements for surface and bottom combustion.
EN ISO 11612 Protective clothing for workers operating in high temperature environments and EN
ISO 14116: 2008 Protective clothing – Thermal insulation and fire protection – Materials, components and work clothing to limit the spread of flames.
The main American fire protection standards are NPFA
1971 and NFPA 2112.
NPFA 1971 Standard for testing of complete outfits for fire and similar fire protection purposes, NFPA
The test methods for work clothes fabrics in the 2112 Industrial Fire Protection Clothing Standard adopt the vertical burning method specified in the ASTM D6413-2008 standard.
Other tests on fire-resistant fabrics adopt the mandatory requirements of GB18401-2010: PH value, dyeing fastness, and decomposable aromatic amines. Different materials have different shrinkage rates, and the acceptance range is also inconsistent. Generally speaking, it is acceptable if the shrinkage of woven fabrics does not exceed 3% in the warp and weft directions, and that of knitted fabrics does not exceed 5%.
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