Question 41 (Textile Engineering & Fibre Science)
Determine the correctness or otherwise of the following assertion [a] and reason [r]
[a] Phosphorus and nitrogen based agents act as vapour phase flame retardant for cotton.
[r] phosphorus yields phosphoric acid and hinders formation of levoglucosan while nitrogen has a synergistic effect.
| (A) | [a] is right and [r] is wrong |
| (B) | [a] is wrong and [r] is right |
| (C) | Both [a] and [r] are right |
| (D) | Both [a] and [r] are wrong |
[Show Answer]
C
Frequently Asked Questions | FAQs
What is gas phase mechanism flame retardant?
Gas phase mechanism flame retardants are a type of flame retardant used in textiles to reduce the flammability and increase the safety of the fabrics. Unlike other types of flame retardants that work by forming a protective barrier or extinguishing the flame, gas phase mechanism flame retardants work by interrupting the combustion process at the gas phase.
The gas phase mechanism flame retardants operate by releasing inert or reactive gases, such as water vapor, carbon dioxide, ammonia, or phosphorous compounds, when exposed to high temperatures. These gases act to dilute the oxygen concentration in the combustion zone, disrupt the radical chain reactions that sustain the flame, and promote the formation of non-combustible products.
The effectiveness of gas phase mechanism flame retardants depends on several factors, such as the chemical structure and concentration of the flame retardant, the type and composition of the fabric, the exposure conditions, and the combustion mechanism. In general, gas phase mechanism flame retardants are more effective for reducing the peak heat release rate and smoke production of fabrics than for preventing the ignition or extinguishing the flame.
Gas phase mechanism flame retardants can be applied to textiles by various methods, such as impregnation, coating, spraying, or incorporation into the polymer matrix. They can be used alone or in combination with other types of flame retardants to achieve optimal flame retardancy performance.
Overall, gas phase mechanism flame retardants are a promising approach to enhance the fire safety of textiles, particularly in applications where high-performance flame retardancy is required, such as in public transportation, aerospace, and military applications.