Firefighter chemical protective clothing is the protective clothing worn by firefighters in fire and accident scenes with hazardous chemicals and corrosive substances to protect themselves from chemical hazards or corrosive substances. When selecting, it is necessary to strictly follow the principles of "scene adaptation, standard compliance, performance matching, and practical feasibility", and accurately select based on key factors such as hazardous media, disaster types, and operation duration in the working environment. The following are detailed selection points.
1、 Core premise: Clearly define the homework scenario and lock in the protection level
The degree of danger in different chemical disaster scenarios varies greatly, and it is necessary to first identify the core risks of the work environment in order to determine the protection level of chemical protective clothing (heavy/light), in order to avoid insufficient or excessive protection affecting work efficiency.
-Heavy duty chemical protective clothing (fully sealed) is suitable for scenarios where there are toxic and harmful gases, volatile hazardous chemicals, highly corrosive liquids/gases, and it is necessary to enter the core area of the accident for operation. For example, chemical tank leaks, on-site disposal of toxic gas explosions, environments with strong corrosive substances such as acid and alkali splashes, and unknown hazardous chemical accident sites (requiring the highest level of protection). In such scenarios, chemical protective clothing needs to have fully sealed protection capabilities and be used in conjunction with positive pressure air respirators.
-Light chemical protective clothing (semi enclosed) is suitable for non splashing environments of solid or liquid chemical hazardous materials, low concentration corrosive substance operations, and warning and auxiliary operations around accidents. For example, cleaning up small amounts of acidic and alkaline solution leaks, small-scale pollution disposal in chemical laboratories, and personnel transportation around hazardous areas. Attention: Lightweight chemical protective clothing does not have anti-virus function and is strictly prohibited from being used in toxic gas environments.
2、 Key dimension: Verify compliance standards to ensure effective protection
The protective performance of chemical protective clothing must comply with national/industry standards, which is the core prerequisite for ensuring protective effectiveness. When purchasing, it is necessary to focus on verifying the product's certification qualifications and compliance with standards.
-Domestic core standards: Must comply with GA 770-2008 "Firefighter Chemical Protective Clothing" standard, among which heavy-duty chemical protective clothing must meet the "airtight" requirement and pass the positive pressure airtight test; Lightweight chemical protective clothing must meet the requirements of "liquid tightness" and have anti acid and alkali penetration properties. At the same time, attention should be paid to whether the product has passed the additional tests (such as flame retardancy and physical strength tests) of GB 24539-2009 "General Technical Requirements for Chemical Protective Clothing".
-International reference standards: If it involves imported products or international rescue missions, international authoritative standards can be referred to, such as NFPA 1991 (Air tight Chemical Protective Clothing Standard) in the United States, EN 943-1 (Class 1 Air tight Protective Clothing Standard) in Europe, and EN 943-2 (Class 2 Liquid tight Protective Clothing Standard). It is necessary to ensure that the certification scope of the product matches the hazardous media in the work environment (such as EN 943-1, which requires a clear labeling of the protected chemical substance list).
-Key points of qualification verification: Suppliers are required to provide original explosion-proof certificates, type inspection reports, factory inspection reports, etc. for their products, and verify that the product model, protection level, applicable medium, and other information in the report are consistent with the actual product; Check whether the standard number, manufacturer, production date, size and other information on the clothing nameplate are complete and clear.
3、 Performance matching: Focus on core protection indicators and adapt to actual needs
After clarifying the protection level and compliance standards, it is necessary to further verify the core performance indicators of the product to ensure that it can cope with specific risks in the operating environment.
-Anti chemical penetration performance: Select the type of chemical medium according to the working environment, and focus on checking the product's protection time against key media. For example, when dealing with strong acid accidents (such as sulfuric acid and nitric acid), it is necessary to choose products that do not penetrate within 60 minutes in 80% H ₂ SO ₄ and 60% HNO ∝; To handle strong alkali accidents (such as sodium hydroxide), it is necessary to meet the requirement of no permeation in 6.1mol/L NaOH for 60 minutes. For unknown media, it is preferable to choose broad-spectrum chemical protective clothing with a wider protection range.
-Physical and flame retardant properties: Clothing fabrics need to have sufficient physical strength to ensure that they are not easily damaged during operation - the tensile strength in the warp and weft directions should be ≥ 450N/5cm, the tear resistance strength should be ≥ 32N, and the recommended adhesive thickness is 0.45 ± 0.05mm (balancing protection and flexibility). At the same time, it is required to have flame retardant properties, with a flame burning time of ≤ 2s, a flameless burning time of ≤ 10s, a damage length of ≤ 10cm, and no melting or dripping phenomenon to avoid secondary injury in the fire scene.
-Airtightness and field of view performance: Heavy duty chemical protective clothing should focus on checking its airtightness, and pass a positive pressure airtightness test (generally requiring a pressure drop of ≤ 30Pa within 30 minutes at a pressure of 200Pa) to ensure that toxic gases cannot penetrate. The screen should be made of a wide and high transmittance material, and priority should be given to equipping it with multi-layer composite anti fog coating or electric anti fog system to avoid blurred vision and affect operations in high temperature and high humidity environments; The impact resistance performance of the screen should meet the standards and be able to withstand the impact of splashes.
4、 Practical adaptation: Balancing ergonomics and user convenience
The comfort and operational flexibility of chemical protective clothing directly affect work efficiency, and should be selected based on the firefighter's body shape and work needs.
-Size and ergonomic design: Choose products that cover multiple sizes to ensure that every firefighter can find suitable clothing (too tight affects movement, too loose can easily entangle obstacles). The clothing should adopt a pleated design that conforms to human joint activity (such as shoulders, elbows, and knees), and the matching gloves and boots should be seamlessly connected to the clothing (to avoid leakage from gaps), and the gloves should retain a certain degree of operational flexibility (such as the ability to grasp tools and operate equipment).
-Convenience of wearing and matching: Heavy chemical resistant clothing should be designed with convenient on and off structures (such as back zipper+Velcro seal, quick connector) for quick dressing in emergency situations; The supporting respirator interface and communication interface need to be reserved and well sealed, without affecting the protective performance, while ensuring smooth communication between firefighters and the outside world. Lightweight chemical protective clothing should choose a style that is easy to put on and take off, suitable for quick response auxiliary work scenarios.
-Weight and duration adaptation: The overall weight of heavy-duty chemical protective clothing generally does not exceed 5kg, to avoid increasing the physical exertion of firefighters due to excessive weight and affecting long-term operations; If the homework duration is long (such as more than 1 hour), it is necessary to choose fabrics with relatively good breathability (without affecting the protective performance) or use them in conjunction with a cooling system.
5、 Quality assurance: Focus on brand and after-sales, avoid purchasing risks
Firefighter chemical protective clothing belongs to special protective equipment, and quality stability and after-sales support are crucial. It is necessary to avoid low-priced and inferior products.
-Prioritize choosing professional brands: Choose brands with mature technology accumulation and good market reputation in the field of fire protection (such as Junke, Rexroth, DuPont, 3M, etc.). The products of such brands have undergone strict testing and verification, with more reliable quality and the ability to provide customized solutions for different scenarios. Avoid purchasing "three no" products or OEM products, as the protective performance of such products cannot be guaranteed.
-Emphasize after-sales and training services: Require suppliers to provide comprehensive after-sales services, including product warranty (generally recommended for 1-2 years), fault repair, fabric replacement, etc; At the same time, professional training on clothing, usage, and maintenance should be provided to ensure that firefighters master the correct dressing methods, airtightness inspection procedures, and daily maintenance skills (such as cleaning, drying, and storage requirements), and extend the service life of clothing.
-Verify product details: During purchase, inspect the seam process of the clothing on site (using hot vulcanization bonding or wireless seam pressing technology to avoid pinhole leakage), the integrity of the sealing ring (without damage or aging), and the smoothness and sealing of the zipper; For heavy-duty chemical protective clothing, a simple air tightness test can be conducted on-site (such as observing for air leakage after inflation) to ensure that the product has no quality defects.
6、 Summary of Selection: Precise Matching, Safety First
The core of choosing firefighting chemical protective clothing is "safety first, precise adaptation". Firstly, determine the choice of heavy or light chemical protective clothing based on the hazardous medium and type of operation in the work scenario; Secondly, verify whether the product meets national/industry standards and has complete certification qualifications; Matching requirements with detailed parameters such as chemical protection performance, physical properties, and ergonomic design; Finally, choose products with reliable brand and comprehensive after-sales service, and provide personnel training and daily maintenance. Avoid blindly pursuing low prices or excessive protection, ensure that protective equipment can withstand risks while ensuring operational efficiency, and truly safeguard the safety of firefighters' lives.