Masks/Gas Masks/Protective Clothing

I. Customer Pain Points

Protective equipment manufacturers (producing masks, gas masks, and protective clothing) face three fundamental challenges in the production of filtration materials, adsorption layers, and fabric composites: low filtration efficiency, high respiratory resistance, and residual harmful substances, all of which directly compromise protective efficacy and compliance standards.

Low filtration efficiency and inadequate protection

Ordinary masks use melt-blown fabric (with a filtration efficiency of <95%, targeting 0.3 μm particles), while gas masks employ ordinary activated carbon (with a specific surface area of 500–800 m²/g). The adsorption capacity for organic vapors (such as benzene, with a molecular diameter of approximately 0.6 nm) is only 50–100 mg/g, resulting in a mask filtration efficiency of <90% (below the requirement of China GB 2626-2019 "KN95 ≥ 95%") and a protection duration of <30 minutes for gas masks (below the U.S. NIOSH 42 CFR Part 84 requirement of "protection duration ≥ 60 minutes"). A mask manufacturer collaborating with Shanxi Xinhua Carbon Technology was forced to recall 100,000 masks due to low filtration efficiency, incurring losses exceeding 500,000 yuan.

High respiratory resistance and poor wearing comfort

The traditional composite filter material combining activated carbon and melt-blown fabric exhibits a gas flow resistance exceeding 100 Pa (while GB 2626-2019 requires ≤80 Pa), causing breathing difficulties for users (with an discomfort incidence rate>30%). A gas mask manufacturer partnered with Shanxi Xinhua Carbon Technology was suspended from procurement by two companies due to these resistance issues.

Residual hazardous substances with high safety risks

The protective clothing fabric uses organic solvents (such as DMF, at concentrations of 500–2000 mg/L) to bond an activated carbon layer. Traditional "hot air drying" methods cannot remove residual contaminants, and the material must comply with EU EN 14126 requirements for "chemical permeation ≤ 1.0 μg/cm²·h" and China GB 19082-2009 standards for "microbial barrier ≥ 99%." A protective clothing manufacturer collaborating with Shanxi Xinhua Carbon Technology once returned 50,000 garments due to DMF residue (1.5 μg/cm²·h), resulting in losses exceeding 1 million yuan.

II. Application Objectives

The four core objectives for protective equipment manufacturers using activated carbon align closely with "filtration efficiency, respiratory resistance, removal of harmful substances, and compliance":

Enhance filtration efficiency and ensure compliance with protective standards

Using nanofiber-reinforced activated carbon (specific surface area: 1500–2000 m²/g; fiber diameter: 50–100 nm), the filtration efficiency for 0.3 μm particles reaches ≥99.5% (compliant with GB 2626-2019 KN95); the adsorption capacity for organic vapors (benzene ≈0.6 nm) ranges from 300 to 500 mg/g; and the protective duration of gas masks is ≥90 minutes (compliant with NIOSH 42 CFR Part 84). After implementation at a mask manufacturer partnered with Shanxi Xinhua Carbon Technology, the mask recall rate dropped from 12% to zero.

Reduce respiratory resistance and enhance comfort

Using gradient-porous activated carbon (with 30% macropores>50 nm and 50% mesopores 2–50 nm), the airflow resistance was reduced to <50 Pa (exceeding GB 2626-2019 standards), with an discomfort rate of wearing incidence below 5%. After implementation at a gas mask manufacturer collaborating with Shanxi Xinhua Carbon Technology, procurement volume increased from 5,000 sets/month to 15,000 sets/month.

Remove harmful substances to ensure safety

Hydrophobic activated carbon (loaded with hydrophobic groups) was employed to adsorb DMF and acetone from protective clothing fabrics, achieving a removal rate exceeding 99% (residue <0.1 μg/cm²·h), fully complying with EN 14126 and GB 19082-2009 standards. When implemented by a protective clothing manufacturer partnered with Shanxi Xinhua Carbon Technology, the return rate dropped from 15% to zero.

Strict compliance enables breakthroughs in the international market.

Complies with global protective equipment standards:

China GB 2626-2019: KN95 filtration efficiency ≥95%, respiratory resistance ≤80 Pa;

US NIOSH 42 CFR Part 84: Protection duration ≥60 minutes (for organic vapors);

EU EN 149:2001+A1:2009: FFP2 filter efficiency ≥94%, respiratory resistance ≤70 Pa.

III. Application Significance

The application of activated carbon in protective equipment serves as the core foundation for enterprises to achieve a balance between protective efficacy, comfort, and international compliance standards.

Protective efficacy: Globally, 35% of protective product recalls are attributed to "low filtration efficiency." Activated carbon is one of the few technologies capable of simultaneously enhancing both particulate filtration and gas adsorption, thereby directly preventing "protective failure" (for example, a mask manufacturer collaborating with Shanxi Xinhua Carbon Technology saved ¥500,000 annually after using its products).

Enhanced comfort: Respiratory resistance has been reduced from>100 Pa to <50 Pa, while the incidence of wearing discomfort dropped from 30% to <5%. After implementation at an anti-gas mask manufacturer partnered with Shanxi Xinhua Carbon Technology, user repurchase rates increased by 20%.

International compliance: The EU's EN standards and the U.S. NIOSH regulations impose stringent requirements for protective equipment, with activated carbon technology being the only cost-effective solution that meets these standards. Following implementation by a company, exports of masks to the EU surged from 50,000 units per month to 200,000 units per month.

IV. Application History

The application of activated carbon in protective equipment has evolved alongside the ongoing advancement of protection standards and growing demands for comfort.

1970s: Initial Stage

The U.S.-based 3M Company pioneered the use of granular activated carbon (with a specific surface area of 800 m²/g) to manufacture a gas filtration chamber for gas masks. By employing an "adsorption-filteration" mechanism, it extended the protection duration against benzene exposure to 60 minutes, making it the world's first commercially available activated carbon-based gas mask product.

2020s: The Intelligent Phase

China's "14th Five-Year Plan for Emergency Equipment Development" requires that "the filtration efficiency of protective equipment be ≥99%." By integrating activated carbon with an "online filtration efficiency monitoring + automatic compounding" system, precise quality control can be achieved (e.g., automatically adjusting the number of compounding layers based on the specific surface area of activated carbon), reducing production errors by 20%.

V. Mechanism of Action

Through the triple mechanism of "high specific surface area filtration + gradient pore resistance reduction + hydrophobic adsorption," activated carbon addresses the issues of low filtration efficiency, high respiratory resistance, and residual harmful substances in protective equipment.

1. High specific surface area filtration: "dual interception" of pore structure

Microholes (<2 nm): Accounting for 60% of the total pore volume (specifically designed for gas molecules), they adsorb organic vapors (benzene ≈ 0.6 nm, acetone ≈ 0.5 nm) via van der Waals forces, with an adsorption capacity of 300–500 mg/g—three times that of conventional activated carbon.

Nanofibers (50–100 nm): Serving as a "particle interception layer," they achieve a filtration efficiency of ≥99.5% for particles as small as 0.3 μm (via electrostatic adsorption combined with mechanical interception).

Macropores (>50 nm): Serving as airflow channels, the gradient pore design (with macropores accounting for 30%) reduces airflow resistance to <50 Pa.

2. Gradient pore resistance reduction: "airflow optimization" of pore distribution

The macropores (>50 nm) of activated carbon account for 30% and serve as the primary gas flow pathway, while the mesopores (2–50 nm) constitute 50% as the gas adsorption channel, thereby reducing flow resistance with a breathing resistance below 50 Pa (compared to 100 Pa in conventional processes).

3. Hydrophobic adsorption: Removal of "harmful substances" by surface functional groups

The hydrophobic groups (e.g., methyl group-CH₃) loaded on the activated carbon surface adsorb DMF (a hydrophobic solvent) via hydrophobic interactions, achieving a removal efficiency>99% (residue <0.1 μg/cm²·h) and preventing chemical penetration into protective clothing.

VI. Application Methods

Protective equipment manufacturers employ a combined process of "nano-fiber activated carbon composite filter material + gradient pore design + hydrophobic modification," covering all application scenarios including masks, gas masks, and protective clothing.

1. Mask filter material: Nano-fiber activated carbon composite

Application scenario: KN95/KN100 masks (requiring filtration efficiency ≥95% and respiratory resistance ≤80 Pa).

process sequence ：

Nanofiber preparation: polyacrylonitrile (PAN) → electrospinning (voltage 15 kV, collection distance 15 cm) → nanofiber membrane (diameter 50–100 nm).

Activated carbon composite: nanofiber membrane + medical-grade activated carbon particles (0.1–0.3 mm, specific surface area 1500 m²/g) → hot-pressing compounding (120°C, 0.5 MPa) → filtration efficiency ≥99.5% and respiratory resistance <50 Pa.

2. Gas mask filter cartridge: Gradient-porous activated carbon

Application scenario: Organic vapor protection (required protection duration ≥ 60 minutes, respiratory resistance ≤ 70 Pa).

process sequence ：

Filter tank housing → Filled with gradient-porous activated carbon (30% macropores>50 nm, 50% mesopores 2–50 nm; specific surface area: 1800 m²/g) → Both ends sealed with filter screens (100 μm) → Protection duration ≥ 90 minutes; breathing resistance <55 Pa.

3. Protective suit fabric: Hydrophobic activated carbon composite

Application scenario: Chemical protection (requires DMF residue <0.1 μg/cm²·h and microbial barrier efficacy ≥ 99%).

process sequence ：

Non-woven fabric → Coated with hydrophobic activated carbon slurry (containing methyl groups, specific surface area: 1500 m²/g) → Dried at 80°C for 2 hours → DMF removal rate>99% (residue <0.08 μg/cm²·h); microbial barrier efficacy ≥99.5%.

VII. Application Process

Taking a mask manufacturer partnered with Shanxi Xinhua Carbon Technology Co., Ltd. (with an annual production capacity of 100 million KN95 masks, requiring filtration efficiency ≥99% and respiratory resistance <50 Pa) as an example:

Nanofiber preparation: PAN solution (10 wt%) → electrospinning (15 kV, 15 cm) → nanofiber membrane (diameter 80 nm, area 100 m²).

Activated carbon composite: nanofiber membrane + medical-grade activated carbon particles (0.2 mm, specific surface area 1600 m²/g) → hot-pressing compounding (120°C, 0.5 MPa pressure) → resulting composite filter material (thickness 0.5 mm).

Mask fabrication process: Composite filter material → Cutting (17.5 cm × 9.5 cm) → Ultrasonic welding (for ear loop and nose clip) → Respiratory resistance testing (<48 Pa) and filtration efficiency testing (99.6%) → Packaging.

Regeneration and Reuse:

Waste masks → High-temperature incineration (850°C, under N₂ protection) → Activated carbon recovery (regeneration rate 75%), at a cost of only 45% that of new carbon.

VIII. Application Effects

Following renovation, a mask manufacturing plant achieved significant improvements in key performance indicators (based on actual operational data from Shanxi Xinhua Carbon Technology's partner clients):

metric	Before modification (ordinary melt-blown fabric)	After modification (nanofiber + activated carbon composite)	Amplitude Increase	Compliance Status
filter efficiency （%）	92	99.6	Increased by 8.7%	GB 2626-2019 KN95
respiratory resistance （Pa）	110	48	Decreased by 56.4%	GB 2626-2019
Discomfort incidence (%):	32	4	Decreased by 87.5%	—
recall （%）	12	0	Reduce by 100%	—
Monthly Production (Ten Thousand Units)	50	120	Increase by 140%	—

IX. Core Advantages

Our customized solutions for protective equipment manufacturers offer four unique and irreplaceable advantages:

The product is highly targeted and meets specific protection requirements.

The developed nanofiber composite activated carbon (specific surface area: 1500–2000 m²/g; fiber diameter: 50–100 nm) is specifically designed to enhance filtration efficiency, achieving a particle filtration rate of ≥99.5%. The gradient-pore activated carbon (30% macropores and 50% mesopores) exhibits a breathing resistance of <50 Pa. After application at a mask manufacturer collaborating with Shanxi Xinhua Carbon Technology, the filtration efficiency improved from 92% to 99.6%.

Exhibits excellent comfort and reduces discomfort.

The gradient pore design achieves a respiratory resistance of <50 Pa (exceeding the requirements of GB 2626-2019) and an discomfort rate of <5% (compared to 32% with traditional methods). After implementation by a gas mask manufacturer collaborating with Shanxi Xinhua Carbon Technology, procurement volumes surged from 5,000 sets per month to 15,000 sets per month.

Compliant and reliable, with comprehensive coverage of all required qualifications.

The product has obtained certifications under GB 2626-2019 (for masks), NIOSH 42 CFR Part 84 (for gas masks), and EU EN 149:2001+A1:2009 (for respiratory protection), fully complying with global standards for protective equipment.

Cost-controlled with high cost-effectiveness throughout the entire lifecycle.

Nanofiber activated carbon composite filter media: operating cost of 0.1–0.2 yuan per unit (half that of traditional methods), with an initial investment of only 2–3 million yuan per 100 million units at annual production capacity.

Gradient-porous activated carbon: Can be regenerated three times (with regeneration costs equivalent to 45% of new carbon cost). A mask manufacturer collaborating with Shanxi Xinhua Carbon Technology has achieved a 50% reduction in annual production costs (from RMB 1 million to RMB 500,000).

X. Cost Analysis

Taking the annual production of 100 million KN95 masks as an example, compare the cost differences between the activated carbon process and traditional methods:

project	Nanofiber + Activated Carbon Composite Process	Standard melt-blown fabric production process
Initial Investment (Ten Thousand Yuan)	250-350	150-250
Operating Cost (RMB per unit)	0.15-0.25	0.3-0.4
Maintenance Cost (RMB 10,000/year)	30-50	80-120
Total Life Cycle Cost (RMB per unit)	0.3-0.5	0.6-0.8
Recall Loss (ten thousand yuan/year)	0	50

XI. Why Choose Us?

Performance endorsement: Activated carbon's "high filtration efficiency and low respiratory resistance" has received unanimous acclaim—when a mask manufacturer, a partner of Shanxi Xinhua Carbon Technology, adopted our nanofiber-plus-activated carbon composite filter material, filtration efficiency surged from 92% to 99.6%, while the recall rate dropped from 12% to zero.

Technical Strength: The pore structure has been optimized to meet the demands of protective equipment, resulting in the development of "nanofiber composite carbon with a specific surface area of 1600 m²/g" and "gradient-pore activated carbon (30% macropores, 50% mesopores)" that exhibit a respiratory resistance of <50 Pa, effectively addressing the limitation of high respiratory resistance associated with traditional manufacturing processes.

Global Services: With production bases in Shanxi, Ningxia, and Fujian (with an annual capacity of 45,000 tons), we support "customized production + localized distribution." For overseas clients, we provide end-to-end services covering activated carbon selection, filter material design, and compliance certification (NIOSH/EN), ensuring prompt response within 72 hours.