Aramid Knitted Fabric, Modacrylic Knitted Fabric, Modacrylic Aramid Nylon Knitted Fabric, Technical Textile Knitted Fabric Sales

Aramid Knitted Fabric, Modacrylic Knitted Fabric, Modacrylic Aramid Nylon Knitted Fabric, Technical Textile Knitted Fabric Sales

Technical Breakdown of Flame-Resistant Knitted Fabrics

1. Knit Fire-Blocker Family

Composition: 93% Meta-aramid, 5% Para-aramid, 2% Antistatic fiber

• Meta-aramid (93%): Limiting Oxygen Index (LOI) ≈ 28-30. Continuous service temperature: 200-220°C. Does not melt; carbonizes above 400°C. Provides inherent flame resistance, low thermal conductivity, and high flexibility.

• Para-aramid (5%): LOI ≈ 29. Tensile strength 3.0-3.6 GPa, elongation at break 2.4-3.6%. Retains strength above 500°C. Thermal shrinkage <1% (300°C, 15 min). In the blend, it acts as a structural skeleton, enhancing tear and puncture resistance.

• Antistatic fiber (2%): Conductive carbon or stainless-steel filament yielding surface resistance 10⁵–10⁹ Ω. Required for compliance with EN 1149-1/3 (electrostatic discharge protection).

Knitting & Weight Variants:

Standards: Designed for the top tiers of EN ISO 11612 (flame spread, convective/radiant heat) and EN 61482-2 (arc flash protection). The 5% para-aramid prevents severe strength loss after brushing (fleece finishing). Homogeneous antistatic fiber distribution maintains EN 1149-3 compliance after 25+ industrial washes.

2. Knit Body-Guard Family

Composition: 55% Viscose FR, 44% Meta-aramid, 1% Antistatic fiber

• Viscose FR (55%): LOI 27-28. Phosphorus-based additives provide permanent flame retardancy. Thermal decomposition releases water and forms a char barrier. Moisture regain 11-13%, regulating skin microclimate. Tenacity lower than meta-aramid (~2.0-2.5 cN/dtex); wet strength loss ~30%.

• Meta-aramid (44%): Ensures non-melting behavior and reinforces the char skeleton.

• Antistatic (1%): Sufficient for basic static dissipation; 2% is preferred for high-risk ATEX zones.

Knitting & Weight Variants:

Applicable Standards: EN ISO 11612 (limited flame spread, convective/radiant heat), EN 1149 (antistatic). Not classified for molten metal splash in EN 11611 (welding protection), hence not recommended for heavy welding.

3. Knit Para-Vis Family

Composition Strategy: 78% Viscose FR, 20% Para-aramid, 2% Antistatic fiber

• Viscose FR (78%): High comfort, lower cost, but higher thermal shrinkage tendency (>5% at 200°C).

• Para-aramid (20%): Tenacity 10x higher than viscose (20-25 cN/dtex). Near-zero thermal shrinkage (0.1% at 250°C). The blend leverages para-aramid as a rigid skeleton that physically constrains viscose FR shrinkage at elevated temperatures.

• Antistatic (2%): Full protection level.

Weight Variants:

Critical Testing: EN ISO 9185 (molten metal splash resistance) and EN 11611 Class 2 welding compatibility. Fabrics without para-aramid (e.g., 100% FR viscose or modacrylic blends) commonly fail these tests due to hole formation and metal adhesion. Para-Vis resolves this deficiency.

4. Knit Opti-Syn 220

Multi-Blend Analysis:

• Aramid (33%, meta-aramid): Thermal skeleton, non-melting.

• Modacrylic (32%): LOI 32-34, high self-extinguishing capacity. Thermal shrinkage >3% above 150°C.

• Tencel® (Lyocell, 23%): Fibrillation-controlled, high moisture desorption; enhances heat loss through absorption. Improves skin sensorial comfort.

• Polyamide 6.6 (10%): Melting point ~255°C. In flame tests (ISO 15025), localized melting occurs but is trapped within the aramid framework, preventing dripping. Provides abrasion resistance (Martindale >50,000 cycles).

• Antistatic (2%): Standard.

Plated Knit Architecture (Face: Pique, Back: Single Jersey):

• Technical Advantage: Plating allows differential fiber distribution – aramid/modacrylic on the outer face for flame/thermal barrier, Tencel/polyamide on the inner face for moisture management and abrasion durability.

• Arc Flash Protection (EN 61482-2): ATPV or EBT value typically >8 cal/cm². The multi-fiber blend creates layered thermal insulation against arc plasma through different decomposition temperatures.

• Thermo-Physiological Comfort: Tencel provides high water vapor permeability (Ret target <10 m²·Pa/W), reducing heat stress.

5. Knit MACO-S Family

Fiber Technology:

• Modacrylic (60%): LOI 32-34, contains flame-retardant comonomer (e.g., vinylidene chloride or antimony oxide). Low density (1.37 g/cm³), high bulk.

• Cotton (38%): Natural hydrophilicity (8.5% moisture regain). Forms insulating char upon combustion. Synergy: cotton chars while modacrylic maintains the carbonized skeleton.

• Thermal Limitation: Modacrylic shrinkage begins above 150°C. Cotton mitigates the visual effect, but total shrinkage can exceed 5% at 200°C. This family may not meet the stricter heat shrinkage criteria of EN ISO 11612; it is primarily used in conjunction with EN 1149 and EN 13034 (limited chemical protection).

Knitting Variants & Suitability:

Additional Technical Variants Not Present in the Table

1. 100% Para-aramid Knit (Cut/Puncture Protection)

   • Weight: 200–340 g/m², tight interlock or double jersey.

   • Performance: EN 388 cut resistance Level 3–5; EN 407 contact heat resistance 500°C >10 s. Zero shrinkage under heat, full structural integrity. Used for foundry gloves, glass handling.

2. Oxidized PAN (O-PAN) Blend Knits

   • Composition: 60% oxidized polyacrylonitrile, 40% FR viscose or aramid.

   • LOI: 45-55. Minimal smoke and toxic gas emission even at 1000°C in oxidizing atmosphere. Designed for aluminum smelter apron linings and blast furnace proximity.

   • Limitation: Low flex fatigue resistance; fiber becomes brittle under continuous dynamic load.

3. Aluminized Laminated Aramid Knits (Radiant Heat Reflector)

   • Structure: 100% meta-aramid single jersey (120-150 g/m²) + aluminum vapor-coated PET film lamination.

   • Reflectance: 90-95% in the IR spectrum (0.8-10 µm).

   • Application: Thermal liner behind moisture barrier in firefighter turnout gear, inner layer of furnace gloves. Can raise EN ISO 11612 radiant heat (Class C) performance to C4.

4. FR Wool/Para-aramid Blends (Molten Metal Optimized)

   • Composition: 70% Zirpro-treated wool (permanent FR), 25% para-aramid, 5% polyamide.

   • Mechanism: Wool’s high LOI (25-26) and curling/singe behavior dissipate the kinetic energy of molten metal droplets, preventing adhesion. Para-aramid provides tear resistance. Primary choice for EN 11611 Class 2 molten iron splash.

5. Phase Change Material (PCM) Integrated FR Knits

   • Technology: Microencapsulated paraffin embedded in FR viscose or acrylic fibers.

   • Thermoregulation: Absorbs/releases latent heat around 28-32°C.

   • Application: Military, special operations firefighting gear to manage heat stress under high metabolic workloads.

Sector-Specific Performance Requirements Matrix