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Introduce our products
Premium nonwoven strobel insole board (1.2 mm – 2.5 mm). High tensile strength, extreme flexibility, SATRA certified. Ideal for athletic & casual shoes. Free samples!
Nonwoven strobel insole board is a specialized, lightweight structural material engineered for strobel‑stitched footwear construction, particularly in athletic sneakers, casual running shoes, and lightweight flexible boots. Manufactured by stitch‑bonding or needle‑punching continuous synthetic fibers (polyester PET and polypropylene) combined with a flexible resin binder, this substrate replaces traditional rigid lasting boards. It allows the shoe upper to be stitched directly to the perimeter of the insole board, creating a flexible "sock" or "bag" prior to unit sole attachment. Astreism produces this material in continuous roll stock (1.0 m – 1.5 m usable width) or pre‑cut sheets with uniform gauge tolerances (± 0.04 mm) to support high‑speed automated strobel stitching and CNC die‑cutting equipment.
Technical Specifications Matrix
| Engineering Property | Physical / Chemical Specification Benchmark | Test Standard Reference |
|---|---|---|
| Material Base Composition | High‑Tenacity Needle‑Punched PET/PP Synthetic Fiber Matrix | ISO 9073‑1 |
| Thickness Selection | 1.20 mm – 2.50 mm (± 0.04 mm) | ISO 9073‑2 |
| Areal Weight (Grammage) | 250 g/m² – 600 g/m² | ISO 9073‑3 |
| Tensile Strength (Warp/Weft) | ≥ 450 N / 5cm / ≥ 400 N / 5cm | ISO 9073‑3 |
| Stitch‑Tear Strength | ≥ 60 N (Prevents needle perforations from pulling out under tension) | SATRA TM82 / ISO 4674‑1 |
| Bally Flex Resistance | ≥ 150,000 Cycles (Zero surface cracking or matrix breakdown) | SATRA TM3 / ISO 5402‑1 |
| Water Absorption Rate | ≤ 20.0% (Fast moisture absorption and rapid desorption) | SATRA TM134 / ISO 20344 |
| Dimensional Stability | Shrinkage ≤ 1.0% after thermal cementing (100°C exposure) | SATRA TM177 |
| Environmental Safety | REACH SVHC compliant, Formaldehyde‑Free (≤ 20 ppm), Heavy‑Metal‑Free | ISO 17025 / SATRA Guidelines |
Manufacturing Process & Fiber Matrix Bonding
Achieving optimal stitch retention while maintaining footbed flexibility requires precision fiber carding, needle-punching, and thermal binder consolidation:
Manufacturing Process Flow:
PET/PP Synthetic Fiber Blending
Multi‑Layer Needle‑Punching Web
Thermal Calendering & Binder Impregnation
Precision Gauge Roll Slitting
Stitch‑Tear & Flex Fatigue Testing QC
SATRA Quality Compliance
Synthetic fibers are carded and cross-lapped into a uniform web. Multi-bar needle-punching heads entangle the fibers, creating a dense 3D interlocking matrix. The web then passes through heated calendering rollers where a specialized elastomeric binder is cured, locking the fibers in place to ensure clean needle punches without snagging threads during strobel stitching.
Industrial Application Scenarios
Astreism nonwoven strobel insole boards are specified across high-volume athletic and casual footwear assembly lines:
Athletic & Performance Running Shoes
Primary strobel board providing maximum forefoot flex, low added weight, and high torsional agility.
Casual Sneakers & Comfort Footwear
Flexible footbed base for vulcanized shoes, slip-ons, and lifestyle sneakers requiring step-in softness.
Lightweight Safety & Occupational Shoes
Needle-punched Strobel insoles configured with antistatic or conductive fibers for ESD-compliant safety footwear.
FAQ
Q1: What is the advantage of a nonwoven strobel insole board over traditional paper/cellulose lasting boards?
A1: Strobel insole boards are dramatically more flexible, lightweight, and durable than rigid paper cellulose boards. They do not stiffen or break down under dynamic foot flexing, nor do they disintegrate if exposed to sweat or moisture inside the footwear cavity.
Q2: Can this strobel material be needle-punched with antistatic threads for safety shoes?
A2: Yes. We manufacture specialized conductive and antistatic variants infused with carbon‑treated fibers. These meet global safety footwear standards (≤ 10⁸ Ω electrical resistance under ISO 20344).
Q3: What is the lead time for standard roll stock and sample orders?
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why choose us
why choose our products
We specialize in providing premium-grade materials for industrial applications. Our focus on wholesale sourcing ensures you receive competitive pricing on large orders, alongside flexible fabric customization to meet your exact specifications. Whether you need high-volume production runs or specialized orders, we ensure your success with fast delivery and exceptional support.
- Bulk Sourcing: Competitive pricing for large-scale orders.
- Customization: Flexible solutions tailored to your industry needs.
- Global Shipping: Fast, reliable delivery to international markets.
- High-Quality Standards: Rigorous testing and quality assurance to ensure performance and durability.
Elite Partners
Direct collaboration with DHL, FedEx, UPS, TNT, and EMS to ensure maximum shipping efficiency.
Custom Logistics
Flexible options covering air freight, sea cargo, and express door-to-door delivery.
Secure Transit
Professional packaging and full-course tracking for peace of mind.
Our Advantage
Sourced for Excellence: We meticulously select only premium-grade raw materials.
Expert Craftsmanship: Our team comprises experienced technicians operating advanced machinery.
Proactive QC: We implement rigorous in-line inspections throughout every stage of production.
Zero-Risk Standards: A dedicated QC team performs final double-inspections, fully compliant with your chosen AQL standards before packaging.
Unwavering Consistency: We maintain a strict, non-negotiable commitment to top-tier quality.
fAQ
A1: Approximately 25-35 days after all specifications and order details are confirmed.
A2: We typically require a 30% deposit in advance with the remaining 70% balance due before shipment. Alternatively, we accept a 50/50 split depending on the final order quantity.
A3: We accept T/T (Telegraphic Transfer), PayPal, and Western Union.
A4: Free samples are available! Custom sample preparation takes about 3-5 days once all details are confirmed
ASTERISM Import And Export Co., Ltd.
Let's build a profitable future together. We sincerely welcome global clients for long-term strategic cooperation. Contact us today-our team is ready to respond to your inquiries swiftly.
ace01@eurus-cn.com +8613459576329
Whatsapp+8613459576329 
