Sew Magnet

Overview

Product Specifications

· Magnet Core: Shape: Disc, square, or strip; Dimensions: Diameter/length 5-20 mm, thickness 1-5 mm; Material: Sintered NdFeB (isotropic/anisotropic); Magnetization direction: Axial (through thickness) or in-plane.

· Casing: Material: Polyester blend fabric, silicone, TPU, or heat-shrinkable plastic; Thickness: 0.3-1.5 mm; Color: Black, white, or custom dyeable options; Wash resistance: Up to 60°C (standard) or 95°C (industrial grade).

· Performance: Holding force: 0.2-2 kg per pair; Operating temperature: -30°C to 80°C (fabric casing) or -40°C to 120°C (silicone casing); Magnetic flux density at surface: 100-300 mT.

· Mechanical Features: Sewing holes (2-4 per magnet, diameter 1-2 mm); Flexibility: ≥90° bending without casing cracking; Adhesive backing option (acrylic or silicone-based for non-sewing applications).

Product Grades

Classified by magnetic strength, casing durability, and application suitability:

· Standard Grade (N30-N35): (BH)max 30-35 MGOe, holding force 0.2-1 kg per pair, fabric or basic plastic casing; suitable for light-duty applications (children's clothing, crafts).

· High-Force Grade (N40-N45): (BH)max 40-45 MGOe, holding force 1-2 kg per pair, reinforced casing (nylon or silicone); used for heavy fabrics (denim, outerwear) or industrial textiles.

· Medical/Child-Safe Grade: Encapsulated in hypoallergenic silicone or organic cotton, no small parts, passed skin irritation tests (ISO 10993); compliant with CPSC children's product safety standards.

· Washable Grade: Heat-sealed TPU casing, machine washable (50+ cycles at 60°C), resistant to detergent and fabric softener chemicals.

Coatings

The NdFeB core is pre-coated before casing to prevent corrosion, with common options:

· Nickel-Copper-Nickel Plating: Standard core coating (5-10 μm thickness), provides basic corrosion resistance; compatible with all casing types.

· Zinc Plating: Economical core coating (3-5 μm), used for indoor-only applications with fabric casing.

· Epoxy Coating: Thick (10-20 μm) protective layer, chemical resistance for silicone-cased magnets in industrial environments.

· Parylene Coating: Ultra-thin (1-3 μm) conformal coating, biocompatible for medical textile applications (e.g., compression garments).

Application Scope

· Apparel & Fashion: Magnetic closures for jackets, coats, dresses, and accessories (handbags, hats); hidden fasteners for seamless garment designs; adjustable fit components (waistbands, cuffs).

· Home Textiles: Curtain tiebacks, cushion covers, bed linens, and decorative fabric panels; reusable sewing fasteners for quilting and craft projects.

· Medical Textiles: Compression garments, orthopedic braces, and adaptive clothing for elderly/disabled users; easy-on/off closures for patients with limited mobility.

· Outdoor Gear: Tent flaps, backpacks, and outdoor clothing (waterproof variants with sealed silicone casing); quick-release fasteners for sports equipment.

· Children's Products: Reversible clothing, educational toys, and safety bibs (child-safe, no small detachable parts).

Packaging Information

· Consumer Packaging: Blister cards or resealable plastic bags (5-20 pairs per pack), labeled with size, holding force, washing instructions, and safety warnings; includes sewing guidelines.

· Bulk Packaging: Cardboard boxes with dividers (100-500 pairs), each magnet pair separated by tissue paper to prevent sticking; moisture-resistant packaging with desiccants.

· Industrial Packaging: Vacuum-sealed bags (1000+ pairs) on pallets, with casing material certification (OEKO-TEX, REACH compliance) and batch test reports.

· Safety Packaging: Child-resistant packaging for small-sized magnets (≤10mm diameter); mandatory warnings: "Keep away from pacemakers" and "Not for children under 3 years".

Common Questions

· Washability: Can they withstand washing machines? Yes, TPU or silicone-cased models are machine washable at ≤60°C; avoid bleach and tumble drying on high heat.

· Magnet Separation Risk: Will the core fall out of the casing? High-quality models use heat-sealed or stitched closures; avoid excessive stretching of fabric casings.

· Skin Irritation: Are they safe for sensitive skin? Choose medical-grade silicone or organic cotton casing (certified hypoallergenic); nickel plating may cause reactions in nickel-sensitive individuals.

· Magnetic Field Safety: Do they affect pacemakers? Keep a distance of ≥15 cm from medical devices; avoid using large quantities in a single garment.

Sewing Tips: How to prevent needle breakage? Use a leather needle and sew around the magnet edge (not through the core); adhesive-backed variants work for non-sew applications on delicate fabrics.