Optimal Hardness for Textile Silicone Labels & Pros/Cons of Deviations
Optimal Hardness Range: 40 – 50 Shore A
1. Core Technical Parameter: Recommended Hardness Standard
Optimal Hardness Range: 40 – 50 Shore A
Key Advantages:
Soft and flexible, perfectly fits various textile fabrics without warping
Excellent bending resistance, no deformation after repeated folding and stretching
High washing resistance, stable performance, no cracking after multiple industrial or household washes
Comfortable touch, no sharp edges, compliant with consumer product safety standards for wearable items
2. Disadvantages of Excessive Hardness (> 70 Shore A)
Poor Flexibility & High Cracking Risk: Over-hard silicone is brittle and prone to cracks under bending, stretching or long-term dynamic use; damage rate increases sharply in frequent washing and daily wear scenarios.
Reduced Adhesion Fastness: Insufficient surface elasticity leads to poor fitting with textile substrates; heat-transfer and self-adhesive labels are easy to warp, peel off or fall off.
Uncomfortable Tactile Experience: Obvious foreign body sensation when attached to clothing/footwear, may cause skin irritation or scratches, failing consumer wear experience requirements.
Increased Processing Difficulty: Poor fluidity during molding/extrusion, easy to cause incomplete filling, blurred patterns/edges, and poor surface finish of finished labels.
3. Disadvantages of Overly Low Hardness (< 30 Shore A)
Poor Shape Retention & Easy Deformation: Lack of stiffness, patterns and characters are easy to collapse and blur; labels may stick together or deform during transportation and storage.
Insufficient Wear & Scratch Resistance: Soft surface is easy to scratch and wear; patterns fade or blur quickly after long-term use, not suitable for daily durable wear.
Poor Adhesive Compatibility: Easy to be pressed thin or displaced during heat transfer processing; reduced bonding strength of hot melt adhesive and back adhesive, leading to easy falling off.
Weak Aging Resistance: Low crosslinking density, easy to yellow, become sticky and age rapidly under long-term sunlight and high temperature exposure.