Safety shoes are essential labor protection equipment designed to safeguard the feet from various hazards in different working environments. As a result, there are strict regulations governing their production and use. The soles of safety shoes are typically made from rubber, which can be either natural or synthetic. Here’s a detailed look at the types of rubber commonly used:

1. Natural Rubber: Known for its softness and excellent elasticity, natural rubber is ideal for sports shoes used in activities like running or basketball. However, it has some drawbacks, such as poor wear resistance, making it more suitable for indoor use rather than high-impact outdoor activities.

2. Synthetic Rubber: This category includes several types, each with unique properties:

• Wear-resistant Rubber: Offers exceptional abrasion resistance and durability, often used in the outsoles of tennis shoes.
• Environmental Rubber: Also known as recycled rubber, this material contains up to 10% recycled content, promoting sustainability and reducing environmental impact.
• Air Rubber: Contains air pockets for cushioning and shock absorption, though it lacks significant wear resistance, limiting its application.
• Adhesive Rubber: Highly flexible and non-slip, this type is commonly found in indoor sports shoes for better grip and comfort.
• Hard Rubber: Extremely tough, non-slip, and highly wear-resistant, hard rubber is widely used in multi-purpose and basketball shoes for long-lasting performance.
• Carbon Rubber: By adding carbon to standard rubber, it becomes stronger and more durable. Most running shoes use carbon rubber for the outsole, often marked with "BRS" to indicate its presence.

3. Industrial Glue Outsole: This is a less common type of outsole made from industrial adhesives. It is mixed using a mixer, then heated and molded. The key features are softness and excellent traction, making it suitable for specific applications where slip resistance is crucial.

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