Ceramic brake pads and semi-metallic brake pads are two common types of brake pads, and they have different compositions and performance characteristics. The two types of SDCX brake pad has the following difference:

1. Composition:

• Ceramic Brake Pads: Made from a mixture of ceramic fibers, aramid,non-ferrous materials (like copper), and bonding agents. These pads are generally quieter and produce less dust.
• Semi-Metallic Brake Pads: Made from a combination of metals such as steel, iron, mixed with friction modifiers and binders. They contain a higher percentage of metal compared to ceramic pads.

2. Performance:

• Ceramic Brake Pads: They tend to perform better in terms of noise reduction and producing less dust. They are often preferred in vehicles where quiet operation and clean wheels are important. They also perform well in both low and high temperatures but might not provide as much initial bite as semi-metallic pads.
• Semi-Metallic Brake Pads: These provide more stopping power, especially at high temperatures, which makes them ideal for performance vehicles or vehicles that are heavily loaded. They are also better at resisting brake fade under heavy braking. However, they tend to be noisier and produce more brake dust.

3. Durability:

• Ceramic Brake Pads: Tend to last longer, especially on vehicles that are driven gently. They are less abrasive on the rotors, which helps prolong rotor life.
• Semi-Metallic Brake Pads: Typically have a shorter lifespan than ceramic pads, but they are more durable under extreme conditions (like heavy braking or towing) and offer better high-temperature performance.

4. Temperature Handling:

• Ceramic Brake Pads: Perform well in a wide range of temperatures but may not be as effective in extremely high temperatures (e.g., under heavy braking in racing conditions).
• Semi-Metallic Brake Pads: Excel in high-temperature situations and are better suited for aggressive driving or high-performance vehicles.

5. Cost:

• Ceramic Brake Pads: These are generally more expensive than semi-metallic pads due to the materials used and their quieter, cleaner performance.
• Semi-Metallic Brake Pads: Typically more affordable compared to ceramic pads, though the performance can vary depending on the specific mix of metals used.

6. Environmental Impact:

• Ceramic Brake Pads: Tend to be better for the environment because they produce less dust, which means fewer particles to contaminate the air and surrounding areas.
• Semi-Metallic Brake Pads: Produce more dust, which can be a concern for both cleanliness and environmental impact.

7. Noise:

• Ceramic Brake Pads: Known for being quieter during braking, which is a big plus for everyday driving.
• Semi-Metallic Brake Pads: Often noisier, especially during light braking, due to the metal content.

8. Ideal Use:

• Ceramic Brake Pads: Best for regular, everyday driving, especially in vehicles where comfort, noise reduction, and clean wheels are priorities.
• Semi-Metallic Brake Pads: Better for vehicles that see heavy-duty use, such as performance vehicles, trucks, or vehicles used for towing, as they handle high temperatures and stress well.

In summary, ceramic pads are great for quieter, cleaner driving with good longevity, while semi-metallic pads are better for high-performance applications with excellent high-temperature handling.