The difference between national standard asphalt and non-standard asphalt.
With the acceleration of urbanization, the demand for asphalt is increasing, and different standards of asphalt products have appeared in the market. Among them, national standard asphalt and non-standard asphalt are the two most common, and they are very different in terms of quality and quality. This article will make a detailed comparison of these two types of bitumen so that consumers can better understand and choose the right product for themselves. 
1. Definitions and Standards.
National standard asphalt, that is, asphalt that meets national standards, its quality and performance indicators meet the requirements stipulated by the state. There are strict standards and specifications for the production and use of national standard asphalt, which is one of the widely used materials in construction projects.
Non-standard asphalt, that is, asphalt that does not meet national standards, its quality and performance indicators fail to meet the requirements stipulated by the state. The ** of non-standard asphalt is relatively low, but there are certain risks and hidden dangers in the process of use.
2. Quality and performance.
The quality and performance of the national standard asphalt have reached the national standards, with good durability, stability and compressive performance, and can meet the construction requirements of various climates and environments. The production process of national standard asphalt strictly follows the national standards, and the raw materials and additives used are also in line with national regulations, with reliable quality and stable performance.
The quality and performance of non-standard asphalt is relatively poor, and there may be certain problems in terms of durability, stability and compressive performance. In order to reduce costs, inferior raw materials or reduce the amount of additives may be used in the production process of non-standard asphalt, resulting in unstable quality and reduced performance. 
3. ** and value.
The national standard asphalt is relatively high because of its high production cost, reliable quality and stable performance. However, the national standard asphalt has a long service life, low maintenance cost, and can ensure the long-term stability and safety of the project, so its cost performance is relatively high.
The ** of non-standard asphalt is relatively low, because its production cost is low and the quality is poor. However, non-standard asphalt has a short service life, high maintenance costs, and may have potential safety hazards and risks, so its cost performance is relatively low.
Fourth, selection and use.
When choosing asphalt, consumers should consider it comprehensively according to the engineering requirements and their own needs. If the project requirements are high and the safety and long-term stability of the project need to be ensured, it is recommended to choose national standard asphalt; If the engineering requirements are low, you can consider choosing non-standard asphalt that meets the engineering requirements. However, you should be cautious when choosing non-standard asphalt to avoid ignoring its potential quality problems and risks due to low quality. 
In short, there is a big difference between national standard asphalt and non-standard asphalt in terms of quality and performance. Consumers should consider the products that are suitable for them according to their own needs and engineering requirements. At the same time, the correct construction process and use methods should be followed when using asphalt to ensure the safety and stability of the project.