Five national standards, including heat-resistant polyethylene (PE-RT) valves, were released on March 15th! 2024-07-04
Five national standards, including heat-resistant polyethylene (PE-RT) valves, were released on March 15th!
What is PVC low-pressure irrigation pipe? How low is the pressure? 2024-07-04
According to the national standard, the pressure of PVC irrigation pipes is divided into five types: 0.25MPa, 0.32MPa, 0.4MPa, 0.5MPa, and 0.63MPa. The pressure bearing capacity is relatively small, which is also the main difference between PVC irrigation pipes and PVC water supply and drainage pipes. PVC irrigation pipe, also known as PVC irrigation pipe, full name of low pressure irrigation rigid polyvinyl chloride (PVC-U) pipe, is made of PVC resin powder as the main raw material, with appropriate additives added, processed and formed through mixing, extrusion, sizing, cutting and expanding processes. PVC irrigation pipes are mainly used to transport water from water sources to fields. Due to the relatively low irrigation pressure (0.25-0.63MPa), they are called low-pressure irrigation pipes.
What are the effects of carbon black on the performance of PE pipes? 2024-07-02
Performance, Types, and Antibacterial Effect Evaluation of Plastic Antibacterial Agents 2024-06-07
The properties that antibacterial agents should possess (1) It has efficient and broad-spectrum antibacterial properties, good antibacterial persistence, and can maintain long-term antibacterial properties of antibacterial plastics; (2) Non toxic and odorless, no pollution to products and the environment; (3) Good compatibility with plastics and no adverse effects on the performance of plastic products; (4) Good color stability, does not change color during storage and use; (5) Has good chemical stability, resistant to acid, alkali, and chemical drugs; (6) Low price, without significantly increasing the cost of materials after use; (7) Has high thermal stability, does not decompose or deteriorate during plastic extrusion and processing.
Preparation stage for testing and precautions during the testing process 2024-06-07
Preparation stage for testing and precautions during the testing process What are the examination methods, assessment applications, and assessment evaluations for on-site experiments in the new version of the "Qualification Accreditation Review Criteria"? CMA on-site test assessment method On site testing and assessment of inspection and testing institutions can be carried out through witness testing, blind sample assessment, and operational demonstrations; Personnel comparison, instrument comparison, and sample retesting can also be adopted. The sample sources include those provided by the review team and those provided by the inspection and testing agency. Application of CMA on-site test assessment results In principle, all original records and necessary inspection and testing reports must be provided for on-site testing, except for operation demonstrations; When using electronic records, attention should be paid to the accuracy, completeness, and security of electronic data. In on-site assessment, if the result data is unsatisfactory, the inspection and testing agency should be requested to analyze the reasons; If it is due to accidental reasons, inspection and testing institutions can be arranged to retest; If it belongs to system deviation, it should be considered that the inspection and testing institution does not have the ability to conduct the inspection and testing. Evaluation of CMA on-site testing After the on-site test is completed, the review team should evaluate the results of the test, including whether the inspection and testing methods used are correct; Check whether the expression of test data and results is standardized and clear; Whether the inspection and testing personnel have the corresponding inspection and testing capabilities; The suitability of environmental facilities; Whether the collection, identification, distribution, circulation, preparation, preservation, and disposal of samples are standardized; Check whether the debugging and use of testing equipment and testing systems are correct; Check whether the inspection and testing records are standardized, etc; The review team provides an overall evaluation conclusion in the on-site assessment project table.
Nylon family in engineering plastics 2024-06-07
Polyamide, commonly known as Nylon or PA in English, has a density of 1.14g/cm3. It is a general term for thermoplastic resins containing repeated amide groups - [NHCO] - on the molecular main chain, including aliphatic nylon and aromatic nylon (aromatic nylon also includes semi aromatic nylon and fully aromatic nylon). Among them, there are many varieties of aliphatic nylon, with large production and wide applications. Their names are determined by the specific number of carbon atoms in the synthesized monomers, such as PA66, PA12, etc; Most aromatic nylon is high-temperature nylon, and its usage is not as large as aliphatic nylon. However, due to its excellent properties, there are increasingly more valuable applications for development, such as PA9T, PA6T, etc. Today, Xiaowei will discuss the nylon family in engineering plastics based on two parts: aliphatic nylon and aromatic nylon.
Name：
Telephone：
Message：
Phone
Mailbox
WeChat
冀公網(wǎng)安備 13080502000095號
