1. Determination method of tensile strength
Tensile strength is one of the key physical properties to measure the quality of PVC seal. It is generally determined by tensile test. The PVC seal is made into a standard dumbbell-shaped specimen and placed on the fixture of the tensile testing machine. Then the specimen is stretched at a certain speed, and the maximum tensile force value when the specimen breaks is recorded. The value of tensile strength can be obtained by dividing this maximum tensile force value by the original cross-sectional area of the specimen. This test process requires strict control of the temperature and humidity of the test environment, because environmental factors may affect the tensile properties of the PVC seal.
2. Importance of tensile strength in practical applications
In practical applications, tensile strength is closely related to the service life and sealing effect of PVC seal. For example, in door and window sealing, the sealing strip will be stretched when the door and window are opened and closed. If the tensile strength is insufficient, the sealing strip can easily be stretched and deformed, resulting in poor sealing, which in turn affects the indoor thermal insulation and sound insulation effect. Moreover, the deformed sealing strip may not be able to return to its original state, shortening its service life.
3. Differences in applicable scenarios of PVC seals with different tensile strengths
PVC seals with high tensile strength are suitable for applications that require frequent opening and closing and have high sealing requirements, such as the sealing of car doors and trunks. During the frequent opening and closing of car doors, the sealing strip has to withstand a large tensile force, and high tensile strength can ensure its normal operation. For some scenarios with lower tensile requirements, such as the sealing of some indoor furniture, the tensile strength requirements are relatively low, but basic usage requirements must also be met to prevent damage due to accidental stretching.
4. Comprehensive consideration of tensile strength and other properties
In practical applications, we cannot only focus on tensile strength, but also need to consider other properties of PVC seals comprehensively. For example, elastic recovery rate. If the tensile strength is high but the elastic recovery rate is poor, the sealing strip cannot recover well after stretching, which will also affect the sealing effect. In addition, aging resistance, chemical corrosion resistance, etc. will also work together with tensile strength to determine the actual use effect of PVC seals in various complex environments.
