GB/T 35450-2017 in English

Analysis of Standard Formulation Background and Technology Evolution

Polycarbonate (PC) is a high-performance engineering plastic that is widely used in electronics, automobiles, construction and other fields due to its excellent mechanical properties, optical properties and heat resistance. With the growth of market demand and technological progress, GB/T 35450—2017 "Polycarbonate Film and Sheet" came into being, aiming to standardize product quality and ensure its safety and reliability in various fields.

The formulation of this standard is based on the technological development of materials science and the plastics industry, combined with the experience of relevant domestic and foreign standards, and optimized for the characteristics of the Chinese market. By introducing advanced testing methods and quality control systems, GB/T 35450—2017 fills the gap in the standardization of domestic polycarbonate films and sheets.

Comparison and classification of standard frameworks

Core requirements and technical indicators interpretation

Test methods and quality inspection

The standard specifies a variety of test methods, including tensile properties testing, flame retardancy evaluation, dielectric strength measurement, etc. For example, when determining tensile strength, the specimens and test conditions specified in GB/T1040.3-2006 are used to ensure the accuracy and comparability of the data.

In addition, the standard also emphasizes the importance of specimen state conditioning, requiring at least 4 hours of state conditioning at a temperature of (23±2)°C and a relative humidity of (50±10)% to ensure the consistency of the test results.

Implementation Recommendations and Quality Control

• Raw Material Selection:Select high-quality polycarbonate resin and conduct strict raw material inspection to ensure that the basic material performance meets the requirements.
• Production Process Control:Starting from the extrusion calendering or cast molding process, optimize processing parameters such as temperature, speed and cooling method to reduce dimensional deviation and surface defects.
• Quality Inspection:Establish a complete quality inspection system, conduct sampling inspection on each batch of products according to standard requirements, and pay special attention to key indicators such as tensile strength, flame retardancy and light transmittance.