欧美老女人男女插插视频,免费毛片一动漫片成人片,天天爽夜夜爽久久爽人人,公交车被多男摁住灌浓精

+ WeChat number:語(yǔ)言切換+微信彈窗

Your location: Home -> Information dynamic -> Industry News

Recommended Products

How to use a plastic toolbox made of PP material

Source:m.lepinzhe.com      Release date: 2025-09-22
The plastic toolbox made of PP material has many advantages, but also some limitations. The following is a specific introduction: 1. Advantages Lightweight and portable: The density of PP material is only 0.90-0.91g/cm 3, which is lighter than water. PP material toolboxes of the same volume are lighter in weight than metal or other plastic toolboxes, making them easy to carry and move, an
      The plastic toolbox made of PP material has many advantages, but also some limitations. The following is a specific introduction:
1. Advantages
       Lightweight and portable: The density of PP material is only 0.90-0.91g/cm 3, which is lighter than water. PP material toolboxes of the same volume are lighter in weight than metal or other plastic toolboxes, making them easy to carry and move, and reducing the burden on users.
       Good heat resistance: PP plastic products can work for a long time at 100 ℃, and will not deform even when heated to 150 ℃ without external force. Compared with other general plastics, it has better heat resistance and can adapt to certain high temperature environments.
       Good mechanical properties: PP has higher strength and elasticity than HDPE, and has good tensile strength and rigidity. It has excellent formability and is not easily damaged even when bent. It is known as the "hundred fold adhesive" and can withstand certain external forces and pressures.
       Strong chemical stability: PP is inert to most acids, bases, salts, and oxidants, and is stable in concentrated phosphoric acid, hydrochloric acid, 40% sulfuric acid, and their salt solutions at 100 ℃. Only a few strong oxidants such as fuming sulfuric acid can change it, and it has good corrosion resistance.
       Excellent insulation performance: PP hardly absorbs water, its insulation performance is not affected by temperature, and it has good high-frequency insulation, suitable for storing electrical tools or using in electrical work environments.
       Beautiful and diverse appearance: PP material has strong plasticity and can be made into various shapes and colors of toolboxes through injection molding and other processes. The appearance is beautiful and generous, which can meet the personalized needs of different users.
2. Disadvantages
       Poor low-temperature impact performance: PP has poor impact strength in low-temperature environments, is prone to becoming brittle, and may rupture when subjected to external impact.
       Weak UV resistance: PP has a low resistance to UV radiation and is prone to aging and degradation when exposed to sunlight for a long time, resulting in decreased performance, discoloration, and brittleness.
       Easy to dent: Due to the elasticity of PP, plastic products produced are prone to dent when subjected to high pressure or sharp objects.
京山县| 岫岩| 黄石市| 扎赉特旗| 宁武县| 元朗区| 夹江县| 钟山县| 永年县| 南宁市| 永清县| 石狮市| 南部县| 枣阳市| 丹寨县| 中西区| 吉木萨尔县| 谷城县| 南丰县| 安吉县| 弋阳县| 平定县| 延长县| 大冶市| 北京市| 梁平县| 房山区| 剑阁县| 内乡县| 深州市| 长汀县| 油尖旺区| 怀化市| 吉林市| 新田县| 资中县| 伊通| 达孜县| 五寨县| 大埔区| 平凉市|