(1) Electrical Insulation Performance of the Helmet: As per the testing procedure, the leakage current must not exceed 1.2 mA. This ensures that the helmet provides adequate protection against electrical hazards during use.
(2) Fire-Retardant Performance of the Helmet: Following the specified test method, the continuous burning time should not be more than 5 seconds, and the helmet shell must not catch fire or burn completely. This feature is crucial for safety in high-risk environments.
(3) Lateral Rigidity of the Helmet: According to the standard testing method, the maximum deformation of the helmet shell should not exceed 40 mm, while the residual deformation after removal of the load should not be more than 15 mm. Additionally, the shell must remain intact and not detach under pressure.
(4) Antistatic Performance of the Helmet: The surface resistance of the helmet must not exceed 1 × 10⹠Ω, as tested by the designated method. This prevents static buildup, which could pose a risk in flammable or sensitive environments.
(5) Low-Temperature Performance of the Helmet: After being pre-treated at -20°C, the helmet must pass an impact test where the force transmitted to the head form does not exceed 4900 N. The helmet shell must not break into fragments. Another sample, also pre-treated at -20°C, must undergo a puncture test. In this test, the steel cone must not touch the head form, and the helmet shell must not separate or detach.
China Labor Insurance Network
Square Ductile Gratings are a type of grating system that is commonly used in various industries and applications. These gratings are designed to provide a strong and durable solution for platforms, walkways, and other areas where heavy loads and frequent foot traffic are expected. In this article, we will explore the characteristics, features, and benefits of square ductile gratings in detail.
Square ductile gratings are typically made from ductile iron, a type of cast iron that has been treated with a small amount of magnesium to enhance its strength and toughness. This material is known for its high resistance to impact, fatigue, and corrosion, making it ideal for outdoor and industrial environments. The ductile iron construction also allows for a higher load-bearing capacity compared to other materials, such as steel or aluminum.
One of the key features of square ductile gratings is their square-shaped openings. These openings are designed to allow for the efficient drainage of water, debris, and other materials, reducing the risk of slips and falls. The square shape also provides a stable and secure surface for walking or standing, even in wet or slippery conditions. Additionally, the openings allow for ample airflow, which can be beneficial in applications where ventilation is required.
Square ductile gratings are available in a variety of sizes and load ratings to suit different requirements. The load rating refers to the maximum weight that the grating can safely support without deformation or failure. This makes it crucial to choose the appropriate load rating based on the expected load and usage of the grating. Higher load ratings are typically achieved by increasing the thickness and depth of the grating bars.
In addition to their strength and durability, square ductile gratings also offer several other benefits. One of the main advantages is their ease of installation. These gratings are often supplied in pre-fabricated panels, which can be quickly and easily installed using standard fixing method.
Square ductile gratings are also highly versatile and can be used in a wide range of applications. They are commonly used in industrial settings, such as oil refineries, chemical plants, and power stations, where heavy loads and harsh conditions are present. They are also suitable for commercial applications, such as pedestrian walkways, ramps, and platforms. The strong and durable nature of these gratings makes them ideal for areas with high foot traffic, such as airports, train stations, and shopping centers.
In conclusion, square ductile gratings are a reliable and robust solution for various industrial and commercial applications. Their ductile iron construction provides strength, durability, and resistance to impact and corrosion. The square-shaped openings allow for efficient drainage and airflow, while also providing a stable and secure surface. With their ease of installation and low maintenance requirements, square ductile gratings offer a cost-effective and versatile solution for many industries.
gratings, gully gratings, ductile gratings, cast iron gratings
Runchun Casting (Zhoushan) Co., Ltd. , https://www.en124casting.com