Spherical fine-pore silica gel 4-8mm moisture-proof desiccant

Spherical fine-pore silica gel is an inorganic industrial product with unique physical and chemical properties, widely used in multiple fields. The following are its main characteristics and applications:

Physical and Chemical Properties

• Appearance: Milky white translucent spherical glass body, non-toxic, odorless, and pollution-free.
• Pore Structure: Average pore size ranges between 2.0–4.0 nanometers, with a specific surface area of >650 m²/g.
• Adsorption Performance: Exhibits selective adsorption capacity for polar molecules such as water vapor and sulfur dioxide at room temperature, without reacting chemically with most gases.

Application Fields

1. Gas Drying and Purification: Used as a gas drying and purifying agent, achieving complete desorption and activation within the temperature range of 120–130°C.
2. Moisture and Rust Prevention: Suitable for moisture prevention in packaged items such as instruments, meters, electrical equipment, pharmaceuticals, and food.
3. Catalyst Carrier: Employed for the dehydration and refining of organic compounds.
4. Air Purification: Functions as an air purifier to control air humidity, particularly effective for moisture prevention of goods during maritime transport.

Process Parameters

• Desorption Temperature: Desorption requires 120 minutes at 80°C; when the temperature rises to 120°C, desorption time shortens to 40 minutes; at 130°C, desorption is completed in just 25 minutes.
• Bulk Density: Ranges from 670–750 g/L, with an abrasion rate of ≤10%.

Industry Standards

• The current standard system categorizes silica gel products into three types: fine-pore silica gel, coarse-pore silica gel, and color-changing silica gel. Fine-pore silica gel (pore size 2–3 nm) emphasizes drying performance, with a specific surface area over 30% higher than the coarse-pore type.
• The national standard GB 7820-1987 has been replaced by HG/T 2765.1-1996, which stipulates that the qualified product particle size pass rate must be ≥90%