GJB2805B-2021 Steel Airtight Door

GJB2805B-2021 steel airtight door is a high-performance airtight door. Below is its detailed introduction:

Material and Structure

• Main Material: The thickness of the main steel plate of the door should not be less than 4mm. The door frame is made of steel plates or profiles, such as Q235A 8mm-10mm steel plates. The interior can be constructed using flat steel plates, cross-shaped rib plates, ring beams, and other components welded together to form a sturdy frame structure, ensuring sufficient strength and stability.

• Door Panel Structure: A composite structure can be adopted, such as 3mm steel plate + insulation layer + 3mm steel plate. The surface undergoes anti-corrosion treatment, such as epoxy zinc-rich paint, to enhance its corrosion resistance and thermal insulation performance.

• Sealing Design: High-quality sealing strips, such as EPDM rubber seals or EPDM rubber gaskets, are embedded around the door leaf. These strips exhibit excellent elasticity and weather resistance, maintaining long-term sealing effectiveness and effectively blocking external moisture, air, and pollutants from entering the interior. Additionally, 304 stainless steel联动压紧机构 (linkage compression mechanisms), such as eccentric handles and gear-link locking mechanisms, are installed. Through mechanical transmission, these mechanisms ensure tight contact between the door leaf and the frame, making the door light-proof, air-tight, and water-tight when closed.

Airtight and Protective Performance

• Airtight Performance: Reasonable door gap and seam design, combined with high-quality sealing strips and compression mechanisms, ensure that the door is light-proof, air-tight, and water-tight after installation. When tested horizontally, it remains leak-free for 2 hours, effectively blocking external humid air, dust, and other contaminants from entering, thereby maintaining a stable indoor environment.

• Anti-Theft Performance: The main steel plate of the door leaf has a thickness ≥4mm, and the door frame is made of ≥3mm cold-rolled steel plate. Internal横向/纵向加强筋 (horizontal/vertical reinforcement ribs) are welded to form a grid-like skeleton, enhancing impact and anti-prying resistance. The door surface can be equipped with anti-drill steel plates covering the lock core area. Hinges are designed with hidden or anti-removal features to prevent external forced removal. The locking system is configured with at least three sets of multi-directional lock points, with lock tongues ≥20mm in length, made of stainless steel or alloy steel. Combined with anti-prying grooves on the door frame, this achieves "three-dimensional locking," with an overall anti-destruction capability of no less than 40 minutes.

• Anti-Explosion and Pressure Resistance: The door structure and manufacturing process are specially designed and produced, offering high strength and strong anti-deformation capabilities. The designed anti-explosion and pressure resistance typically ranges from 0.6-1.0MPa, effectively resisting external impacts such as explosion shock waves and ensuring the safety of the internal space.

Corrosion Resistance

• Surface Treatment: Before the door frame and leaf are manufactured, they undergo sandblasting or acid pickling for rust prevention, removing surface oil and impurities to enhance the adhesion of subsequent coatings. Hot-dip galvanizing can also be employed, where steel components are pickled, cleaned, and then immersed in a hot-dip bath, allowing molten metal to react with the iron substrate to form an alloy layer. This results in a uniform coating with strong adhesion and long service life, effectively resisting seawater and salt spray erosion. For cold galvanizing, the process involves cleaning, electroplating, and passivation, such as color-passivated zincate galvanizing. After passivation, the component surface should exhibit red or green colors, with no purple discoloration, and should not change color when rubbed repeatedly with fingers, thereby enhancing corrosion resistance. Additionally, zinc alloy electroplating layers, such as zinc-nickel alloy coatings, offer high corrosion resistance. Salt spray corrosion tests and surface analysis of the coatings after corrosion demonstrate their excellent anti-corrosion effects.

• Material Selection: Corrosion-resistant materials such as stainless steel or aluminum alloy can be used to manufacture the door body, effectively resisting erosion from humid environments and marine climates.

Special Features

• Ventilation Function: A three-layer airtight ventilation window can be designed, with sealing strips installed around the window frame and an outer metal mesh. This allows for ventilation between the interior and exterior, expelling indoor humidity and harmful gases, while preventing insects and rodents from entering. It also provides certain filtration capabilities.

• Fire Resistance: The surface undergoes special treatment, providing good fire resistance. It can withstand fire to a certain extent, meeting fire safety requirements. In emergencies such as fires, it effectively blocks flame propagation, protecting the safety of indoor personnel and property.

Application Scenarios

• Military Applications: Widely used in ordnance warehouses, special storage rooms, cave depots, ships, and other locations to prevent humid air, water, fire, toxic gases, etc., from entering. It also offers certain anti-theft functionality, ensuring the safety and stability of military supplies.

• Civilian Applications: Suitable for basements, warehouses, laboratories, bank vaults, cold storage, food processing workshops, and other environments with strict requirements. It effectively isolates external humid air, dust, etc., maintaining internal environmental stability and protecting stored items from moisture and water damage, ensuring their quality and safety.