Filling material for solving leakage of steel drums - sealant
Sealing Material for Preventing Leaks in Steel Drums
Wang Shilin
The Measures for the Administration of Packaging Inspection of Maritime Export Dangerous Goods, issued by the Ministry of Communications and the State Administration of Commodity Inspection, have been in effect since July this year. This regulation has significantly impacted the export packaging industry, especially for 200-liter steel drums. After passing rigorous tests such as the "gravity drop" and "falling test," these drums can receive a "Dangerous Goods Packaging Verification Certificate." However, many manufacturers are still struggling with the issue of leaks, which affects both production efficiency and product quality.
According to industry data, approximately 10% of leaks occur at the barrel body, 5% at the straight seam, and a staggering 85% at the bottom, particularly around the T-shaped mouth. To address this, improving machinery is essential, but the most effective solution remains the use of high-quality sealing materials that are both corrosion-resistant and impermeable. These materials play a crucial role in preventing leakage during transport and storage.
In recent years, our company has collaborated with Zhejiang Yongkang Chengguan Hardware Factory to supply 200-liter steel drums for international exports. We have also used the sealing sealant produced by Xiamen Kaiyuan Latex Factory. This natural latex-based product is safe for food containers like honey cans and is widely used in industrial applications, including oil and solvent storage. It effectively prevents content leakage by forming a strong, flexible barrier.
Previously, we tested DAREX water-based canned sealant from Japan, which contains latex as its main component. When exposed to oils, alcohols, aldehydes, or ketones, the sealant expands upon contact, creating an effective leak-proof layer. This principle is also applied in the Xiamen-made sealant, offering a similar advantage to traditional methods like using brown sugar and bone glue. These materials have long been relied on for their durability and effectiveness in sealing steel drums.
However, proper application of the sealing material is key to achieving a reliable seal. Before use, it's important to mix the sealant thoroughly. It should not be diluted unless necessary. If the consistency is too thick, you may add a small amount of soft water or even nitrogen water. There are two common application methods:
1. Apply the sealant using a semi-automatic coating machine before crimping the drum lid. The nozzle is fixed on a bracket, and the lid rotates on a tray. Apply 1.5–2 kg/cm² of pressure to evenly coat a narrow strip (about 2–3 mm wide) on the lid. After application, let it air dry for one hour. For faster drying, you can place the lid in a 70–80°C environment for 20 minutes (see Figure 1).
2. Apply the sealant during the crimping process. Be careful to spray it on the side of the drum when the lid is just being rolled up—when the edge is bent. This prevents the filler from being thrown out due to centrifugal force during high-speed rotation (see Figure 2).
Considering the relatively low daily output of smaller steel drums, it is recommended to use the first method to ensure consistent quality and prevent leaks. Proper sealing is not only about the material used but also about how it is applied. Following these guidelines can significantly reduce the risk of leakage and improve overall safety and compliance in maritime exports.
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