Lug Covers For 2.5 To 7 Gallon Metal Pails

Lug covers (also called flower lids, crimp lids or crown lids) are one-time sealed metal lids specially matched for open-head steel pails. Multiple evenly spaced metal tabs named "lugs" circle the lid edge, which are crimped tightly onto the pail rim via pneumatic crimping machines to form a fully hermetic seal.

2. Core Structure & Composition
1. Lid Base Body
Main material: Electrolytic tinplate (ETP) / cold-rolled carbon steel, thickness 0.28–0.40 mm. Outer surface can be painted white, blue, green or customized printed with logos.
2. Circumferential Lugs (Tabs)
16 folded metal lugs distributed evenly around the edge; these folded tabs lock the lid and pail rim after crimping.
3. Sealing Gasket Liner
Food-grade rubber, plastisol or solvent-resistant foam liner pre-laminated inside the lid, eliminating gaps to stop liquid leakage, solvent volatilization and moisture ingress.
4. Optional Spout Hole
Custom small pouring spout pre-punched on partial lug covers for convenient liquid dispensing without full lid removal.

3. Raw Material & Lining Options
   Outer Surface Treatment
- Standard: Anti-rust baking paint (white, blue, black stock colors)
- Premium: Galvanized anti-corrosion coating for outdoor damp storage
- Custom: CMYK offset printing for brand labels, hazard warning marks

  Inner Sealing Liners (matched to contents)
- Plastisol liner: General use for paint, ink, lubricants, common industrial chemicals
- Epoxy-phenolic liner: Anti-solvent, compatible with thinners, resin, adhesive
- Pure tin food-grade liner: For edible oil, food additives, cosmetic raw materials
- Fluoropolymer lining: Heavy corrosion resistance for weak acid & alkali chemicals

4. Working Sealing Principle
1. Place the lug cover flat onto the open mouth of the metal pail;
2. Use a dedicated pneumatic crimping tool to fold all lugs downward tightly around the pail's rolled rim;
3. Compress the inner gasket evenly between lid and rim to achieve full airtight & leakproof closure;
4. Once crimped, the lug structure cannot be restored after opening, forming obvious tamper evidence.

5. Key Advantages
1. Ultra-Tight Hermetic Sealing
Better barrier performance than lever lock lids; effectively blocks oxygen, UV and solvent vapor, extending shelf life of coatings and hazardous liquids. Supports UN 1A2 dangerous goods packaging certification for sea, land and air transport.
2. Tamper-Evident Security
Single-use crimp design; lugs deform permanently when pried open. Any unauthorized opening leaves clear visible traces, ideal for regulated chemicals and finished paint products.
3. Low Cost & High Efficiency Mass Production
Simple structure, lower unit cost than bolt lock or lever lock rings; fully automatic crimping on filling lines to boost packaging speed.
4. Wide Size Compatibility
Standard sizes fit 2.5gal, 3gal, 5gal, 6gal, 7gal imperial pails, and 10L/15L/20L/25L metric steel pails. Custom diameters available for special pail models.
5. Full Metal Recyclability
Tinplate material can be completely recycled after cleaning, meeting EU packaging waste environmental standards.

6. Limitations vs Lever Lock Lids
- Disposable closure: Cannot be re-sealed after opening (lever lock rings are reusable dozens of times)
- Tool dependent: Must use a crimping machine to seal; no manual quick open/close function
- Hard internal cleaning: After crimp sealing, residual thick paste inside pails is hard to fully recover

7. Main Application Industries
1. Coatings & Printing Industry: Finished latex paint, oil paint, printing ink, pigment paste, curing agent
2. Petrochemicals: Lubricating grease, metal cutting fluid, anti-rust oil, industrial solvent
3. Hazardous Chemical Packaging: Low & medium risk liquids requiring UN-certified single-use sealed containers
4. Food & Cosmetics: Edible grease, wax, cosmetic base cream (with food-grade liner)
5. Construction Chemicals: Waterproof putty, epoxy filler, construction sealant

8. Brief Quality Control Standards
- 100% air leak test after crimping to eliminate pinhole leakage
- Liner adhesion test to prevent peeling under solvent immersion
- Lug folding strength inspection to avoid loose sealing during stacking & transportation
- Available certificates: UN dangerous goods packaging certificate, food contact safety test report

Short Commercial Version (for catalog & B2B listing, ~180 words)

Lug covers, also known as flower crimp lids, are disposable hermetic closures for metal open-head pails, widely adopted in paint, chemical and hazmat packaging. Manufactured from electrolytic tinplate with evenly distributed folding metal lugs around the edge, they are sealed via pneumatic crimping machines together with built-in rubber/plastisol gaskets to deliver superior leakproof and vapor-proof performance.

Available for 2.5–7 gallon and 10–25L standard steel pails, lug covers support multi-color painting and custom printing, with optional epoxy, food-grade tin or fluoropolymer inner liners for different contents. Their one-time crimp design provides clear tamper evidence, complying with UN 1A2 hazardous goods transport standards.

Compared with reusable lever lock rings, lug covers feature lower cost and higher filling line efficiency, though they cannot be reclosed after opening. Ideal for finished paint, ink, lubricants and single-batch industrial chemicals requiring long-term sealed storage and safe logistics.

1.Choose cost efficient freight for clients and offer CO and other document needed.

2.Defective percentage of our steel cans and buckets are both under 0.1%

3.We have ability and successful cases for making special steel cntainer and plastic OEM products for clients.

Established over 25 years ago, Feihong Steel Packaging Co., Ltd. specializes in manufacturing UN Spout-Top Lug Cover Lid for 5 Gal Open Head Steel Pails for various industries. With a focus on customization, quality, and innovation, the company has earned a reputation as a trusted partner for packaging solutions both domestically and internationally.

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