Plastic seals are protective devices mainly produced from engineering-grade plastics, developed to prevent counterfeiting, theft, and tampering. They are extensively applied across different industries and usage scenarios, with the primary purpose of ensuring the integrity and security of goods during transportation or application. A plastic seal is a single-use self-locking device. Its color options are highly diverse, supporting customization of colors as well as logo printing. The size specifications are also available in multiple variations. Plastic seals feature adjustable lengths and provide anti-counterfeiting and anti-tampering functions. They are mainly used in logistics transportation, medical and storage sectors, as well as for specialized sealing of video and beverage products, and as plastic tags for bags and garments.
Transportation & Logistics
Truck and container seals: Manufactured from polypropylene, these high-strength seals (with breaking strength up to 55 lb) are used to secure cargo doors and fuel tanks. Versions with numbering and laser printing enable traceability.
Submarine hatches: Large plastic seals produced from Nylatron™ MC 907 PA6 are used to seal acrylic spheres in manned submersibles, complying with strict marine safety standards without requiring lubrication. Plastic seals are tamper-evident or sealing devices primarily made from plastic materials, designed to protect containers, equipment, or systems against unauthorized access, contamination, or leakage. They are widely applied across industries due to their durability, cost efficiency, and traceability.
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Model No |
ST8049 |
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Brand Name |
SHENGTANG |
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Material |
PP+PE |
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Color |
Red,yellow, blue，green, white,pink， purple and customized |
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Total Length |
170mm |
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Marking area |
21*40mm |
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Diameter |
2mm |
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Printing type |
Laser printing& hot stamping |
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Printing content |
1.Thermal stamping or laser printing 2.Customer's company name&logo, Sequential numbers 3.Bar code or Qrcode is available |
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Package |
200pcs/bag, 5000pcs/ctn，carton size:57*47*46cm |
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Lock type |
self-locking security plastic seal |
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Application |
All kinds of Containers, Trucks, Tanks, Doors Postal services, Courier services, Bags, etc. plastic seals are tamper-evident or sealing devices made primarily from plastic materials, designed to secure containers, equipment, or systems against unauthorized access, contamination, or leakage. They are widely used across industries for their durability, cost-effectiveness, and traceability. |
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Features |
1. plastic materials, easy for recycling Removal by heavy duty plastic cutter, and eyes protection necessary. |
Plastic seals are widely used across multiple industries to ensure product integrity, tamper evidence, and operational safety, with key applications in food, pharmaceuticals, energy, transportation, and high-precision scientific fields. Typical applications include securing truck doors, trailer doors, totes, valves, airline catering carts, coin bags, inner drum bags, storage bags, and any container fitted with a hasp or loop structure.
Plastic seals are also widely applied to secure containers, tanker trucks, and courier packaging bags, preventing unauthorized opening or tampering with goods during transit. Their single-use design and unique numbering system ensure that any manual removal leaves clear visible evidence, thereby enhancing transportation security and cargo protection.
In courier packaging and e-commerce logistics, single-use anti-counterfeiting plastic seals (also known as security tags) are commonly used. Featuring custom textures or printable corporate logos, they help improve brand recognition while strengthening consumer trust and confidence.
In electric, water, and gas metering systems, plastic padlock seals (such as AC&M Type 7001) provide secure, disposable locking with visible tamper indication. These seals are especially suitable for smart meters with remote reading, where inspections are infrequent and require durable, long-lasting sealing performance.
Made from engineering-grade polymers such as:
Low-cost security seals made from durable materials with a single-use irreversible locking structure. Once applied, the seal cannot be reopened or restored, ensuring effective tamper prevention and secure usage in logistics, transportation, and storage applications.
Manufactured from PP or engineering-grade plastics, providing consistent high tensile strength. These materials ensure reliable resistance to pulling force, impact, and deformation under various industrial and commercial sealing conditions.
Direct factory supply with competitive pricing and no middleman costs. Customizable samples are available for testing and approval. Strict quality control is applied throughout production to ensure stable and reliable product quality.
With extensive export experience and qualifications, we support sea, air, and land transportation. Flexible logistics solutions ensure efficient delivery according to different customer requirements and international shipping needs.
Supports laser engraving, unique serial numbering, and tamper-evident markings for enhanced security. Some models can integrate RFID technology, enabling digital tracking, monitoring, and improved supply chain traceability.
Sealing can be completed easily with one hand and requires no tools. This simple operation design improves efficiency, making it suitable for high-frequency working environments such as logistics and warehouse operations.
Common materials include:
HDPE: Durable, chemical-resistant, and cost-effective for general sealing use.
PP: Resistant to chemical degradation, suitable for pharmaceuticals and sensitive goods.
Elastomer-blended plastics: Offer flexibility and resilience, combining rigid plastic strength with rubber-like performance.
Plastic seals are much lighter than metal alternatives, reducing total system weight. Their design allows fast, tool-free installation, improving assembly speed and reducing labor costs in automotive, aerospace, and logistics applications.
Most plastic security seals are one-time use with visible locking structures. Once broken, resealing is impossible without detection. Features such as laser serial numbers, barcodes, color coding, and holograms ensure full traceability and compliance.
Pull-tight plastic seals can be adjusted to fit different container sizes, making them suitable for irregular cargo. This flexibility improves usability across industries such as logistics, utilities, transport, and security sealing applications.
1. Q: Who are we?
A: We are based in Shandong, China, start from 2012, sell to Mid East, South Asia, Northern Europe,Africa, North America, Western Europe. There are total about 200-300 people in our office.
2. Q: How can we guarantee quality?
A: Always a pre-printing sample before mass production;
Always final Inspection before shipment;
3. Q: What can you buy from us?
A: bolt seal,cable seal,plastic seal,meter seal,metal strap seal, etc.
4. Q: Why should you buy from us not from other suppliers？
A: 12 years experiences, 300 sets of models with different style , meet your different demands with fast delivery. All our material is environmental, we won many honors from government. Our goods are popular in 300 countries.
5. Q: Do you accept custom orders?
A: Yes. We provide comprehensive OEM & ODM customization services, including:
LOGO printing and unique serial numbering
Customized sizes, colors, materials, and packaging
6.Q: What certifications do you have?
A: We maintain a complete and internationally recognized certification system, including:
ISO 9001 – Quality Management System
ISO 14001 – Environmental Management System
ISO 45001 – Occupational Health & Safety Management System
ISO 17712 – High-Security Seal Certification
Third-party test reports from SGS and other authorized institutions
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