Quality Plastic Lock Seal Manufacturing

Quality Material Starts Excellent Plastic Lock Seal

The idea of producing high-quality plastic lock seal is far-fetched when quality is not keenly observed and strictly implemented at the very beginning. How well a product turns out aesthetically, structurally and functionally at the end all depends on the quality of its starting materials.

All security seals, be it plastic indicative seal, steel cable seal, bolt seal, padlock seal, essentially have two major components: 1) the lock body and 2) the lock cylinder. Therefore, all material constituents of these two parts, including the seal tag, the locking chamber, the belt, metal, etc., undergo stringent raw material inspection programs with precisely defined test parameters and acceptance criteria.

Lock body and lock cylinder qualities are verified during this stage by the material staff (picking member) via visual inspections, with additional dimensions testing for the lock body, either by using rulers, roll meters (tape measures), or OD (outside diameter)-measuring apparatuses. All the in-process test results obtained are then verified by the process group leader.


  • 100% New PP/Nylon Material
  • Metal
  • High-Quality Colorant
plastic lock seal material

Process Flow Chart Of Plastic Lock Seal Manufacturing

Raw Material

Sampling & Inspection

Sampling & Inspection

Sampling & Inspection

Internal Inspection
External Inspection


1. Material preparation


2. Injection Molding


3. Installation


4. Marking


5. Sampling & Inspection


8. Shipping


7. Storage


6. Packaging

plastic lock seal molding

Plastic lock seal Injection Molding

There is a crucial process that guarantees mass-production and precision of our security seals.

Firstly, mix up polypropylene resin and colorant before molding.
After that, all the raw material will be loaded into a barrel, where they will eventually be melted, compressed, and injected into the mold’s runner system. Hot resin is shot into the mold cavity through the gates, and the part is molded. Ejector pins facilitate the removal of the pieces from the mold where it falls into a loading bin.

Our skilled seal experts have an eye for detail and ensure all security tags are processed to standard dimensions for perfect appearance and functions.


  • Raw Material Blending
  • Injection Molding

Assembling Plastic Lock Seal

To prevent tampering, some tamper-resistant seals came with metal or plastic locking teeth in the lock head. The high-security seal houses the metal insert in a separate casing. This design features rolled heat staking technology to secure the metal insert to the locking chamber, which provides clear evidence of tampering if forced open or cut. 

  • Assembling Metal Teeth
  • Rolled Heat Staking Seal Body

Plastic Lock Seal Label Marking

A complete tamper-resistant seal is finished until now. The seal tag can be hot stamped or laser engraved consecutive numbers and company name, logo, laser bar code or QR code.

The computer-controlled laser engraving machine, ensuring each seal flag was printed with the same contents.


  • Hot Stamping
  •  Laser Engraving
  • Silk-screen Printing

Inspection & Packaging

To ensure strong break strength, we pick security seals randomly and sent them to our lab to finish the pull-force test.

Secondly, Our quality inspectors will check security seals via visual inspections and measuring tools to have additional dimensions testing for the lock body. And they will also sort out and destroy those defective products.

Finally, our workers will seal the qualified products with a moisture-resistance plastic bag and store them in a corrugated carton box.


  • Pull-force Testing
  • Visual Inspection
  • Packaging


After-sales service is an integral part of our product’s lifecycle. We make sure your product is ready to be treated with care, shipped, and delivered on time.

YOUME’s team provides design, logistics and technology support. Reliability is the key to everything we do.

What customer say about YOUME?

Thanks for all the positive feedback from our clients!

“I am really happy with the service and product delivery time for the custom plastic tags I ordered through Youme Tech Co. The process was really easy.”

Alex Alonzo

“Fast shipping, great customer service, and great quality. A trustworthy manufacturer. Youme Tech is really patient. Recommend to all of you.”

Roberto Gamini

“Great quality products and very good seller. Products work well just as described. Very professional and efficient. Good to do business with you. Thanks.”

Jay Prakash

“A trustworthy seller, very professional. Knowing what i need. What I really like is they do listen to the customer’s requirements. Thank you.”

Alejandro Marshall

“Reasonable price and the best quality! They do know how to deal with custom orders. It did save us a lot of time. Very satisfied. Will purchase more.”

Rana Muhammad

“Very well packed, exactly as described, fully working. Price is very competitive and quality also good. Excellent supplier, totally recommended.”

Carlos Chorrero

Custom Security Seal

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