How to Distinguish Genuine LSZH from fake LSZH (Disguised as PVC) in Fiber Patch Cords?

5 Tips for Remote International Procurement

When sourcing globally, LSZH fiber patch cords carry a noticeable price premium compared to regular PVC ones. Unfortunately, some unscrupulous suppliers exploit this price gap by printing "LSZH" on cables that are actually made of cheap PVC—a deceptive tactic to win price-driven bids.

If your LSZH patch cords come at a suspiciously low price, proceed with extreme caution. This isn't just a bad deal—it could expose your business to serious safety hazards and legal liabilities.

I. Four Risks of Fake LSZH (Actual PVC)

1. Toxic Fumes & Impaired Evacuation – When burned, PVC releases hydrogen chloride (HCl) gas, which is highly toxic and can cause asphyxiation. Thick black smoke also severely blocks visibility, hindering escape and rescue efforts.

2. Fire Acceleration – PVC is flammable and produces burning molten drips that can ignite surrounding materials, rapidly spreading the fire. Genuine LSZH is flame-retardant and self-extinguishing with no dripping.

3. Regulatory Non-Compliance – Failing to meet international fire safety standards (e.g., IEC, UL) can cause project acceptance to be rejected, leading to contract disputes and costly compensation claims.

4. Irreparable Reputation Damage – If your end customer discovers the material fraud, your company can be blacklisted from future tenders, permanently losing credibility in the industry.

II. 5 Simple Physical Checks to Screen for Fake LSZH

The most direct method is a burn test (genuine LSZH produces minimal pale white smoke with no pungent odor; PVC produces thick black smoke with a sharp, irritating smell). For remote procurement, ask your supplier to perform any of these 5 non-destructive quick checks:

1. Gloss Level

• Genuine LSZH: Matte finish, low gloss, slightly rough texture(left)

• Fake LSZH (Actual PVC): Shiny surface, visibly glossy(right)

  Black fiber jumper for example:

2. Flexibility

• Genuine LSZH: Stiffer, resists bending, slow to recover

• Fake LSZH (Actual PVC): Soft, highly flexible, springs back quickly

3. Ink Rub Test (with alcohol or nail polish remover)

• Genuine LSZH: Print markings are durable and resistant to rubbing

• Fake LSZH (Actual PVC): Markings rub off easily—a red flag for aftermarket printing

4. Weight Comparison (same specification and length)

• Genuine LSZH: Heavier due to inorganic flame retardants

• Fake LSZH (Actual PVC): Lighter in comparison

5. Fingernail Pinch Test

• Genuine LSZH: Leaves a persistent white dent that recovers slowly

• Fake LSZH (Actual PVC): Springs back quickly, leaving no visible mark

⚠️ Important Caveat: The fingernail test alone is not 100% conclusive. High-performance modified LSZH may recover faster, while low-quality recycled PVC can also leave white marks due to plasticizer loss. Always pair these quick checks with a burn test or a water flotation test for final verification.

III. Nanjing LinkFiber: 100% Genuine LSZH

At Nanjing LinkFiber, we understand that material integrity is non-negotiable when it comes to your project's safety and your company's reputation. We make this promise: every LSZH patch cord we deliver is 100% compliant with international standards—no substitutions, no misleading markings.

We offer fully customizable solutions to support your carrier-grade or high-density projects:

• Connector Types: E2000/APC, LC, SC, FC, etc

• Jacket Materials: Genuine LSZH or PVC, as specified

• Color Options: Yellow, orange, black, white, etc

• Custom Lengths: From 1 meter to 30+ meters, tailored to your needs.

  
  

Want to avoid the trap of cheap fakes? Your next project deserves a connection you can trust.

Send your specifications (length, jacket material, connector type) to our sales team today. Nanjing LinkFiber delivers 100% verifiable, high-quality products with full technical support to ensure your project lands safely and successfully.

https://www.linkfiberpro.com/LF002-single-mode-fiber-patch-cord-sc-fc-lc-simplex-duplex

https://www.linkfiberpro.com/LF005-wholesale-single-mode-apc-upc-patch-cord

https://www.linkfiberpro.com/LF009-multimode-fiber-patch-cord-om3-sc-lc

See complete testing video on youtube: https://youtube.com/shorts/jukKfgOfiIE?feature=share