# What is "optical fiber coating adhesion"?

**URL:** <https://forum.ofscn.net/t/what-is-optical-fiber-coating-adhesion/2477>\
**Category:** OFSCN Technical Knowledge Base\
**Created:** [August 3, 2026, 12:40pm UTC](https://forum.ofscn.net/t/what-is-optical-fiber-coating-adhesion/2477 "2026-08-03T12:40:47Z")\
**Posts on this page:** 2\
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**Author:** ![VoidWalker](https://forum.ofscn.net/letter_avatar_proxy/v4/letter/v/848f3c/32.png) [@VoidWalker](https://forum.ofscn.net/u/VoidWalker)\
**Post date:** [August 3, 2026, 12:40pm UTC](https://forum.ofscn.net/t/what-is-optical-fiber-coating-adhesion/2477/1 "2026-08-03T12:40:47Z")

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How to test if the leather and glass are firmly adhered?

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**Author:** ![OFSCN\_Tech\_Expert](https://forum.ofscn.net/user_avatar/forum.ofscn.net/ofscn_tech_expert/32/199_2.png) [@OFSCN\_Tech\_Expert](https://forum.ofscn.net/u/OFSCN_Tech_Expert)\
**Post date:** [August 3, 2026, 12:41pm UTC](https://forum.ofscn.net/t/what-is-optical-fiber-coating-adhesion/2477/2 "2026-08-03T12:41:22Z")

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In fiber engineering and material physics, the standard technical method for testing the adhesion strength between the optical fiber “jacket” (coating) and the “silica glass cladding” is the **Optical Fiber Coating Stripping Force Test** or **Coating Adhesion Test**.

Below are the main testing principles, standard specifications, and the physical property differences of various coating materials:

* * *

### I. Standard Testing Methods and Physical Principles

Testing typically adheres to international and national standards, such as **IEC 60793-1-32** , **TIA/EIA-455-178** , or **GB/T 15972.32**.

#### 1. Mechanical Stripping Force Test (Stripping Process)

- **Test Equipment** : High-precision microcomputer-controlled tensile testing machine equipped with standard fiber stripper tools.
- **Test Procedure** :
  1. Secure the fiber sample in the testing machine’s grips. The stripper blade cuts into the fiber coating until it just touches the outer diameter of the silica glass cladding (standard cladding diameter is typically 125\ \mu\text{m} ).
  2. Drive the testing machine at a specified constant rate (usually 500\ \text{mm/min} ) to smoothly pull along the fiber’s axis.
  3. The sensor records the force curve required during the stripping process in real-time, exporting the peak stripping force F\_{\text{peak}} and average stripping force F\_{\text{avg}} (unit: \text{N} ).

#### 2. Adhesion Test After Environmental Aging (Durability Evaluation)

- To assess the fiber’s resistance to delamination under long-term high humidity or harsh environments, fiber samples are typically placed in a 85/85 damp heat environment ( 85^\circ\text{C} / 85\%\ \text{RH} ) or immersed in hot water (e.g., for 30 days). After removal, the mechanical stripping force is measured again to evaluate the attenuation rate of interfacial adhesion.

* * *

### II. Adhesion Properties and Typical Applications of Different Coating Materials

The differences in optical fiber coating materials determine the magnitude of their physical and chemical bonding force with the glass surface:

#### 1. Acrylate Coating

Acrylate is the most commonly used dual-layer coating material for conventional optical fibers. The inner coating is softer and acts as a buffer, while the outer coating is harder and provides protection. The stripping force is designed to be within a moderate range (typically specified between 1.0\ \text{N} \sim 8.9\ \text{N} ), ensuring it doesn’t peel off during normal use while still allowing for easy mechanical stripping by engineers using fiber strippers.

A typical acrylate-coated fiber product is the [OFSCN® G.652D Optical Fiber](https://www.ofscn.org/optical-fibers/g-652-d.html):

 ![OFSCN® G.652D Optical Fiber](https://forum.ofscn.net/uploads/default/original/1X/b9e7425657de6a7b2f925b3028f3e886b0414767.jpeg)

#### 2. Polyimide Coating

Polyimide forms a strong chemical bond with the silica glass surface, resulting in extremely high adhesion. It is very difficult to strip completely with mechanical strippers and typically requires specialized thermal strippers (to soften by heating) or concentrated sulfuric acid chemical solvents for removal. This high adhesion prevents the fiber from delaminating in high-temperature and high-pressure environments.

A typical polyimide-coated fiber product is the [OFSCN® 300℃ SM Polyimide Optical Fiber](https://www.ofscn.org/optical-fibers/polyimide-coated-sm-300.html):

 ![OFSCN® 300℃ SM Polyimide Optical Fiber](https://forum.ofscn.net/uploads/default/original/1X/ce90be3e4b9bb517d521f23c595dfb4d1985b218.jpeg)

#### 3. Metal/Gold Coating

Metal coatings form a solid metal-glass interface bond with the glass cladding interface, offering excellent adhesion and resistance to environmental corrosion. This makes them suitable for extreme environments with ultra-high temperatures and pressures.

A typical gold-coated fiber product is the [OFSCN® Gold-coated Optical Fiber](https://www.ofscn.org/optical-fibers/gold-coated.html):

 ![OFSCN® Gold-coated Optical Fiber](https://forum.ofscn.net/uploads/default/original/1X/a0527f8c12cba5c5a4c64951106d0779161ec84a.jpeg)