Application of A60 fire-resistant cable threading device sealing module

A60 fire-resistant cable penetration sealing modules are key components of fire-resistant partition systems in high-safety environments such as ships, offshore platforms, rail transportation, and nuclear power plants. Their core mission is to prevent the spread of flames, high-temperature smoke, and toxic gases through cable penetrations during a fire, thus buying crucial time for personnel evacuation and firefighting. TST Seal Nico provides a systematic interpretation, covering standard requirements, technical principles, typical structures, application scenarios, and key selection points.

1. 1. Core Definition and Standard Requirements of A60 Fire Rating

✅ International Maritime Organization (IMO)

Fire resistance integrity:
No flame penetration within 60 minutes in the standard fire resistance test (ISO 834 curve, 1000℃ flame);

Thermal insulation:
Average temperature rise on the unexposed side ≤140°C, temperature rise at any point ≤180°C;

Low Smoke & Toxicity:

Smoke density (IMO FTPC Part 2): Optical density ≤ 100;

The concentration of toxic gases (CO, HCN, HCl, etc.) is below the life-threatening threshold (IMO MSC.61(67));

Material non-flammability:
Sealing materials must pass the ISO 1182 non-flammability test, and harmful substances such as asbestos and halogens are prohibited.

📌 Chapter II-2 of the SOLAS Convention mandates that all cables passing through Class A fire-resistant bulkheads must use a certified Class A60 sealing system.

1. 1. Technical Implementation Principle: Triple Protection Mechanism
   2. Intumescent sealing material

At room temperature: a soft elastomer, suitable for cable installation;

When exposed to fire (>200°C): it rapidly expands 5–20 times, filling the gaps between cables and holes to form a dense carbonized layer;

Material type:

Inorganic expansion systems (such as sodium silicate + expanded graphite): environmentally friendly and low-smoke;

Organic expansion systems (such as APP/PER): have high expansion rates, but the toxicity of the smoke needs to be controlled.

1. 2. Rigid fireproof frame

Material: Galvanized steel, stainless steel or composite fireproof board (such as magnesium oxide board);

Function: To provide structural support and prevent deformation and collapse under high temperatures.

1. 3. Modular variable diameter design

Core advantages:

A single module can be adapted to various cable outer diameters (e.g., Φ5–30mm);

Supports adding or removing cables later without requiring a complete replacement;

structure:

[Fireproof Frame] → [Expansion Sealing Module] → [Pressure Bolts] → [Fireproof Sealant]

III. Typical Product Structure and Installation Method

▶ Modular Cable Sealing System (MCT System)

💡 Installation process:

Weld/bolt the frame to the through hole;

Cut the sealing module to cable dimensions;

Insert the cable and tighten the pressure plate;

Apply intumescent fire-retardant sealant to the gaps.

1. 1. Main Application Scenarios

⚠️ Additional requirements for military vessels:

MIL-STD-2031: Fireproof + Watertight + Impact Resistant in One;

STANAG 4549: Protection against NBC poison infiltration.

1. 1. Mainstream Certification and Testing Standards

🔑 Certification marks: Products must have classification society certification (such as DNV, LR, CCS) or third-party laboratory reports (such as Exova, SGS).

1. 1. Key Considerations for Selection

Cable type and quantity:

Power cables vs. signal cables;

Does it contain optical fiber (to avoid compression)?

Environmental conditions:

Does it require watertightness (IP68), airtightness (helium leak detection), or EMC shielding at the same time?

Maintenance requirements:

The modular system supports hot-swapping, which is superior to traditional fireproof putty/fireproof bags.

Environmental compliance:

It must be low smoke halogen-free (LSOH) and compliant with RoHS/REACH.

VII. Typical Suppliers and Products

Roxtec: Multi Dynamic™ A60 system, with a global market share of over 60% in marine applications;

TST SEAL (China): TST-MCT modules, certified by CCS/DNV A60 , are leading in the military/nuclear power fields .

3M: Fire Barrier Sealant, for filling gaps.

The A60-grade fire-resistant cable threading sealing module is not an ordinary sealing material, but a highly reliable system integrating materials science, structural mechanics, and fire safety. Its design must adhere to the following principles:

🔥 The “Three No’s Principle”:

Fireproof (integrity);

Non-heat conductor (insulating);

It does not produce toxins (environmentally friendly).

TST SEAL selection recommendation :
Do not purchase without certification; do not install without test reports.