SHF1 versus SHF2  jackets for marine cable applications




The general composition ratios for SHF1 such compounds are as follows:
   
**Polymer Base (Polyolefins):** 40-60%

  - Polyethylene (PE) (C₂H₄)n
  - Polypropylene (PP) (C₃H₆)n
  - Ethylene-vinyl acetate (EVA) (C₂H₄)m(C₄H₆O₂)n

**Flame Retardants:** 30-50%

  - Aluminum Trihydrate (ATH) Al(OH)₃
  - Magnesium Hydroxide (MDH) Mg(OH)₂

**Plasticizers:** 5-15%

  - Improve flexibility and ease of processing.

**Stabilizers:** 1-3%

  - Enhance heat and UV resistance.

**Other Additives:** 1-5%

  - Color pigments
  - Antioxidants
  - Processing aids




The general composition ratios for SHF2 such compounds are as follows:

**Polymer Base (Polyolefins):** 50-60%

  - Cross-linked Polyethylene (XLPE) (C₂H₄)n , or EPR (Ethylene Propylene Rubber)  Ethylene (C₂H₄)& Propylene (C₃H₆)
  - Ethylene-vinyl acetate (EVA) (C₂H₄)m(C₄H₆O₂)n

**Flame Retardants:** 30-40%

  - Aluminum Trihydrate (ATH) Al(OH)₃
  - Magnesium Hydroxide (MDH) Mg(OH)₂

**Plasticizers:** 5-10%

  - Improve flexibility and ease of processing.

**Stabilizers:** 1-3%

  - Enhance heat and UV resistance.

**Other Additives:** 1-5%

  - Color pigments
  - Antioxidants
  - Processing aids


When we analyze SHF1 and SHF2 materials in terms of temperature performance:

**SHF1 Material:**

  - Operates within a temperature range of -40°C to +70°C.

  - Suitable for applications requiring moderate thermal endurance.

**SHF2 Material:**

  - Operates within a temperature range of -40°C to +90°C
.
  - Designed for applications demanding higher thermal resistance and stability.

When comparing the physical strength of SHF-1 and SHF-2 materials:

**SHF1 Material:**

  - Tear resistance is approximately between 4 N/mm and 7 N/mm.

  - Due to its non-cross-linked structure, SHF1 is more prone to cracking in environments with:
    - Deep bends or small bending radii.
    - Significant temperature fluctuations.

  - This makes SHFf1 less suitable for applications requiring high mechanical flexibility or durability in extreme conditions.

**SHF2 Material:**

  - Tear resistance is higher compared to SHF1 due to its cross-linked structure. Tear resistance can reach up to 7.5 N/mm, and in some cases, formulations allow for tear resistance up to 10 N/mm.
   
- SHF2 materials are more advantageous in environments with:
    - Greater temperature fluctuations.
    - Lower bending radii or more demanding mechanical conditions.

  - These properties make SHF2 the preferred choice for more challenging applications requiring higher mechanical and thermal performance.
   
The other differences between SHF1 and SHF2 are as shown in the table below.



Tacettin İKİZ - 17.11.2024

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