Juntor Bronze CuSn7Zn3 (Gun bronze)

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Technical specifications.

  •  Bronze CuSn7Zn3. Made in Spain. 46 mm width, 15, 5mm height. case back 44mm with 4 screws.
  •  Bidirectional bezel with 12 clicks.
  •  20 ATM.
  •  Pushed  crown ATM 20. Made in Spain.
  •  Black rubber strap. You can choose another colour you like
  •  316 L SS buckle with EXTático logo.
  •  Sapphire crystal with red anti reflective for both sides.
  •  Luminova handles .
  •  ETA 6498-1. Manual winding movement, Swiss made
  •  3 years warranty 
Price
  • Bronze 1275 euros shipping included.

 

Bronze CuSn7Zn3 

General
Copper Alloy: CuSn7Zn3
Density 8.75e3 – 8.85e3 kg/m^3
CO2 creation * 4.1 – 4.54 kg/kg
Production Energy * 65.2 – 72.1 MJ/kg
Recycle Fraction * 0.3 – 0.4

Composition
Composition (Summary)
Cu/7Sn/3Zn
Base Cu (Copper)
Cu (Copper) 87 %
Sn (Tin) 7 %
Zn (Zinc) 3 %

Mechanical
Bulk Modulus * 85.3 – 88.6 GPa
Compressive Strength 130 – 160 MPa
Elongation 5 – 15 %
Elastic Limit 130 – 160 MPa
Endurance Limit * 130 – 159 MPa
Fracture Toughness * 61.3 – 67.9 MPa.m^1/2
Hardness – Vickers 150 HV
Loss Coefficient * 156e-6 – 237e-6
Modulus of Rupture 130 – 160 MPa
Poisson’s Ratio 0.34 – 0.35
Shape Factor 28
Shear Modulus * 29.2 – 30.3 GPa
Tensile Strength 250 – 340 MPa
Young’s Modulus 79 – 82 GPa
Thermal
Maximum Service Temperature 180 – 190 °C
Melting Point 917 – 1042 °C
Minimum Service Temperature -63 – -48 °C
Specific Heat * 382.8 – 383.9 J/kg.K
Thermal Conductivity * 60 – 65 W/m.K
Thermal Expansion 17.5 – 18.5 μstrain/°C

Electrical
Resistivity 13.2 – 17.4 μohm.cm

Optical
Transparency Opaque

Durability
Flammability Very Good
Fresh Water Very Good
Organic Solvents Very Good
Oxidation at 500C Average
Sea Water Very Good
Strong Acid Poor
Strong Alkalis Very Good
UV Very Good
Wear Very Good
Weak Acid Good
Weak Alkalis Very Good

Typical Uses
Pumps; valves; housings to resist corrosion; low-stress

3 Comments

  1. I want to buy this model

    Reply
    • Hi sin,
      I can book one in the new series I start to manufacture in september, if you want.
      Regards
      Gilberto

      Reply
  2. Do you have any watches available for sale? Does the price include TVA? Can you ship to Australia? Thanks and regards.

    Reply

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