5% Borated Polyethylene

JCPE5

JCPE5 is a 5% boron loaded polyethylene neutron shield – HMW grade. Specifically developed for neutron shielding purposes in nuclear installations; its optimal boron content of 5% provides excellent attenuation of thermal neutrons, thus reducing the levels of capture-gamma radiation.

JCPE5 has a high hydrogen content, making it an effective fast neutron shield, slowing down fast neutrons to low energy thermal (slow) neutrons, which are then absorbed by the added boron compound.

JCPE5 5% Borated Polyethylene is typically used in neutron shielding applications where low and intermediate-levels of neutron flux are expected, but elevated temperatures are not. JCPE5 is available in a wide range of form factors including slabs, bricks, cylinders, pellets, and other custom shapes.

It is easily machined using common wood and metal working tools. John Caunt Scientific can not only provide custom machining but can also pour JCPE5 into custom made moulds to provide application specific shielding forms.

  • available as slabs, bricks, pellets, rods and spheres
  • Other dimensions/shapes on request
  • Can be supplied machined to close tolerances
  • Other boron loadings available on request
  • Self-extinguishing version available (see model JC207)

Neutron Shielding
Linac Bunkers
Moderator
Instrument Shielding
Wall Shielding

JCS Borated Polyethylene Neutron Shielding
JCS Borated Polyethylene Neutron Shielding
JCS Borated Polyethylene Neutron Shielding
JCS Borated Polyethylene Neutron Shielding
JCS Borated Polyethylene Neutron Shielding
JCS Borated Polyethylene Neutron Shielding
JCS Borated Polyethylene Neutron Shielding
JCS Borated Polyethylene Neutron Shielding
JCS Borated Polyethylene Neutron Shielding
JCS Borated Polyethylene Neutron Shielding
Properties Test Methods Units Values
Colour White
Average molar mass (average molecular weight) – (1) 10⁶ g/mol 0.5
Density ISO 1183-1 g/cm³ 1.035
Thermal Properties
Melting temperature (DSC, 10°C/min) ISO 11357-1/-3 °C 135
Thermal conductivity at 23°C W/(K.m) ≥0.8
Average coefficient of linear thermal expansion between 23 and 100°C m/(m.K) 135 x 10⁻⁶
Temperature of deflection under load:- method A: 1.8 MPa ISO 75-1/-2 °C 45
Vicat softening temperature – VST/B50 ISO 306 °C 84
Max. allowable service temperature in air: – for short periods (3) °C 120
continuously : for 20,000 h (4) °C 80
Min. service temperature (6)- °C -20
Flammability (7):
“Oxygen Index” ISO 4589-1/-2 % <20
according to UL 94 (6 mm thickness)–
Mechanical Properties at 23°C (7)
Tension test (8):
tensile stress at yield (9) ISO 527-1/-2 MPa 21
tensile strain at yield (9) ISO 527-1/-2 % 6.5
tensile strain at break (9) ISO 527-1/-2 % 7
tensile modulus of elasticity (10) ISO 527-1/-2 MPa 1600
Compression test (11):
– compressive stress at 1 / 2 / 5% nominal strain (10) ISO 604 MPa 14 / 21 / 29
Charpy impact strength – unnotched (12) ISO 179-1/1eU kJ/m² 15
Charpy impact strength – notched ISO 179-1/1eA kJ/m² 5C
Charpy impact strength – notched (double 14° notch) – (15) ISO 11542-2 kJ/m² 8
Ball indentation hardness (16) ISO 2039-1 N/mm² 36
Shore hardness D (15 s) – (16) ISO 2039-2 66
Relative weight loss during a wear test in “sand/water-slurry” ;TIVAR 1000 = 100 ISO 15527 350
Electrical Properties at 23 °C
Electric strength (15) IEC 60243-1 kV/mm
Volume resistivity IEC 60093 Ohm cm >10¹⁴
Surface resistivity IEC 60093 Ohm >10¹²
Relative permittivity εr : – at 100 Hz IEC 60250
at 1 MHz IEC 60250
Dielectric dissipation factor tan δ: – at 100 Hz IEC 60250
at 1 MHz IEC 60250
Comparative tracking index (CTI) IEC 60112
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