JC207HD Self-Extinguishing Borated Polyethylene is used for neutron shielding applications where flame resistance is necessary or desired for the installation. Its hydrogen content is slightly lower than that of JCPE5 Borated Polyethylene.
Self-extinguishing materials are desirable for use in any location requiring neutron shielding where there is an issue with fire loading and a need to reduce the amount of material contributing to the overall amount of combustible materials. ASTM test D-635 (Flammability of Self-Support-ing Plastics) shows JC207HD to be self-extinguishing. ASTM Test D-2863 gives a Limiting Oxygen Index of 30.2. In addition to the fire resistance, JC207HD produces negligible smoke when exposed to flame.
JC207HD contains high hydrogen content to provide good characteristics for the attenuation of fast neutrons and contains 0.9% by weight boron (4.7% for JC207HD5). It has relative high density of 1.7 g/cc (106 lbs/cu ft), which improves its gamma shielding characteristics compared to other polyethylene based shields.
JC207HD has numerous applications in nuclear facilities including shielding hatches, ducts, sumps, stairwells and is available in slabs, 1-inch thick, in sizes up to 96” x 48”. It is easily shaped and cut using ordinary woodworking and metalworking tools. Custom machining is available to your specifications.
Features at a glance
- Self-extinguishing polyethylene shielding
- JC207HD contains ~1% boron and 6% hydrogen
- JC207HD5 contains ~5% boron and 6.6% hydrogen
|Hydrogen atom density / cm³:||6.10 x 10²²||6.35 x 10²²|
|Hydrogen weight percent:||6.01%||6.65%|
|Natural isotope distribution:||99.98 % ¹H||99.98% ¹H|
|Boron atom density / cm³:||8.14 x 10²⁰||4.19 x 10²¹|
|Boron natural isotope distribution:||19.6 %¹⁰B & 80.4 %11¹¹B||19.6 %¹⁰B & 80.4 %11¹¹B|
|Boron weight percent:||0.86%||4.71%|
|Total Density:||1.70 g/cm3 (106 lbs./ft³)||1.60 g/cm³ (99.8lbs/ft³)|
|Macroscopic thermal neutron cross section:||0.64 (cm⁻¹)||3.19 (cm⁻¹)|
|Gamma resistance:||5 x 10⁸ rad||5 x 10⁸ rad|
|Neutron resistance:||2.5×10¹⁷ n/cm²||2.5×10¹⁷ n/cm²|
|State:||Sheets, Bricks||Sheets, bricks|
|Odor:||No odor||No odor|
|Recommended Temperature Limit:||200°F (93.3°C)||200°F (93.3°C)|
|Chemical Name & Synonyms:||Borated Polyethylene||Borated Polyethylene|
|Trade Name & Synonyms:||JC207HD||JC207HD5|
|Formula:||Mixture (CH2)n, B||Mixture (CH2)n, B|
|Solubility in Water:||Negligible||Negligible|