High Temp Poly Substitute | JCS Nuclear Solutions

JC237-0 neutron moderator is a fire and heat resistant field-castable neutron shielding material. It is silicone elastomer-based and has a high hydrogen content. At temperatures up to 400 °F (204.4 °C), it will retain almost 90% of its initial hydrogen for extended periods.

The hydrogen content of JC237-0 is 2/3 of that found in water.

JC237-0 is available in a variety of shapes and sizes. It has a hard rubber-like consistency that will minimize any impact due to secondary missile formation and is self-extinguishing.

The “0” in the product code denotes zero boron added.

Features at a glance

Field-castable multi-part liquid and powder kit
Pre-cast custom shapes in a hard rubber-like elastomer
More than half the hydrogen content of HDPE without the fire and temperature restrictions
Fire and heat-resistant material

Specifications

Composition Data	Important Properties
Hydrogen atom density / cm3:	4.54 x 10²²
Hydrogen weight percent:	4.79%
Hydrogen natural isotope distribution:	99.98 % ¹H
Total Density:	1.59 g/cm³ (99 lbs./ft³)
Radiation Properties
Macroscopic thermal neutron cross section:	0.02 cm⁻¹
Gamma resistance:	1 x 10¹⁰ rad
Neutron resistance:	5 x 10¹⁸ n/cm²
Physical Properties
State:	Liquid/Powder mix or pre-cast solid
Colour:	Dark grey when cast
Odour:	No significant odour
Machinability:	Fair
Hardness:	Shore “A” Durometer Scale = 66
Tensile Strength (ASTM D368):	50 psi (35,155 kg/ m²)
Compressive Strength:	450 psi (316,395 kg/ m²)
Thermal Properties
Recommended Temperature Limit:	204.4°C (400°F)
Heat Capacity:	0.4 cal/g °C
Specific Heat:	950 J/(Kg-K)
Thermal Conductivity:	0.584 W/(m-K)
Cubical Coefficient of Expansion:	3 x 10⁻⁴ in³/in³ °F (5.4 x 10⁻⁴ cm³/cm³ °C)
Linear Coefficient of Expansion:	1 x 10⁻⁴ in/in °F (1.7 x 10⁻⁴ cm/cm °C)
Vapor Pressure (mm Hg):	5
Evaporation Rate (ether=1):	<1
Chemical Properties
Chemical Name & Synonyms:	High Temperature Poly-Substitute
Trade Name & Synonyms:	JC237-0
Chemical Family:	Silicone Monomer
Formula:	Silicone plus hydrogen compounds
Solubility in Water:	<1%