Hayakawa Rubber Co., Ltd.


Radiation resistant rubber

Radiation resistant rubber

■ Radiation resistant rubber

Research and development on radiation-resistant rubber is conducted in cooperation with the Japan Atomic Energy Agency, an independent administrative corporation (currently a national research and development corporation). Radiation-resistant rubber was developed in joint research for the improvement of radiation resistant rubber employed in rubber shock-absorbing materials and seals used in the high intensity proton accelerator facility (J-PARC). Examples of commercialization of the product are exhibited at the Sixth Industry-Academia-Government Cooperation Conference.

■ Characteristics of radiation-resistant rubber

  • Usable in high-intensity radiation environments.
  • Improved durability of rubber materials allows for reduced material costs.
  • Contributes to a reduction in the volume of radioactive waste materials.
  • Reduces exposure of personnel to radiation during inspection, maintenance, and replacement work.
  • Improves reliability of equipment.
  • A comprehensive product range is available (sheets, packings, seals, etc.)

■ Radiation types and characteristics

●Radiation types and shielding methods

Type Classification
α rays Charged particle radiation High-speed helium nuclei
β rays Charged particle radiation High-speed electron flow
γ and χ rays Electromagnetic radiation Short-wavelength electromagnetic radiation
Neutron rays Non-charged particle radiation Flow of neutrons comprising the atomic nucleus
Radiation types and shielding methods

●Radiation units

Absorbed dose: Gray (Gy)

Indicates the amount of energy absorbed by a substance.
1 Gy indicates absorption of 1 J of energy per kg of a substance.

Dose equivalent: Sievert (Sv)

Indicates the effect of absorbed radiation on the human body.

●Quality factor of each type of radiation

Radiation Quality factor
β rays, γ rays, χ rays 1
Neutron ray 10
α rays 20

■ Radiation resistance of elastomers

Radiation resistance of elastomers

■ Product examples

Flexible container bags
●Flexible container bags

Packings and gaskets
●Packings and gaskets

Pressure-resistant hoses
●Pressure-resistant hoses

Punched gaskets
●Punched gaskets