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We report on the fabrication and use of deuterated polyethylene (dPE) as acoating material for ultra-cold neutron (UCN) storage and transport. The Fermipotential has been determined to be 214~neV and the wall loss coefficient$\eta$ is 1.3$\cdot$10$^4$ per wall collision. The coating technique allows fora wide range of applications and new possibilities in this field of physics. Inparticular, flexible and quasi-massless UCN guides with slit-less shutters andslit-less UCN storage volumes become possible. These properties enable the usein next-generation measurements of the electric dipole moment of the neutron.

Deuterated polyethylene coatings for ultra-cold neutron applications