Indium wire is traditionally used for demountable cryogenic seals - its ductility allows it to deform plastically to make a seal between the flanges and it does not embrittle on cooling.

For new students to the cryogenic laboratory there is our step-by-step video that explains how to make Indium Seals.
CMR/In0.7mm-10m
0.7mm diameter Indium (99.99%) wire - 10m length
215.73 215.73000000000002 USD
CMR/In1.6mm-5m
1.6mm diameter indium (99.99%) wire - 5m length
317.52 317.52 USD
CMR/In1mm-10m
1mm diameter Indium (99.99%) wire - 10m length
359.37 359.37 USD
CMR/In2mm-5m
2mm diameter Indium (99.99%) wire - 5m length
595.35 595.35 USD