What is Self-Amalgamating Tape?

Halfords Self Amalgamating Tape (FIXG359)

SELF AMALGAMATING TAPE - 19mm x 10m Self amalgamating tape Approved (B.T. spec. M128) with strong elastic qualities. Suitable for insulation,

Black 19 mm x 10 m Self Amalgamating Tape for Waterproofing Connections

Orange Red Mil Spec Tape - 1 x 36' 20 Mil - Tommy Tape Self-Fusing Silicone

How to use self-amalgamating tape

Scotch® Self-Fusing Silicone Rubber Electrical Tape, 70, sky blue grey, 12 mil (0.3 mm), 1 in x 30 ft (25.4 mm x 9.1 m)

73700 - Cantech

Amalgamating, self-fusing tape [Handyman Demos]

Self Amalgamating Tape - 25mm x 10m

Custom High-Voltage Self-fusing Rubber Tape Wholesale - YGTAPE Adhesive