Film VK-3 is a phenol-rubber film adhesive made from an alcohol solution of phenol-formaldehyde varnish FL-5111 and a rubber mixture solution based on synthetic and natural rubber in solvent (product 4). Film VK-3A is a phenol-rubber film adhesive made from an alcohol solution of phenol-formaldehyde varnish FL-5111 and a rubber mixture solution based on synthetic rubber in solvent (product 4A).