supply of op roof seal n type roll. size: 8 inch x 20 m of electric locos. make: 3 m /permacel/savvy/johnson & johnson or similar . as per specification: , top roof seal n type roll. size: 8 inch x 20 m of electric locos. make: 3 m /permacel/sav vy/johnson & johnson or similar . as per specification: (1) visual tape free from wrinkle & visual defect (2) dimension: (a) width: 8 (inch) (b) length: 20 mtrs (c)thickness: 0.18 mm-0.30mm (4) tensile stren gth kg (25-30 min.) (5) elongation (%) : 5min. (6) adhesive to steel (g / 2.5 cm): 3000 min. (7) water p ermeability: not more than two drops after two hours. (8) weather resistance to pass 200 hours as per saej 1960in std xenon arc base should pass the test. (9) oil resistance should pass the test(10) alk ali resistance should pass the test (11) mvpt as per ind/me/790 (a): the moisture absorption should n ot be more than 200 g / m square /24 hrs at 40 degree. [ warranty period: 30 months after the date of delivery ] ]