bids are invited for duck cotton kersey black 1500mm - duck cotton kersey black 1500mm width fire retardant, flame spread class water resistant, rating 50 to 60, spry test is 390:1975 ( proban ) astm-d:1230:94note:cloth test report certificate to be produced for qa / qce inspection , lining cotton black - lining cotton black 36 width sweat absorbing , cotton based natural woolen fabric - cotton based natural woolen fabric fur, half white soft 8mm thk x 1500mm width ( mtrs 113.8 ) , leather basin brown / black, - leather basin brown / black, soft unstained 1.2mm thk is:580 ( kgs 32.55 ) , leather cow curried black - leather cow curried black 0.6mm thk is 580 ( kgs 45.5 ) , felt wool rot & moth proof grey - felt wool rot & moth proof grey 10mm thk medium hard is:1719 ( sqmtrs 38.55 ) , sponge rubber yellow 25mm thk - sponge rubber yellow 25mm thk medium hard ( sqmtrs 32.5 ) , sponge rubber black 20mm thk - sponge rubber black 20mm thk medium hard ( sqmtrs 26.3 ) , sponge rubber black 10mmthk - sponge rubber black 10mmthk medium hard ( sqmtrs 26.3 ) , sewing thread black - sewing thread black 200 mtrs coats sun art 3620 , sewing thread black no a8961 - sewing thread black no a8961 tex 60 , sewing cotton tiger - sewing cotton tiger tex 27 / 9 tkt2 , sewing cotton 2mm dia - sewing cotton 2mm dia black is 1726 , buckle brass 13mm - buckle brass 13mm one prong with black colour coating , buckle brass 19mm - buckle brass 19mm one prong with c / plating , buckle brass self locking - buckle brass self locking with brass roller type 13mm width black colour coating , press button - press button set brass 10mm , button coat - button coat plastic black 15mm dia , throat microphone - throat microphone laryngaphone tech specifications:- ( a ) impedience at 1 khz-40ohms+ / - 30% ( b ) efficiency at 300 hzat 3cm / sec=1.5m v to 4.5m v ( c ) efficiency 3000hz at 0.2cm / sec=not less than 1.7m v ( d ) insulation resistance=shall withstand 100vrms for 1 min , ear phone - ear phone electrodynamictech specification: ( a ) impedience at 1 khz=300ohms+ / -25% ( b ) freq response at 300 hz at 3400 / hz=115+ / -10db ( c ) hormonic distortion at 300 hz to 3400hz=shall not exceed 5% ( d ) insulation resistance=not less than 20 meg ohms , shielded cable assy with 5 core - shielded cable assy with 5 core ( 2 core individually shielded ) with 5 pin connector plug as per sample , pvc moulded head phone - pvc moulded head phone ear muff set ( bottom cap, top cover, rubber gasket, rubber bush, with steel screw csk head m3 x 10mm long-4 nos ) to be procured through ex-trade as per drg / smp , valcrow tape - valcrow tape set black 25mm width , lable ( iinen cloth ) - lable ( iinen cloth ) 70mm x 40mm as per sample , aluminium collar - aluminium collar ( clip ) for rf cable 10mm dia x 10mm long , adhesive - adhesive dendrite pc 65 ( ltrs 32.35 ) , potting compound - potting compound ( ltrs 3.2 ) , plastic cover, - plastic cover, 80 microns , silica gel - silica gel pack of 10 gms total quantity : 1