Shanghai Brand Industrial X-ray film is an ideal film for DNT flow detecting of welded parts, casting, pipeline, materials etc...The thickness of our film substrate is 0. 175mm blue polyester imported from foreign supplier. Photographic emulsion is coated on both sides of the substrate. Our film is in medium speed, high contrast and fine graininess. Exposed film can be processed either by auto machine or by manually operated. Its Photo Specification: Fog Density: Less than or equal to 0. 12 Average Slope: Mare than or equal to 4. 0 Sensitivity: More than or equal to 250 Max. Density: More than or equal to 4. 0 Emulsion Fusion point: More than 70 degree Our films are guaranteed for 2 years after production and under recommended storage condition. You inquiring is welcomed