Electrophotographic belt and electrophotographic image-forming device

An electrophotographic image forming apparatus comprising:

• an electrophotographic belt, comprising
• at least a base layer, wherein
• the base layer comprises polyether ether ketone and carbon black,
• a content of the carbon black, based on a mass of the base layer, is 19.0 to 30.0 mass %,
• the carbon black comprises
• a first carbon black having a thermal decomposition temperature of less than 700° C. and
• a second carbon black having a thermal decomposition temperature of at least 700° C.,
• in a case where, when a sample cut out from the base layer is heated from 30° C. to 100° C. at a rate of 20° C./min under a nitrogen atmosphere and held at 100° C. for 30 minutes, a mass of the sample is defined as X1, and thereafter, when the sample is cooled from 100° C. to 30° C. at a rate of 20° C./min and further left for 48 hours in an environment at a temperature of 23° C. and a relative humidity of 50% under the atmosphere, a mass of the sample is defined as X2,
• a water content of the base layer, which is calculated by water content of base layer=((X2−X1)/X2)×100, is at least 0.60 mass %, and
• a crystallization temperature on cooling measured in differential scanning calorimetry of the base layer is at least 295.0° C.