This material is hard, hard, physiologically non-toxic mass and specific gravity 1.40 g / cm 3. Like all thermoplastics, it hardens with the cold and softens with the heat. For this reason, its mechanical resistance increases even at low temperatures, and its impact resistance decreases. It should be noted that up to 40ºC, the influence of temperature is almost nil. However, when the temperature is maintained between 40ºC and 60ºC, rigid PVC can be used in several applications, always taking into account that the pressures and mechanical loads they support are lower than normal. At temperatures below 0 ° C, the material must be protected against impact.