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Black refractory paste PRNF Refractaia negra PRNF Refractaia negra PRNF

Black refractory paste PRNF

Black refractory paste with 40% fine chamotte 0-0.5 mm. Designed for artistic ceramics, it is ideal for sculpture.
16,95 € + VAT
16,95 €


Black refractory paste with 40% fine chamotte 0-0.5 mm. Designed for artistic ceramics, it is ideal for sculpture. The high chamotte content gives character to the ceramic piece and provides it with excellent behavior during drying and firing. The intense black color in oxidizing firing of the PRN range is very exclusive and appreciated, making it an ideal means of artistic expression. In a reducing atmosphere, excellent metallic effects of beautiful bluish tones are obtained.
Cooking temperature: 1200-1260ºC
Cake temperature: 1000ºC
Humidity: 21%
Plasticity (IP Atterberg): 22
Calcimetry (CaCO3): 0%
Drying shrinkage: 7.0%
Firing shrinkage (1260ºC): 4.5%
Porosity (water absorption 1260ºC): 9.4%
Dry mechanical strength: 2.0 N/mm2
Fired mechanical resistance (1260ºC): 27.5 N/mm2
Expansion coefficient (at25-500ºC): 55.8x10^-7ºC^-1
Recommendations for use with enamels:
Use zinc-free (Zn) polishes to avoid unexpected reactions such as bubbling or color changes. Other elements that can react are zirconium (Zr) and tin (Sn). We recommend that you consult your usual glaze supplier to ensure correct suitability with this ceramic paste.
Do not use enamels with a low expansion coefficient (at25-300ºC <60X10-7ºC-1). The PRN paste fired at high temperature has a high expansion coefficient in the range of 100 to 200ºC, which causes tensions between the enamel and the support, mainly in pieces enamelled on one side only, which can cause breakage during cooling in the oven or later (for example, by pouring hot water inside the piece). Consult your usual enamel supplier to ensure that you use enamels with a medium-high expansion coefficient (at25-300ºC >60x10-7ºC-1).
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