LOS TIPOS DE GRASA MÁS COMUNES I
Grasas cálcicas (Ca)
Las grasas cálcicas tienen una estructura suave, de tipo mantecoso, y una buena estabilidad mecánica. No se disuelven en agua y son normalmente estables con 1-3 de agua.
En otras condiciones el jabón se separa del aceite de manera que la grasa pierde su consistencia normal y pasa de semilíquida a líquida. Por eso no debe utilizarse en mecanismos cuya temperatura sea mayor a 60° C. Las grasas cálcicas con aditivos de jabón de plomo se recomiendan en instalaciones expuestas al agua a temperaturas de hasta 60°C.
Algunas grasas de jabón calcio-plomo también ofrecen buena protección contra el agua salada, y por ello se utilizan en ambientes marinos. No obstante, existen otras grasas cálcicas estabilizadas por otros medios distintos del agua; éstas se pueden emplear a temperaturas de hasta 120°C; por ejemplo, grasas cálcicas compuestas.
Grasas sódicas (Na)
Las grasas sódicas se pueden emplear en una mayor gama de temperaturas que las cálcicas. Tienen buenas propiedades de adherencia y obturación. Las grasas sódicas proporcionan buena protección contra la oxidación, ya que absorben el agua, aunque su poder lubricante decrece considerablemente por ello. En la actualidad se utilizan grasas sintéticas para alta temperatura del tipo sodio, capaces de soportar temperaturas de hasta 120°C.
Grasas líticas (Li)
Las grasas líticas tienen normalmente una estructura parecida a las cálcicas; suaves y mantecosas. Tienen también las propiedades positivas de las cálcicas y sódicas, pero no las negativas. Su capacidad de adherencia a las superficies metálicas es buena. Su estabilidad a alta temperatura es excelente, y la mayoría de las grasas líticas se pueden utilizar en una gama de temperaturas más amplia que las sódicas. Las grasas líticas son muy poco solubles en agua; las que contienen adición de jabón de plomo, lubrican relativamente, aunque estén mezcladas con mucha agua. No obstante, cuando esto sucede, están de alguna manera emulsionadas, por lo que en estas condiciones sólo se deberían utilizar si la temperatura es demasiado alta para grasas de jabón de calcio-plomo, esto es, 60°e.
Un técnico en gestión lubricantes le asesora en la elección del producto.
SISTEMAS DE ENGRASE Y LUBRICACION LOS PROFESIONALES DEL ENGRASE
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