Descripción
MasterSeal CR 125 es un sellador de poliuretano autonivelante listo para su uso en juntas horizontales en ambientes industriales.
Usos:
- Concreto
- Horizontal
- Interior o exterior
- Sobre nivel del terreno
- Pistas de aeropuertos
- Carreteras y puentes
- Pisos industrials
- Vías de acceso y muelles de carga
Características / Beneficios
- Resistente a la intemperie, con desempeño duradero.
- Resistente al combustible para aviones y al ataque químico.
- La excepcional capacidad de alargamiento tolera el movimiento de juntas.
- No requiere mezclado.
- No requiere imprimante en la mayoría de aplicaciones, facilitando la aplicación y acelerando los trabajos en obra.
- Resistente a rayos ultravioleta (UV).
Presentación
- Cubetas de 18.93 L (5 gal)
- Tambores de 189 L
Color
Negro
Almacenamiento
Almacene en sus recipientes sin abrir en un área fresca, seca y alejado de la luz solar directa. El almacenamiento a temperaturas elevadas reducirá su vida útil.
Vida Útil
- Cubeta de 18.93 L: 12 meses cuando se almacena de forma adecuada.
- Tambores de 189 L: 6 meses cuando se almacena de forma adecuada.
Contenido COV
1.07 lbs/gal menos agua y exento de disolventes.
Forma de aplicación
Preparación de la junta
- El producto puede usarse en juntas diseñadas de conformidad con la Guía Profesional del Instituto SWR de selladores.
- En condiciones ideales, la profundidad del sellador debe ser mitad del ancho de la junta. La profundidad
del sello de junta (medido desde el centro) debe ser entre un máximo de 13 mm (0.5 in) de profundidad
y un mínimo de 6 mm (0.25 in). - En juntas profundas, la profundidad del sellador debe controlarse a través del uso de soporte de junta de espuma de celda cerrada o suave MasterSeal® 921. Cuando la profundidad de la junta no permita el uso de soporte de junta, debe usarse una cinta antiadherente (de poliuretano) para evitar la adherencia en 3 puntos.
- Para mantener la profundidad recomendada del sellado, instale el soporte comprimiéndolo y torciéndolo en el canal de la junta sin estirarlo longitudinalmente. El soporte de celda cerrada debe ser unos 3 mm (1/8 in) mayor en diámetro que el nacho de la junta para que haya compresión.
Los soportes suaves deben ser aproximadamente 25% mayor en diámetro que el ancho de la junta.
El sellador no se adhiere al mismo y no se requiere cinta antiadherente. No aplique imprimante ni perfore el soporte de junta.
Datos Técnicos
MasterSeal® CR 125 es un poliuretano curado en húmedo modificado con betumen.
Aprobaciones
- ASTM C 920 Tipo S, Grado P, uso T, M, NT, Clase 25
- Especificación Federal TT-S-00230C, Tipo I, Clase A
- Cuerpo de Ingenieros CRD-C-541, Tipo I, Clase A.
Preparación de superficie
- Los sustratos deben estar estructuralmente sanos, totalmente curados, secos, limpios y sin suciedad, partículas sueltas, aceite, grasa, asfalto, alquitrán, pintura, cera, oxidación, agentes desmoldantes, de curado y de impermeabilización, residuos de membranas y de selladores.
- Retire todo material suelto de las juntas utilizando un cepillo de alambre. Mediante abrasión con arena
prepare las superficies que estuvieron en contacto con agentes desmoldantes. El concreto recién
colocado debe estar perfectamente curado. La lechada debe quitarse por abrasión. - Para juntas previamente selladas, retire todo el material de sellado viejo utilizando medios mecánicos. Si las superficies de la junta han absorbido aceites, debe retirarse suficiente concreto para asegurar una superficie limpia.
Aplicación de imprimante
- La mayoría de las aplicaciones no requieren de imprimante. Sin embargo, las juntas que estén sujetas a inmersión frecuente de agua deben imprimarse con MasterSeal® P 173. Para otras superficies que no sean de concreto, haga una prueba de aplicación para verificar la adherencia.
- Aplique el imprimante formando una capa delgada uniforme, evitando aplicar en exceso.
- Tome cuidado para no aplicar el imprimante más allá de las caras de la junta. Para minimizar la contaminación de las superficies adyacentes, coloque una cinta adhesiva protectora antes de preparar y quítela antes que el sellador haya comenzado a engrosar y curar.
- Deje que seque de 15 a 30 minutos antes de aplicar el sellador (el imprimante debe estar seco al tacto).
El imprimado y sellado deben realizarse el mismo día.
Aplicación
- Rellene las juntas vertiendo el sellador del pico de un recipiente.
- Rellene las juntas desde el fondo, evitando el puenteo de la junta para evitar la formación de
diversos vacíos de aire. El sellador se autonivelará formando una junta limpia.
Tiempo de curado
El curado de MasterSeal CR 125 varía con la temperatura y humedad. Los siguientes tiempos de curado asumen
una temperatura de 24°C (75°F) y una humedad relativa de 50% y una junta de 13 mm de ancho por 6 mm de
profundidad (½ in por ¼ in).
- Secado al tacto: Dentro de las primeras 24 horas.
- Curado completo: Aproximadamente 1 semana.
- Para aplicaciones en inmersión en agua: 21 días.
Limpieza
Lave las herramientas inmediatamente después de usarlas con MasterSeal 990 o con xileno. Siga las
precauciones necesarias cuando esté manejando estos disolventes. El material curado debe removerse
mecánicamente.
Para mejor desempeño
- No permita que MasterSeal® CR 125 sin curar entre en contacto con materiales a base de alcohol o con
sus solventes. - No aplique selladores de poliuretano en las inmediaciones de selladores de silicona sin curar o
de MasterSeal® NP 150 sin curar. - MasterSeal CR® 125 no ha sido previsto para uso en aplicaciones bajo inmersión continua en agua. Entre
en contacto con su representante de ventas BASF para obtener recomendaciones. - Los soportes de junta, rellenos y separadores deben instalarse con firmeza para evitar la pérdida
del sellado a través del fondo de la junta - Las juntas que puedan estar sujetas a punción requieren un material de respaldo de mayor densidad
o más rígido. Los rellenos de junta de corcho o de fibra de caña sin impregnar son adecuados. Separe
el material del sellador con una cinta antiadherente (cinta de polietileno) - Las temperaturas o humedad altas pueden causar que el producto sin curar forme burbujas.
- El sellador puede formar burbujas si los sustratos no están secos o si el material se aplica a demasiada
profundidad. - No use otros selladores, arena o materiales que no se puedan comprimir como soporte en la base de
la junta. - No aplique si se espera que llueva antes que el sellador desarrolle una película sustancial
- Para juntas con anchos mayores a 38 mm (11/” in) use MasterSeal SL 2.
- La aplicación adecuada es responsabilidad del usuario. Las visitas de campo del personal
de BASF tienen como único propósito el hacer recomendaciones técnicas y no el de supervisar ni
proporcionar control de calidad en la obra.
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