Permatex Ultra Black Hi-Temp RTV Silicone Gasket Maker
About this item
Since every manufacturer can use whatever color they want to create their flavor of gasket material. RTV or Room Temperature Vulcanization sealants come in many types, colors, flavors, and work to seal for many different occasions. Also remember that each manufacturer may utilize the same color for different means. Black sealant is very commonly used in the manufacture of sealants. This just adds more to the confusion.
Not that I have empirical evidence of such, but I believe Permatex is most likely the preeminent maker of RTV gasket maker. They have a whole list of other products as well, but the sealants they make do work pretty well. I'll use their colors scheme to describe the differences and when they should be used. Ultimately, though, it comes down to reading the package as to if the product you are looking at is right for your needs.
Permatex has several different types of sealants. Most of which are RTV, but some specify use in anaerobic situations where there isn't any air to do the curing. I will try to break out the different types of sealants and how they are utilized:
Anaerobic (color unknown) - Used where no air will be present after being applied. This product would probably work well for under water situations, such as boat jet drive, or as a temporary fix to replace an o-ring.
- The Right Stuff (Black) - This product is for general use and can be utilized almost anywhere and in any kind of situation. It boasts a quick turnaround so you can get your equipment back into service quickly. Many OEM manufacturers use this product on their assembly lines. It is good from -75°F to 450°F (-59°C to 232°C) continuous, 500°F (260°C) intermittent; resists ATF, coolant, oil and other shop fluids, and is sensor-safe.
- The Right Stuff 1-Minute (Grey) - Specifically designed for high torque situations. Permatex boasts a "torque and go" attitude with this product. This product is specified by many non-US manufacturers. It is good up to 450°F (232°C) continuous; 500°F (260°C) intermittent.
- The Right Stuff (Grey) - Basically the same as the 1-minute type. It just takes a little longer to cure and go back into service.
- Ultra Black Maximum Oil Resistance (Black)) - Used in areas where oil resistance is a must. This would be oil pans or valve cover gaskets. Temperature range -65°F to 500°F (-54°C to 260°C) intermittent.
- Ultra Copper Maximum Temperature (Copper) - As the name implies, to be used where high temps are present. I've used this stuff on my header gaskets at the collector with good results. It helps seal the gasket and helps it last longer as well. This product is good up to 700°F intermittent. It works to seal liquids as well.
- Ultra Grey Rigid High-Torque (Grey) - Eight times more flexible than cork/composite gaskets; three times more oil resistant than conventional silicones. Temperature range -65°F to 500°F (-54°C to 260°C) intermittent. Used where you'd expect to need more flexibility than normal.
- Ultra Blue Multipurpose (Blue) - As the name implies, this is an all purpose gasket material. Temperature range -65°F to 500°F (-54°C to 260°C) intermittent. OEM specified for a lot of different applications.
- Sensor-Safe Blue (Blue) - General use RTV. Will not foul O2 sensors. ature range -65°F to 500°F (-54°C to 260°C) intermittent.
- High-Temp Red (Red) - Universal, but can be used in hi-temp situations. Not as high temp as Ultra Copper. Temperature range -65°F to 650°F (-54°C to 343°C) intermittent.
- Sensor-Safe High-Temp (Color unknown - Assume black) - Same as the High-Temp Red, but is won't foul O2 sensors.
- Water Pump & Thermostat (Color unknown - Assume black) - Specified where high concentrations of water and glycol are present.
- Automatic Transmission (Color unknown - Assume black) - Specified for automatic transmission pan gaskets. Resists tranny fluids.
- Gear Oil (Color unknown - Assume black) - Used on differential housings to seal in gear oil.
This list is not exhaustive. As you can tell, the same colors (well mainly black) is used over and over again for different reasons. You can also see that there is a lot of overlap between the different sealants. One sealant can be used in many different applications. The thing to remember is, some of the sealants work better for certain applications.
Your best bet is to read the package and decide what is going to be best for your particular situation, no matter what brand or color it comes in.
answered Jul 14 '15 at 22:55