About Sealant Flexibility
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Vacuum Leak Sealants
Seal leaks on vacuum systems and components.
Epoxy resin sealants, also known as Torr Seals, form a rigid bond.
Bentonite/petrolatum sealants, also known as Apiezon sealants, form a flexible, non-hardening seal that’s easy to remove and reposition.
Container | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Size | Type | Begins to Harden | Reaches Full Strength | Vacuum Rating, torr | Maximum Vacuum @ Temperature | Tensile Strength, psi  | Hardness | Mix Ratio | Temp. Range, °F | For Joining | Color | Each | |
Epoxy Resin | |||||||||||||
| 1.7 fl. oz. | Cartridge | 60 min. | 3 days | Ultra High | 10 -9 torr @ 72° F | 5,000 | Extra Hard (Durometer 75D) | 2:1 | -45° to 245° | Metal, Glass, Masonry | Off-White | 0000000 | 0000000 |
| 4.2 fl. oz. | Tube | 60 min. | 3 days | Ultra High | 10 -9 torr @ 72° F | 5,000 | Extra Hard (Durometer 75D) | 2:1 | -45° to 245° | Metal, Glass, Masonry | Off-White | 0000000 | 000000 |
Bentonite/Petrolatum | |||||||||||||
| 2.2 lbs. | Can | 5 min. | 1 hrs. | High | 10 -4 torr @ 72° F | Not Rated | Not Rated | __ | 15° to 85° | Metal, Plastic, Glass | Gray | 0000000 | 000000 |
Container | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Size, fl. oz. | Type | Begins to Harden | Reaches Full Strength | Vacuum Rating, torr | Maximum Vacuum @ Temperature | Tensile Strength, psi | Hardness | Mix Ratio | Temp. Range, °F | For Joining | Color | Each | |
Epoxy Resin | |||||||||||||
| 1.7 | Cartridge | 60 min. | 3 days | Ultra High | 10 -9 torr @ 72° F | 5,000 | Extra Hard (Durometer 75D) | 2:1 | -45° to 245° | Metal, Glass, Masonry | Off-White | 0000000 | 0000000 |
| Loading Method | For Cartridge Size | Material | Each | |
| Cartridge | 1.7 oz. | Plastic | 0000000 | 0000000 |
Low-Outgassing Silicone Sealants
Tested to meet ASTM E595, a standard used by NASA, these sealants fill joints and seams while releasing almost no volatile emissions that could damage sensitive electronics, even in a vacuum. Made of silicone, they’re RTV (room-temperature vulcanizing), so they’ll fully harden at room temperature.
Elongation indicates flexibility—the higher the value is, the more a sealant can stretch.
Sealants that begin to harden in 26 min. are less likely to trap contaminants than those that take longer to harden.
Container | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Size, fl. oz. | Type | Begins to Harden | Reaches Full Strength | Elongation | Joint Compression/ Expansion Tolerance | Tensile Strength, psi | Hardness | Temp. Range, °F | Specifications Met | For Joining | Color | Each | |
| 5 | Tube | 26 min. | 3 days | 610% | Not Rated | 925 | Durometer 41A (Medium Soft) | -45° to 390° | ASTM E595 | Metal Plastic Rubber Glass Masonry | Clear | 0000000 | 0000000 |
| 5.8 | Cartridge | 150 min. | 7 days | 420% | -25% to 25% | 600 | Durometer 36A (Medium Soft) | -200° to 500° | ASTM E595 | Metal Plastic Rubber Composites Glass | White | 0000000 | 000000 |