3M AC-730
Harmonization Code : 3506.91.90.99 | Prepared glues and other prepared adhesives, not elsewhere specified or included; products suitable for use as glues or adhesives, put up for retail sale as glues or adhesives, not exceeding a net weight of 1 kg ; Adhesives based on polymers of headings 3901 to 3913 or on rubber; Other ; Other
Main features
- Non Chromated Corrosion Inhibition
- Flowable And Thixotropic Options
- Selectable Application Life Grades
Product Description
3M Aerospace Sealant AC-730 is a two-part, non-chromated, corrosion-inhibiting polysulfide sealant family for aircraft faying surfaces and joints. Class B grades are thixotropic pastes for extrusion, injection, or spatula placement, while Class C grades are flowable materials for fay-surface application. Both classes use a 100:10 base-to-accelerator mix ratio by weight. Multiple grade schedules let users select an application-life window for the assembly process. After cure, the sealant provides low-temperature flexibility and service capability from -54 to 121 deg C.
Key features
- Non Chromated Corrosion Inhibition: The polysulfide system supports protected aircraft sealing without chromate inhibitor.
- Class B And C Options: Thixotropic and flowable forms address different joint and faying-surface processes.
- Selectable Application Life: Multiple grade schedules support short or extended assembly windows.
Applications
Aircraft faying-surface and joint sealing using the class and grade matched to the application method.
Technical Specifications
General Properties
Other Properties
Additional Information
As-supplied / before-processing properties
Class B and Class C values are separated to preserve their different application forms.
| Property | Value | Unit | Method / condition |
|---|---|---|---|
| Mix ratio by weight | 100:10 | base:accelerator | Class B and Class C systems |
| Class B form | Thixotropic paste | - | Extrusion, injection, or spatula application |
| Class B base viscosity | 9500 to 16000 | poise | Brookfield RVT, spindle 7, 2 rpm, 25 deg C |
| Class B nonvolatile content | 98 | % | Typical |
| Class C form | Flowable | - | Fay-surface application |
| Class C base viscosity | 2000 to 4000 | poise | Brookfield RVT, spindle 7, 2 rpm, 25 deg C |
| Class C nonvolatile content | 90 | % | Typical |
After-processing / final-state properties
Final-state values retain their Class B or Class C test context.
| Property | Value | Unit | Method / condition |
|---|---|---|---|
| Class B specific gravity | 1.52 | - | Cured 14 days at 25 deg C and 50% relative humidity |
| Class C specific gravity | 1.5 | - | Cured 14 days at 25 deg C and 50% relative humidity |
| Class B hardness | 50 | Shore A | Cured |
| Low-temperature flexibility | No checking or adhesion loss | - | At -54 deg C |
| Service temperature range | -54 to 121 | deg C | Cured sealant |
| Short-duration temperature range | -54 to 182 | deg C | Cured sealant |
