MG Chemicals 8800-375ML Black Flexible Urethane Potting Compound, 375 mL Kit
MG Chemicals 8800-375ML Black Flexible Urethane Potting Compound, 375 mL Kit
MG Chemicals 8800-375ML is a black, two-part flexible polyurethane potting compound supplied as a 375 mL kit containing Part A and Part B. Its low mixed viscosity helps it flow around intricate electronic assemblies, while its flexible cure provides physical protection with minimal stress on circuit boards and surface-mounted devices. Strong moisture resistance makes it a candidate for harsh environments, particularly saltwater exposure and marine electronics.
Key Features
- Flexible polyurethane resin maintains flexibility at low temperatures.
- Low mixed viscosity helps fill spaces around components and complex geometries.
- Designed to minimize stress on circuit boards and surface-mounted devices.
- Strong adhesion to metals, composites, glass, ceramics and many plastics; evaluate your actual substrates.
- Superior moisture resistance for evaluated marine and underwater potting applications.
- Electrically insulating material with excellent dielectric properties.
- 24-hour room-temperature cure and a 2:1 mix ratio by volume.
Technical Specifications
| Property | Specification |
|---|---|
| Part number | 8800-375ML |
| Manufacturer | MG Chemicals |
| Chemistry | Two-part flexible polyurethane |
| Color | Black |
| Package | 375 mL total, two-bottle kit containing Part A and Part B |
| Mix ratio, A:B by volume | 2:1 |
| Mix ratio, A:B by weight | 7:4, as specified in the manufacturer’s technical data sheet |
| Typical mixed viscosity at 25°C | 375 cP |
| Typical mixed density | 1.1 g/mL |
| Working time | Manufacturer product page: 5–7 minutes. Technical data sheet: 10 minutes based on a 100 g sample; varies with volume and geometry. Confirm the applicable instructions before production. |
| Room-temperature cure | 24 hours |
| Constant service temperature | −50 to +120°C / −58 to +248°F |
Technical values are manufacturer-published typical data, not a guarantee of finished-assembly performance. Working time depends on batch size, temperature and geometry. Prepare the enclosure and dispensing tools before mixing, and follow the applicable technical data sheet and safety data sheets.
Best Uses / Applications
- Potting and encapsulating electronic assemblies where a flexible rather than rigid material is desired.
- Marine electronics and assemblies exposed to saltwater, after application-specific qualification.
- Evaluation for underwater sensors and other underwater potted assemblies.
- Outdoor electronics requiring moisture resistance and low-temperature flexibility.
- Intricate circuit boards and surface-mounted assemblies where minimizing encapsulant stress is important.
Selection Comparison
| Consideration | 8800 Flexible Urethane | Other Potting Approaches |
|---|---|---|
| Cured character | Flexible polyurethane | Rigid epoxies and rigid urethanes offer different mechanical behavior; compare application requirements |
| Component visibility | Black, opaque material | Clear silicone compounds allow visual component identification |
| Environment | Manufacturer highlights moisture resistance, marine exposure and underwater potting | Check each alternative’s environmental limits rather than assuming equivalent protection |
| Mixing | 2:1 by volume or 7:4 by weight | Ratios differ by product; never transfer one system’s instructions to another |
| Process planning | Short working time; prepare before mixing | Longer-working-time formulations may suit more complex filling operations |
Mixing & Application Planning
Measure Part A and Part B using the correct ratio for your measurement method: 2:1 by volume or 7:4 by weight. Mix and apply according to the manufacturer’s instructions. Use manageable batches and validate air removal, wetting, adhesion and cure on representative assemblies. Low viscosity assists flow but does not guarantee void-free encapsulation. Flexible potting minimizes stress; it does not guarantee that components cannot be damaged.
Frequently Asked Questions
What comes in the 8800-375ML kit?
The listing is for a 375 mL two-bottle kit containing Part A and Part B of the black flexible urethane system.
Is the mixing ratio the same by weight and volume?
No. Use 2:1 A:B by volume or 7:4 A:B by weight. Do not use the volume ratio when weighing components.
How much working time is available?
The manufacturer’s product page lists 5–7 minutes, while its technical data sheet lists 10 minutes for a 100 g sample and notes variation with volume and geometry. Confirm the applicable instructions and validate your process; do not assume a full kit will provide the same working time as a small test batch.
How long does it take to cure?
The manufacturer lists a 24-hour room-temperature cure. Follow the applicable instructions and verify cure before putting the assembly into service.
Can it be used for marine or underwater potting?
MG Chemicals identifies 8800 as an underwater potting compound and highlights saltwater and marine applications. Qualify the complete assembly, including adhesion, seals, exposure conditions and operating temperature; potting alone does not establish a waterproof rating.
Does it stay flexible in cold conditions?
The manufacturer states that it maintains excellent low-temperature flexibility and specifies a constant service range of −50 to +120°C. Evaluate the complete assembly over its intended operating conditions.
Will it bond to my enclosure?
8800 adheres strongly to a wide variety of metals, composites, glass, ceramics and many plastics. Adhesion is substrate- and preparation-dependent, so test the actual enclosure material and follow surface-preparation guidance.
Can I inspect the components through cured 8800?
No. It is a black potting compound. If see-through component identification is required, compare clear encapsulating materials.
Related Products & Resources
Compare encapsulating and potting compounds, explore the MG Chemicals range, or visit our Adhesives, Dispensing & UV Cure Systems resource hub.
