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MG Chemicals 8800 - Black Flexible Urethane

Black Flexible Urethane 8800 is a black, 2-part, flexible polyurethane resin. It has a low mixed viscosity and maintains excellent flexibility at low temperatures. In addition, this flexible urethane adheres strongly to a wide variety of substrates, including metals, composites, glass, ceramics, and many plastics. It is a cost-effective flexible potting option that provides exceptional physical protection and creates minimum stress on circuit boards and surface-mounted devices. It offers superior moisture resistance and is an ideal choice for harsh environments, especially saltwater exposure and marine applications.

Product Type: 2K (2 component) Sealant, Encapsulant, Potting Compound

Compatible Substrates & Surfaces: Ceramic, Glass, Metal, Plastics, Wood

Chemical Family: Polyurethanes (PU)

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Knowde Enhanced TDS

Identification & Functionality

Chemical Family

Features & Benefits

Features & Benefits
  • 2:1 mix ratio
  • Quick working time
  • 24 hour cure at room temperature
  • Constant service temperature of -50 to 120 °C
  • Excellent dielectric properties
  • Ideal underwater potting compound
Recommended Preparation
Clean the substrate with Isopropyl Alcohol, MG #824, so the surface is free of oils, dust, and other residues.
Available Packaging
Cat. No. Packaging Net Vol. Net Wt.
8800-375ML 2 Bottle kit 375 mL 418 g
8800-2.55L 3 Can kit 2.55 L 2.84 kg
8800-10.8L 3 Can kit 10.8 L 12.0 kg
8800-60L 3 Pail kit 60 L 67.0 kg

Applications & Uses

Compatible Substrates & Surfaces

Properties

Typical Properties
ValueUnitsTest Method / Conditions
Mix Ratio2:1Volume
Mix Ratio7:4Weight
Working Time *10minute
Cured Properties
ValueUnitsTest Method / Conditions
Breakdown Voltage46200V
CTE (After Tg)221ppm/˚C
CTE (Prior Tg)86ppm/˚C
Dielectric Strength370V/mil
Glass Transition Temperature (Tg)11°C
Hardness A74
Intermittent Temperature130˚C
Lap Shear (Aluminum)3.1N/mm2
Lap Shear (Stainless Steel)4.4N/mm2
Resistivity8.4 x 10¹²Ω·cm
Service Temperature Range-50 to120˚C
Tensile Strength4.5N/mm2
Thermal Conductivity (at 25˚C)0.3W/(m·K)
Uncured Properties
ValueUnitsTest Method / Conditions
Mixed Density1.1g/mL
Viscosity (at 25˚C) ⁽ᵃ⁾300cP
Viscosity (at 25˚C) ⁽ᵇ⁾640cP
Water Absorption

Approximate sample size: 12.8 mm width, 12.5 mm thickness, and 4.8 g. Cured 1 hour @ 65 ˚C.

  1 Week 2 Weeks 4 Weeks
Water 0.02% 0.2% 0.6%
Salt Water 10% 0.08% 0.3% 0.8%
Note
*Based on 100 g sample. Varies by volume and geometry.
Cure Instructions

Allow to cure at room temperature for 24 hours, or cure in an oven at one of these time/temperature options:

Temperature 65 °C 80 °C
Time 30 min 25 min

Moisture contamination with polyurethanes can create large bubbles on the surface and a lumpy appearance. For consistent curing results, ensure that the resin (part A) is dry before use and the mixture is kept dry during cure. If moisture contamination of part A is suspected, follow the steps below:

  1. Pre-heat part A at 65 °C for 2 hours. Mix the heated resin with the appropriate amount of hardener (do not allow the resin to cool as this may create condensation that wets the resin).
  2. Mix the 2 components together and cure in an enclosure that has a constant stream of nitrogen gas flowing through to keep the environment dry.

Regulatory & Compliance

Certifications & Compliance

Technical Details & Test Data

Mixing
  1. (Optional) Pre-heat part A to improve surface quality.
  2. Scrape settled material free from the bottom and sides of the part A container; stir the contents until homogenous.
  3. Measure 2 parts by volume of the pre-stirred part A, and pour into the mixing container. Ensure all contents are transferred by scraping the container.
  4. Measure 1 part by volume of the part B, and pour into the mixing container. Ensure all contents are transferred by scraping the container
  5. Thoroughly mix parts A and B together.
  6. (Optional) Put in a vacuum chamber at 25 inHg.
  7. Pour the mixture into a container holding the components to be protected.
  8. Blanket both parts with nitrogen if the material is not used up to prevent moisture.
  9. Close the part A and B containers tightly between uses.

Mixing >500 g at a time decreases working life and can lead to a flash cure. Limit the size of hand-mixed batches. For large production volumes, contact MG Chemicals Technical Support for assistance. 

Viscosity vs. Temperature

MG Chemicals 8800 - Black Flexible Urethane - Viscosity Vs. Temperature

Packaging & Availability

Packaging Type

Storage & Handling

Shelf Life
1.5 Years
Storage and Handling
Store between 16 and 30 ˚C in a dry area, away from sunlight (see SDS). Minimize the time that the container is kept opened and purge with nitrogen before closing if the material is not used up at once.