METRETHANE™ 4717

SELF-HEALING, CROSSLINKED URETHANE GEL FOR CONNECTOR POTTING APPLICATIONS

PRODUCT DESCRIPTION
PROTAVIC Metrethane TM 4717 is a part of a new class of PROTAVIC flexible urethane elastomers specifically designed for demanding electronic applications. Metrethane 4717 is a two-component, low viscosity, 1:1 mix ratio self-healing, cross-linked polyurethane gel that has been specifically designed for potting cable connectors where excellent resistance to saltwater and fuel oils is needed. When cured, Metrethane 4717 becomes a soft self-healing gel, designed for use where embedded connector circuitry must be checked visually and with test probes. Metrethane 4717 also provides a strain free shock absorbing cushion for delicate parts over a wide temperature range.

TYPICAL PROPERTIES
Should not be used for specification purposes

Composition Urethane resin
Color Amber, gelatinous
Mixed Viscosity 850 cps
Component Viscosity Brookfield #3 spindle (25˚ C), centipoises

 

Product Base Activator
4717 150-250 750-1000


Specific Gravity

Product Base Activator
4717 0.98 0.96

 

Flash Point, Activator, ºC >400º
Flash Point, Base, ºC >250º
Working Life, 100 grams 0.5 hours
Shelf Life 6 months
Mix ratio, parts by weight 98:100
Mix ratio, parts by volume 1:1


Cured Resin Properties

Mechanical
Cone penetration value (1/10mm, ASTM D217) 310
Electrical
Dielectric constant, 1 Khz 4.18
Dissipation Factor, 1 Khz 0.0031
Volume Resitivity, ohm-cm 2.3 X 1011
Insulation Resistance, ohms 5.4 X 1010
Thermal
Operating Temperature ºC -40 to 77


PRODUCT BENEFITS
• Quick cure at common processing temps.
• Low-cost replacement for silicone RTV
• Excellent shock absorbing properties
• Soft, self-healing gel
• Protects components from internal stresses
• Prevents inductance drop after potting

Recommended Time/Temperature Exposure to Achieve Cure in Infrared or Convection Oven

Hours Temp. ºC Temp ºF
48 hrs 25 75
4 hrs 60 140


Preparation of Mixture
For product purchased in two-component kits, mix the entire contents of Metrethane 4717 base and activator (the proper mix ratio is 1:1 by volume) in their original shipping containers to a uniform consistency and color, each time, before dispensing. Take care to incorporate all material adhering to the bottom, sides and corners of the containers. Mechanical mixing of the components for two to three minutes is satisfactory. Measure only the approximate amount that can be applied in 0.5 hours. Blanket containers of unused base and activator with nitrogen prior to re-sealing for storage.

Air Removal
Air entrapment during mixing may be removed in vacuum (5 mm of mercury). The holding container should be no more than one-third full. Allow the mixture to foam and then subside. Maintain the low pressure for several more minutes, at which point most of the large bubbles will have broken.

Application
The material can be poured or extruded in the required thickness after which the parts are set aside to cure using the recommended cure schedules listed on the first page.

STORAGE AND HANDLING
PROTAVIC Metrethane 4717 is a blend of urethane resins and curing agents. Keep stored in the original container at temperatures from 0˚ C to 25˚ C. The product is uniform when packaged. Read material safety data sheets before handling. Keep containers closed when not in use. Effective ventilation is necessary. Goggles, gloves and protective clothing should be worn during handling or exposure. Refer to the product MSDS for more information.

Availability and Order Information
Metrethane 4717 is available as a two-component kit consisting of separate containers of urethane resin and curing agent. Metrethane 4717 is available in pint, quart, two gallon, and ten gallon kits.

Packaging Sizes & Types
Pints, Quarts, Gallons, 5 Gallons, 55 Gallon Drums
Dual cartridges in 50cc, 200ml and 400ml sizes are available for convenient mixing and application of Metrethane 4717.

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Ordering Information
When ordering, specify the name, number, letter designation, color, quantity, container size and packaging form. The order should be placed with the PROTAVIC order entry department. The minimum order size is $ 100.00. Evaluation kits are available for $ 40.00. The $ 40.00 fee will be credited against the first order for the product.