Name: MOLYKOTE 4
Brand: DDP Specialty Electronic Materials US 9, LLC
SKU: MOLYKOTE 4

Main features

54 to 200 deg C Service Range
3 ohm-cm Volume Resistivity
Flowable Controlled Placement

Product Description

MOLYKOTE® 4 Electrical Insulating Compound is a semi-flowable silicone-based compound used as a lubricant, moisture-resistant seal, and electrical insulating material in connectors, terminals, seals, and mixed metal-to-polymer or metal-to-rubber assemblies. Its documented temperature range is -54°C to 200°C, with ASTM D1478 low-temperature torque data measured at -54°C. Typical electrical results include 338 V/mil dielectric strength at 50 mil thickness, volume resistivity of 4.62 × 1013 ohm-cm at 23°C, and 225 seconds mean arc resistance. The compound can be applied by hand, brush, or wiping; its flow response increases with shear, so automated dispensing and containment should be validated for the intended process.

Key features

Broad documented temperature range: -54°C to 200°C, with low-temperature starting and running torque measured at -54°C.
Electrical insulating properties: Typical dielectric strength of 338 V/mil at 50 mil thickness and volume resistivity above 4 × 1013 ohm-cm at 23°C and 177°C.
Semi-flowable silicone consistency: Unworked penetration of 200–250 mm/10; shear can increase flow into complex geometries.
Moisture and retention data: Waterproof-seal testing passed at 25°C for 24 hours, with 1.1% evaporation and 4.4% bleed after 30 hours at 204°C.
Flexible application methods: Apply by hand, brushing, or wiping; automated dispensing is possible when pump shear and rheology variation are validated.

Applications / Suitable for

Cable connectors, sealed electrical connectors, disconnect junctions, and terminals
Battery terminals and ignition-system sealing and lubrication
Rubber seals and elastomer or polymer O-rings
Metal-on-polymer and metal-on-rubber assembly interfaces
Transportation and industrial moisture-resistant electrical sealing

TDS, SDS & Technical Documents

Technical Specifications

No specifications available.

Additional Information

Electrical insulating lubricant and sealant

MOLYKOTE® 4 Electrical Insulating Compound

A semi-flowable silicone-based compound for lubricating, sealing, and electrically insulating connectors, terminals, elastomer seals, O-rings, and mixed metal-to-polymer or metal-to-rubber interfaces. It combines a -54°C to 200°C documented temperature range with moisture resistance, low evaporation, and condition-specific dielectric, resistivity, and arc-resistance data.

Semi-flowable silicone compound -54°C to 200°C 338 V/mil at 50 mil Moisture resistant Hand, brush, wipe, or validated dispense

MOLYKOTE 4 Electrical Insulating Compound

MOLYKOTE® 4 is supplied as a light-gray to translucent-white, semi-flowable silicone compound.

As-supplied compound properties

Consistency

200–250 mm/10

Typical ASTM D217 unworked penetration; worked penetration after 60 strokes is 310 mm/10 maximum.

Temperature range

-54°C to 200°C

Documented product range; actual behavior remains dependent on the assembly, exposure, material pair, and operating conditions.

High-temperature retention

1.1% evaporation

Typical evaporation after 30 hours at 204°C; bleed under the same duration and temperature is 4.4%.

Property	Typical result	Unit	Method / condition
Color	Light gray to translucent white	—	As supplied
Penetration, unworked	200–250	mm/10	ASTM D217
Penetration, worked 60 strokes	310 max	mm/10	ASTM D217
Worked penetration after thermal exposure	310 max	mm/10	ASTM D217 / AMS8660; 60 strokes after 24 hours at 204°C
Bleed	4.4	%	AMS8660; 30 hours at 204°C
Evaporation	1.1	%	AMS8660; 30 hours at 204°C
Low-temperature starting torque	676	gm-cm	ASTM D1478 at -54°C
Low-temperature running torque	197	gm-cm	ASTM D1478; after 60 minutes at -54°C

Typical values are not specification limits. Temperature, penetration, bleed, evaporation, and torque results are condition-specific and should not be converted into universal equipment-life or dispensing-performance claims.

Electrical and thermal properties

Dielectric strength

338 V/mil

Typical ASTM D149 result for a 50 mil specimen; do not treat as a universal assembly withstand rating.

Volume resistivity

4.62 × 1013 ohm-cm

Typical ASTM D257 result at 23°C and 500 VDC; the reported value at 177°C is 4.11 × 1013 ohm-cm.

Arc resistance

225 seconds

Mean ASTM D495 result under the stated material test; assembly geometry and contamination remain separate considerations.

Property	Typical result	Unit	Method / condition
Dielectric strength	338	V/mil	ASTM D149 / AMS8660; 50 mil specimen
Volume resistivity	4.62 × 1013	ohm-cm	ASTM D257 / AMS8660; 23°C, 500 VDC
Volume resistivity	4.11 × 1013	ohm-cm	ASTM D257 / AMS8660; 177°C, 500 VDC
Arc resistance, mean	225	seconds	ASTM D495 / AMS8660
Dielectric constant	2.80 / 2.89 / 2.80	—	ASTM D150 / AMS8660; 1 kHz / 1 MHz / 10 MHz
Dissipation factor	0.0006 / 0.0013 / 0.0024	—	ASTM D150 / AMS8660; 1 kHz / 1 MHz / 10 MHz
Thermal conductivity	0.235	W/mK	ASTM D5470 at 30°C
Specific heat	1.266 / 1.457 / 1.471	J/(g°C)	ASTM E2716; 50°C / 100°C / 150°C

Additional condition-specific results

Test	Result	Condition / material
Waterproof seal	Pass	AMS8660; 25°C for 24 hours
Insolubility	Pass	AMS8660; 8-day soak
Corrosive effects, metals	Pass; no evidence	AMS8660
Corrosive effects, non-metals	Pass; no evidence	AMS8660
Rubber volume change	-0.7%	ASTM D471 / AMS8660; SRE-NBR-28/PX
Durometer hardness change	0	ASTM D2240; 80 Shore A specimen
Storage stability	Pass	AMS8660; 6 months at 38°C

Electrical, thermal, sealing, and material results apply to the stated specimen, voltage, frequency, temperature, duration, and test method. Confirm performance in the actual connector, terminal, seal, or assembly.

Application process

Apply with controlled shear and containment

MOLYKOTE® 4 may be applied by hand, brushing, or wiping. Its semi-flowable rheology changes under shear, which can improve flow into complex geometries but may also create variation in placement or migration. Automated pumping is possible when the dispensing equipment and final assembly are validated.

Substrate condition: Apply to clean, dry surfaces. The supplier reports adhesion to most dry metals, elastomers, polymers, and ceramics; verify the exact grade and surface condition.

Placement method: Hand, brush, or wipe the compound into the connector, terminal, seal, or assembly interface in the amount needed for the application.

Rheology control: Shear can increase flow. Use mechanical sealing or isolation when the assembly cannot tolerate rheology variation, migration, or uncontrolled spreading.

Stage 1

Clean and dry

Remove contamination that could interfere with adhesion, sealing, or electrical-interface evaluation, and ensure the application surface is dry.

Stage 2

Apply and distribute

Apply by hand, brush, or wiping and distribute the compound through the required interface without obscuring required contact areas or assembly features.

Stage 3

Validate automated dispensing

Where pumps or automated equipment are used, validate shear exposure, delivered amount, flow after dispensing, containment, and repeatability in the customer's process.

Stage 4

Respect finishing boundaries

Do not apply silicone compound to surfaces that must later be painted or coated. Isolate treated areas from finishing operations.

Storage and handling: Store in the original unopened container. The documented usable life is 60 months from the date of production. Review the current safety data and container label before handling, and keep the material away from incompatible strong oxidizing agents.

Applications

Electrical sealing and lubrication applications

The compound is used where a semi-flowable silicone material can lubricate assembly interfaces, repel moisture, and provide bulk electrical-insulating properties. Selection should account for contact design, material grade, electrical requirements, temperature, shear history, containment, and any later painting or coating operation.

Sealed electrical connector and disconnect junction insulating compound placement around the sealing interface without obscuring electrical contacts.

Connectors and junctions

Applications include cable connectors, sealed electrical connectors, disconnect junctions, and terminals where moisture resistance and semi-flowable placement are appropriate.

Battery terminal and ignition-system electrical connection prepared for controlled moisture-resistant silicone compound application.

Battery terminals and ignition systems

Used as a lubricant and moisture-resistant seal around battery terminals and ignition-system electrical interfaces, subject to the connection design and required contact behavior.

Elastomer O-rings, rubber seals, polymer components, and metal mating parts arranged for controlled silicone compound application during assembly.

Seals, O-rings, and mixed-material assembly

Documented uses include rubber seals, elastomer and polymer O-rings, and metal-on-polymer or metal-on-rubber assembly. Verify the exact elastomer or polymer grade and exposure conditions.

Next steps

Evaluate MOLYKOTE® 4 for your electrical sealing or assembly interface

Krayden can help review connector geometry, electrical requirements, substrate and seal materials, temperature, moisture exposure, application quantity, shear from dispensing equipment, migration controls, and finishing constraints. Contact us to discuss product fit, sample needs, or an application-specific validation plan.

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