will this compound work on steel machine screws?

It used to aid with conductivity for aluminum tubing and brackets used in ham radio antennas, since it contains zinc. Not sure if it works with steel, maybe use anti-seize, which contains copper, for steel ?

How is this product better or different from dielectric grease? Is it suitable for use on automobile connectors in the engine bay?

Dieledtric grease is non electrical transmitting. It helps dissipate heat evenly on a flat surface usually. The Penetrox A is made for electrical connections and for anti oxidation on aluminum parts. I use the Penetrox A for ham radio antenna assembly use. I started using Jet Lube SS-30 pure copper anti seize lubricant for electrical transmission in my antennas. As you know copper is an excellent conductor so it works very well on electrical connections, and antennas have many connections on them. The Penetrox will conduct also but the copper much more so. They both are kind of messy if you have ever used anti seize before, you know what I mean. That is about all I know, I hope I helped you in the answer I gave.

Someone knows where can I found Penetrox E ?

I think you can get it here on Amazon

What is the hmis of product?

The product does not come with the HMIS, however goggle is your friend to find out.

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Burndy P8A Oxide-Inhibiting Joint Compounds PENETROX A, 8 oz Container Size, Squeeze Bottle Container Type

Product ID: 589045331

Details

Brand
Burndy
Item Form
Liquid
Material
Aluminum
Special Feature
Specific Uses For Product
Aluminum to to

⚡UL listed to 600 V

🔧Versatile for Al-Al, Al-Cu, Al-conduit

🛡️Oxide-inhibiting corrosion protection

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Description

⚡ Connect smarter, last longer — don’t let corrosion slow you down!

READY WHEN YOU ARE - Maintains workability under 100°F in dry storage for hassle-free use
CERTIFIED PEACE OF MIND - CSA certified and RoHS compliant for industry-leading safety and environmental standards
SHIELD AGAINST CORROSION - Advanced oxide-inhibiting formula prevents galvanic corrosion and extends joint life
POWER UP YOUR CONNECTIONS - Ensures UL 600 V certification for safe, reliable electrical joints
UNIVERSAL METAL COMPATIBILITY - Perfect for aluminum-to-aluminum, aluminum-to-copper, and conduit applications

Burndy P8A PENETROX A is an 8 oz squeeze bottle of oxide-inhibiting electrical joint compound designed to enhance and protect metal connections, especially aluminum and copper. UL listed to 600 V, CSA certified, and RoHS compliant, it prevents galvanic corrosion and remains workable under 100°F dry storage, making it a trusted choice for professional-grade electrical connections.

Specifications

ASIN	B008KLX2RY
Best Sellers Rank	#118,208 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #1,956 in Lab Supplies
Brand	Burndy
Brand Name	Burndy
Colour	Cream
Compatible Material	Metal
Container Type	Bottle
Country of Publication	USA
Item Form	Liquid
Item Package Quantity	1
Item Weight	395 g
Manufacturer	Kosiy
Manufacturer Part Number	P8A
Material	Aluminum
Material Type	Aluminum
Model	P8A
Other Special Features of the Product	Oxide-Inhibiting
Special Feature	Oxide-Inhibiting
Specific Uses For Product	Aluminum to Aluminum, Aluminum to Conduit, Aluminum to Copper
UPC	729198267278 781810592557
Volume	8 Fluid Ounces
Water Resistance Level	Not Water Resistant

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$177.94

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