Is this safe to use with a copper core heatsink? The rest of the heatsink(s) is aluminum however the contact for paste is copper.

No it's not safe. This is known to slowly corrode copper. If it's nickel plated copper that's fine, but i would not use it anywhere near aluminum. It;s been generally thought that it would be safe with copper, but look on overclock.net, and you'll find plenty of people that say that it does corrode copper http://www.overclock.net/t/1313179/official-delidded-club-guide/14340#post_19550310it is safe on nickel plated copper like the cpu's Integrated heat spreader and nickel plated waterblocks.

Can it be used under a aluminium block?

No! I used this only for the space between my Die and the tim that is nickel coated copper. It's been in my computer for about 2 years and I have not seen any problems. Only use if you plan on delidding. I do not reccomend for CPU to cooler assembly.

Does anyone use liquid electric tape or something for safety, do you leave it on at the end after all done with putting in liquid metal and ihs?

You never want to use any tape where you have thermal conduction. just leave it on all upu need is a thin layer and it will stay put. Had it on for 2+yrs with no issues.

What is the best for 4770K DELID ? Liquid Ultra or PRO ?

Liquid Ultra. Also I would follow this method: https://youtu.be/1BG-Y4XEFjU it is also good for GPU waterblock installations. https://youtu.be/JWEZAt8upVE

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🔥 Keep Your Cool with Liquid Ultra!

METAL MASTERY - Crafted 100% from metal for superior thermal conductivity.
DURABLE RELIABLE - Heat resistant formula designed to withstand extreme conditions.
UNLEASH PERFORMANCE - Experience a serious drop in temperatures for your CPU!
COMPACT CONVENIENT - Lightweight tube for easy application and storage.
PRECISION APPLICATION - Pasty consistency ensures even coverage and maximum efficiency.

The Liquid Ultra Thermal Paste Compound is a high-performance thermal interface material designed specifically for CPU processor cooling. Made entirely from metal, this paste ensures optimal heat transfer, significantly lowering temperatures for enhanced performance. Its water-resistant properties and easy-to-apply tube make it a must-have for tech enthusiasts looking to maintain their systems at peak efficiency.

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Brand	Electronics More
Specific Uses For Product	Computer Processor Cooling
Material	Metal
Compatible Material	Metal
Item Form	Paste
Special Feature	Heat Resistant
Color	Gray
Item Package Quantity	1
Package Information	Tube
Viscosity	Pasty
Water Resistance Level	Water Resistant
Global Trade Identification Number	04260157580152
Manufacturer	Coollaboratory
Item model number	900100264
Item Weight	1.41 ounces
Product Dimensions	4.33 x 0.79 x 0.2 inches
Item Dimensions LxWxH	4.33 x 0.79 x 0.2 inches
ASIN	B0039RY3MM
Is Discontinued By Manufacturer	No
Date First Available	January 7, 2011

Liquid Ultra Thermal Paste Compound Grease CPU Processor Heatsink

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