Can the heatsinks help cool my raspberry pi 4 from 100°f down to something like 80°f?

You must mean Celsius, not Fahrenheit. And it entirely depends on the situation, your ambient temperature, and how hard the Pi is being used. The only real way to know for your situation is to try it. I'd recommend removing (scraping off) the thermal pad and just using a small amount of thermal paste (about 1/4 of a green pea). I've had no issues with the heatsink sliding off, even mounted vertically.

how strong is the adhesive tape? with heat, will it stay for a long time?

I haven't had one fail yet. Taking them off one raspberry pi 3b+ I was worried it would damage the chip. So the adhesive is pretty strong.

Does this heat sink work on google fiber multi-gig router sfp on 10g port? it is very hot to touch (fiber to 10g ethernet port)

A heat sink should work but I would make sure the case has proper air slow. Get all wires ried for proper.

How hard is it to remove these if needed to?

Unsure. Shouldn't be too hard. Could tear it off pretty cleanly with fingers and use a solvent (isopropyl alcohol or acetone maybe) to squeaky clean the residual adhesive. It's not a super adhesive but fairly tacky. I pulled it off cleanly to rearrange it without problem but with heat and time that could change.

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Pastall PT2019080503 100PCS Aluminum & Copper Heatsink Kit for Raspberry Pi B, B+, 2, 3, 4

Product ID: 382703442

Details

Brand
Pastall
Cooler heat-sink material
Aluminum and
Product dimensions
14L x 14W x 7H
Cooler heat-sink compatibility
[Partial] Pi A
Item weight
0.14 Kilograms

🔥High Conductivity

🔧8 Sizes

🧊100 PCS

€ 48.41

Duties & taxes included

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Sold byAmazon CroatiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

❄️ Chill Out with the Ultimate Heatsink Kit!

DIVERSE SIZES - Includes 80 aluminum and 20 copper heatsinks in 8 different sizes for all your cooling needs.
DURABLE ADHESIVE - Equipped with high-performance thermal conductive adhesive for long-lasting heat dissipation.
DIY ENTHUSIASTS DREAM - Perfect for cooling development boards, laptops, CPUs, GPUs, and more!
VERSATILE COMPATIBILITY - Designed to fit Raspberry Pi models A, B, B+, 2, 3, 4, and 5, plus other electronics.
ULTIMATE COOLING SOLUTION - Keep your Raspberry Pi and other devices cool with this comprehensive 100 PCS heatsink kit!

The Pastall 100 PCS Heatsink Kit offers a complete cooling solution for Raspberry Pi and other electronic devices. With 80 aluminum and 20 copper heatsinks in 8 different sizes, this kit ensures optimal heat dissipation. The included high-performance thermal conductive adhesive guarantees durability and effectiveness, making it a must-have for DIY enthusiasts and tech professionals alike.

Specifications

ASIN	B082RWXFR2
Best Sellers Rank	#9 in Heatsinks
Brand	Pastall
Brand Name	Pastall
Cooler Heatsink Compatibility	Raspberry Pi, Single-board Computers, Electronic Components
Cooler Heatsink Material	Copper
Customer Reviews	4.6 out of 5 stars 785 Reviews
Item Dimensions L x W x H	0.55"L x 0.55"W x 0.27"H
Item Weight	0.14 Kilograms
Manufacturer	Pastall
Model	PT2019080503
Mounting Type	Panel Mount
Part Number	PT2019080503
Product Dimensions	0.55"L x 0.55"W x 0.27"H
UPC	779283239918

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Fantastic and great service. Shipping was faster than expected.

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The MOLLE sheath is of exceptional quality. Very happy with my purchase.

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