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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100 PCS Raspberry Pi 4 Heatsink Kit with Conductive Adhesive Tape, Aluminum Heat Sink Cooler and Copper Heatsink for Raspberry Pi B B+ 2/3/4

100 PCS Raspberry Pi 4 Heatsink Kit with Conductive Adhesive Tape, Aluminum Heat Sink Cooler and Copper Heatsink for Raspberry Pi B B+ 2/3/4

Product ID: 375956362

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Details

Brand
Pastall
Cooler Heatsink Material
aluminum
Product Dimensions
14L x 14W x 7H
Cooler Heatsink Compatibility
Aluminum
Item Weight
0.14 Kilograms

⚡High Conductivity

🔧8 Sizes

🧊100 PCS

Description

🔥 Cool down your tech game with style!

DIVERSE SIZES - Includes 8 different sizes for all your cooling needs.
DURABLE ADHESIVE - High-performance thermal adhesive for long-lasting use.
MULTI USE APPLICATION - Perfect for CPUs, GPUs, and DIY electronics!
VERSATILE COMPATIBILITY - Fits Raspberry Pi 2, 3, 4, and more!
ULTIMATE COOLING SOLUTION - Keep your Raspberry Pi running cool and efficient!

The Pastall 100 PCS Raspberry Pi 4 Heatsink Kit is a comprehensive cooling solution featuring 80 aluminum and 20 copper heatsinks in 8 different sizes, designed for optimal heat dissipation. With high-performance thermal adhesive, this kit ensures durability and compatibility with various Raspberry Pi models and other electronic components.

Specifications

Brand	Pastall
Cooler Heatsink Material	aluminum,copper
Product Dimensions	14L x 14W x 7H Millimeters
Cooler Heatsink Compatibility	Aluminum
Item Weight	0.14 Kilograms
Mounting Type	Adhesive
Manufacturer	Pastall
UPC	779283239918
Model	PT2019080503
Item model number	PT2019080503
Batteries Included	No
Batteries Required	No
Material	Aluminium, Copper
Country of Origin	USA
Item Weight	136 g

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