Question 1

How long do these last?

Accepted Answer

It depends on the situation.  In a sealed container with no extra source of moisture, indefinitely.  In my incredibly damp garage about 30 minutes.  They can be "reactivated" by baking in the oven and I have been experimenting with using low power settings in the microwave with some success.  (full power causes them to "Snap, crackle, and pop).  I also bought some of the little humidity indicator cards so I can monitor the humidity in my containers.

Question 2

When you try to reactivate by placing them in oven or microwave do the little  packets they are store in burn/melt?

Accepted Answer

We even tested our silica gel packets 300F for 4 hours.in the oven and there were no problems. However we recommend baking in the oven for 0.5-2 hours at 200-240F.  You can also microwave for 7-12 minutes in DEFROST mode.  
* Start with the least amount of time and increase the time as needed.
* Many microwaves do not let you choose time for Defrost mode. Instead, they want you to enter the weight and the microwaves automatically calculate the time for you based on the weight.  You can enter several weights and choose the weight that gives you the closest time to 7 minutes.
* Reactivation time varies depending on the types of packets, saturation level of beads, and types of microwave.
 (NOTE)  This reactivation method does not apply to aiwa packets.

Question 3

Are these Made in the USA?

Accepted Answer

What you see in the picture is what you get.  There is no address for a manufacturer or statement of origin.  If it was made in the USA, my guess would be that it would say so.  The seller - Silicagel Factory seems to be a Chinese company and they also sell on Alibaba.

Question 4

How do i know when to recharge?

Accepted Answer

5 gram pack of 50 paper packets that you inquire about only contain white beads.  Therefore, you can't visually see the color change when the beads are saturated.  You can use weight method for paper packets.  If the packets weigh around 7-8 gram, it is time to recharge them.   Thank you.

ASIN	B00DYKTS9C
Batteries Required?	No
Batteries included?	No
Best Sellers Rank	49,596 in Business, Industry & Science ( See Top 100 in Business, Industry & Science ) 103 in Desiccants 129 in Lab Evaporation & Drying Equipment
Colour	White
Customer Reviews	4.7 4.7 out of 5 stars (12,505)
Date First Available	10 Feb. 2014
Guaranteed software updates until	unknown
Item Package Quantity	1
Item Weight	5 g
Item model number	FBA_B00DYKTS9C
Material	PET (Polyethylene Terephthalate)
Part number	FBA_B00DYKTS9C
Size	50 Pack(5 Gram Paper)
Special Features	Automatic Moisture Removal, Portable

5 Gram Pack of 50 "Dry & Dry" Premium Pure & Safe Silica Gel Desiccant Packets - Rechargeable Paper(FDA Compliant)

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Specifications

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