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SH Shelf-life

PaulS · Mar 25, 2010

Blake, sorry for the bold.

Sodium Hypochlorite Degradation – Average Manufacturer @ 70 Degrees F

Time of Manufacture - 12.5 Trade Percent
2 Days Later – 12.43 Trade Percent
7 Days Later – 12.25 Trade Percent
14 Days Later – 12.01 Trade Percent
21 Days Later – 11.78 Trade Percent
28 Days Later – 11.55 Trade Percent
35 Days Later – 11.34 Trade Percent

Sodium Hypochlorite Degradation – Average Manufacturer @ 80 Degrees F

Time of Manufacture - 12.5 Trade Percent
2 Days Later – 12.34 Trade Percent
7 Days Later – 11.96 Trade Percent
14 Days Later – 11.47 Trade Percent
21 Days Later – 11.01 Trade Percent
28 Days Later – 10.59 Trade Percent
35 Days Later – 10.21 Trade Percent

PrestigePressure · Guest

Remember too that keeping it out of direct sunlight will help it last longer also. UV rays degrade the strength.

RoofKleen · Guest

Comes in 55 gallon drums if you are storing it I suggest you use the dark blue drums and store in a cool place in the warmer months. this will make it last longer. In hot weather and with lots of sunlight it will go down much quicker than the shelf life chart. Also don't let metal come in contact with it as this robs the strength.

Guest

Thanks a lot guys! I had searched everywhere online and everything I found seemed to differ. I did discover though that if the manufacterer filters the sh, it will last longer than infiltered.

Roof Cleaning North Jersey(908)674-3392 · Guest

How about SH stored outside over the winter. Just bought some from a pool supplier and thought it was kind of week. Would the cold weather have an affect? Looks like higher temps are the problem.

andy hinson · Mar 28, 2010

I think you can see a color difference detween strong SHC and the weaker.
The stronger being very yellow.

Guest

Mine comes in 53, not 55

joshuabcrutcher · Guest

Houston Texas Roof Cleaning (281) 853-5753 wrote:

Mine comes in 53, not 55

Mine is 53 too... Where do you get yours?

I have had sit over the winter and had success. Not recommended, but had it to use!!! biggrin

Baltimore MD Roof Cleaning 410-482-4367 · guest

In the winter the cold might have stopped the free chlorine loss temporarily. In 60-80deg F after the first 35-40 days it starts to rapidly break down stabilizing at about 3-4%.

Absolutely Brilliant · Guest

I know that Chlorine is not quite the same as SH, but that is what I've been using and it seems to have been working for me. I will definitely be looking into SH, but haven't seen that forum yet.

Anyway, for the time being, what is the shelf life of...

-straight chlorine
-chlorine diluted with water at 50/50 mix
-other chlorine/water ratios

I'm not sure how to interpret degradation. If someone could put it in terms of how many days it's good for, that would be great.

(Note. Chlorine is stored in trailer not exposed to sunlight. It's also been a cool 60-70 degrees recently.)

Thanks guys.

Roger · Premium Member Roof Cleaning Institute of America

I have a roof to clean [1200 sq ft asphalt shingles] but my left over SH is about 5 months old.
It's been stored inside, in the black drum from supplier, and it foams like a rabid dog when rubbed between fingers.
Wondering if I mixed it stronger, say 50/50 or even more if it will work, been doing some softwashing with it and it's seems to be working.
Buying fresh this time of year is not an option with a 156 gal. minimum and snow forecast for later next week !!

Plan is to do it tommorow, temp. 63 degrees and sunny.

Any advice greatly appreciated !

Matthew · Guest

Absolutely Brilliant wrote:

I know that Chlorine is not quite the same as SH, but that is what I've been using and it seems to have been working for me. <snip>

Actually unless you are referring to chlorine gas, "chlorine" is a generic term used for many chemicals in which "chlorine" is a part.

Sodium Hypoclorite is a solution containing between 10-15% "chlorine"

There is also Sodium Dichlorite and Calcium Hypoclorite which are used by some roof cleaners. These also contain high available chlorine amounts.

Just thought I'd clarify.

-- Edited by Matthew on Sunday 24th of October 2010 06:27:07 PM

Patrick Carder · Premium Member Roof Cleaning Institute of America

Thank you very much. Now that is the way to answer a question

Fara · Guest

Blake,

How are you man? To answer the question the reason that your drums are shortfilled is because you used to buy from Univar,

edited in error, nothing changed (sorry)

-- Edited by Washed-up on Friday 31st of December 2010 01:35:53 AM

The Roof Cleaning Institute Of America Training & Certification Forum "Find A Certified Roof Cleaner Directory"

The Roof Cleaning Institute Of America Training & Certification Forum
"Find A Certified Roof Cleaner Directory"