Roof mix

Its easier for me to go to job with SH in tank. 125 gallon tank so it would never be more than a 1/3 full and its never been a problem. BUT. If you were mixing in small containers with small openings that would not be the safe way to mix
 
"Red" said:
I've read that SH has a specific weight (compared to water) for the difference %'s. I still haven't found anything concrete (no pun intended), but this seems to me to be a way to determine what % of SH you're buying.
Click to expand...
I buy bleach in 15 gallon deldrums from a chem company with the weight and % printed on the purchase order 120 lb per deldrum . and 12% is always printed on the label . If a deldrum has been sitting more than 2 weeks the strength has decreased . We have a 900 lb limit before you need a hazmat issue.
 
Diamond Jim said:
I buy bleach in 15 gallon deldrums from a chem company with the weight and % printed on the purchase order 120 lb per deldrum . and 12% is always printed on the label . If a deldrum has been sitting more than 2 weeks the strength has decreased . We have a 900 lb limit before you need a hazmat issue.
Click to expand...

I haven't confirmed this with any legitimate sources yet, but 12.5% should be around 10 lbs per gallon. That drum should be weighing in at around 150 lbs.
 
Russ Johnson said:
You always add chemicals to water. Some chemicals are exothermic, and release heat when water is added, sometimes rapidly and violently, causing gushing and boil overs. It's just a really good habit to adopt.
Click to expand...
It is a good habit, for some kinds of chemicals. However, we have been adding water to sodium hypochlorite for over 20 years, with never any problems of any kind.
 
Russ Johnson said:
You always add chemicals to water. Some chemicals are exothermic, and release heat when water is added, sometimes rapidly and violently, causing gushing and boil overs. It's just a really good habit to adopt.
Click to expand...

john neilson said:
I was getting my SH first then diluting later at the job. I deffenitly will change that bad habit.
Click to expand...
We have been adding water to sodium hypochlorite for over 20 years, with never any problems of any kind.
Russ Johnson is correct, it is always good practice to add some chemicals TO water. However, most roof cleaners I know, including us, have been adding water to sodium hypochlorite for many years.
 
One of the main issues of adding chemicals to water instead of water to chemicals is safety .Adding water to chemicals splashes the chems back at you. Adding chems to water splashes water back at you. Chemistry 101....
 
"Red" said:
I haven't confirmed this with any legitimate sources yet, but 12.5% should be around 10 lbs per gallon. That drum should be weighing in at around 150 lbs.[/

Ben buying 120 pound 15 gallon deldrums for 20 years 8 pounds a gallon . I can't go over 900 lbs so I buy 6 to 7 at a time . They will not sell me 8. Because of the 900 limit is strictly enforced.
Click to expand...
 
Russ Johnson said:
You always add chemicals to water. Some chemicals are exothermic, and release heat when water is added, sometimes rapidly and violently, causing gushing and boil overs. It's just a really good habit to adopt.
Click to expand...

Diamond Jim said:
One of the main issues of adding chemicals to water instead of water to chemicals is safety .Adding water to chemicals splashes the chems back at you. Adding chems to water splashes water back at you. Chemistry 101....
Click to expand...
Absolutely correct!
Our dedicated to roof cleaning trucks have dual 300 gallon tanks, one for tile roofs, and one for shingle roofs.
We will fill one with 80 to 100 gallons of sodium hypochlorite, and one with 110 to 130 gallons of SH, for the tile roofs.
Then, we fill them up the rest of the way, with water. But we use garden hoses in our tanks, stuck down into the chemical, so splashing water/chemical is never a problem.
 
You must log in or register to reply here.
Back
Top