Proportioning

[svp07 14]

Can anyone direct me to some information about proportioning chemicals? i am a little confused...

If it says 4-1, h2o-chem annd then further dilute 25-1 is that 100-1 proportioning?

What are some of you using to measure dry chemicals by weight...like when it says add 1 pound of whatever. Thanks for the help.

[Aplus 525]

I use a scale to measure dry chemicals by weight.

[John T 744]

I also carry a scale in my trailer.

Also going from 4-1 to 25-1 that just means to add more water to dilute to get to 25-1 which is the same as 100-4 etc. But the smallest common denominator if I remember correctly is 25-1. Which is also the same as 12.5-.5 etc.etc.etc.

[svp07 14]

Thanks John,

I was refering to a solution that said to pre-dilute to 4-1 and then proportion 25-1 through an injector.....does that make it a 100 to 1 dilution. I was just trying to figure this out to make small batches for pump sprayer application.

can anyone recommend a scale to use and a place of purchase?

Thanks,

Steve

[Jack Kramer 15]

Last year I bought a scale to weight HD-80 and Oxcilic acid. I carefully weighted 8 ounces of each as well as several other dry chemicals. To my surprise each of the dry chemicals weighed ended up being 1 Cup. I returned the scale and now use a measuring cup.

[Paul B. 523]

Many chemicals, such as HD-80, EFC-38 and Citralic (fortunately)

are same in weight as in liquid volume (1 dry oz = 1 liquid oz).

However this is not always the case and you should always weigh

your first batch after opening your container.

I find the Sunbeam SP5 digital scale serves a nice double function

for weighing letters and packages (0.1 oz. increments, up to 5 lbs.)

along with an occasional chemical weigh-in. The SP5, or a similar model

can be found at an Office Max, Office Depot, or Staples for about $30.