Where hazardous liquids or gases such as acids or alkalis flow in piping, small leaks occur initially.
But if overlooked, they erupt in large quantities and cause big accidents. Early detection is critical point for prevention of leakage accident.
If only critical (tend-to-leak) areas are addressed, many accidents can be prevented at low cost.
Most leaks occur from flanges and valves due to packing fatigue or uneven bolting.
If Acid Band or Alkali Band are pre-wrapped around critical areas, they absorb leaked liquid and gas and change colors to detect the accidents.
So to speak, they are similar to inorganic Litmus test paper.
Acid Band turns from reddish brown to white or yellow when exposed to acidic liquids or gases.
liquid or gas
density
ｐH
reaction time
hydrochloric acid
35%
-
some seconds
10%
-
under one minute
1%
1.2
one hour
sulfuric acid
95%
-
(cloth melt down)
48%
-
some seconds
10%
-
few minutes
1%
1.2
one hour
nitric acid
60%
-
(cloth melt down)
10%
-
30 minutes
1%
1.2
few hours
perchloric acid
60%
-
45minutes
hexafluorosilicic acid
40%
-
some seconds
1%
2.0
30 minutes
oxalic acid
10%
1.1
few minutes
1%
1.5
one hour
phosphoric acid
10%
1.2
10 minutes
1%
1.7
24 houes
citric acid
10%
1.8
12 hours
acetic acid
10%
2.1
24 hours
sulfurous acid gas
-
-
prompt
chromic anhydride
25%
1.6
no color change
Before color change
After color change
Alkali band turns from light green to blue, purple, black, etc. when exposed to alkaline liquids and gases and others.
liquid or gas
density
ｐH
reaction time
sodium hydroxide
1～40%
13.4～
prompt
40～48%
-
(cloth melt down)
ammonia water
1～28%
10～14
prompt
ammonium hydrogen carbonate
3%
8
few minutes
10%
8
prompt
ethylenediamine
10%
12
prompt
diethylene triamine
10%
12
prompt
sodium hypochlorite
6%
13
some seconds
hydrogen peroxide water
3%
5
few minutes
30%
5
prompt
hydrogen sulfide gas
-
-
prompt～few minutes
sodium carbonate
25%
11.5
no color change
sodium hydrogen carbonate
10%
10
no color change
sodium nitrite
40%
9.2
no color change
ammonium sulfate
10%
6.1
no color change
aniline
10%
9
no color change
diethylamine
10%
13
no color change
Dimension
25 mm x 10 m
Component
Polyester fiber, Inorganic pigment
They can be attached easily and firmly.
You can wrap them around even oily and soiled area without any tools as follows:
1, Wrap around at least one time.
2, Cut in needed length with fingers
3, Press the cut edge on wrapping band itself
1
Wrap around at least one time.
2
Tear off with fingers.
3
Press the end of band to itself.
On the other hand, they can be removed if you peel off the cut edge upward and can be reused.
They can be used outdoors because they are resistant to ultraviolet rays and do not discolor when wet.
They adsorb liquid and prevent splattering and dripping.
Even if a leak occurs from the opposite side of observation position, it can be easily detected because whole band changes its color by capillary phenomenon.
