Standard

Classification

Characteristic

Example

Absorbent
Method

Physical Dry

Absorb moisture by using the large surface
   that has a tiny hole

Silica Ball, Activated carbon,
Silica gel, mineral

Chemical Dry

Absorb moisture by chemically responding
   with moisture

Phosphorous pentoxide dark
sulfuric acid, and etc.

What to dry

How to dry gas

Equip liquid or gas to the specific
   equipment and let the target gas go
   through the equipment for drying

How to dry liquid

Method of evaporation by mixing
   dry agent to the solution

How to dry Solid

Use equipment such as desiccator, infrared
   ray dry, and etc

Acid Level

Acid desiccant

Absorb flammable gas with acid desiccant

Dark sulfuric acid, phosphorous
pentoxide, and etc.

Flammable
desiccant

Absorb acid gas with flammable desiccant

Soda lime

Neutral desiccant

Normally absorb vapor

Silica Gel

Relative Humidity

Unit

Low Moist Type

High Moist Type

Type 1
(Container)

Type 2
(Small bag that has
moisture permeability)

Type 1

Type 2

Absorbent at relative
humidity of 20%

Above 8.0

Above 3.0

Absorbent at relative
humidity of 50%

Above 20.0

Above 10.0

Absorbent at relative
humidity of 90%

Above 30.0

Above 50.0

Percentage of
water content

Above 2.0

Above 2.5

Above 2.0

Above 2.5

pH Value

min

4~8

Small bag dropping
strength

Number of damages:
Below 1

Number of damages:
Below 1