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Desiccant Calculator

The calculator is designed according to DIN55474;To ensure accurate calculation, please fill in the detailed data requested.

(1)

Package target humidity

%RH

Explanation...

In natural state, humidity changes frequently, while goods normally need to be kept in a stable and relatively low humidity condition in order to be safe storage and transport. So it is necessary to use desiccant for safe humidity control. We call it "target equilibrium humidity". It varies depending on different product.

Categories	Examples	Humidity
Papers	Paintings, antiques, books, fax paper, copy & printing paper etc	55%-60%
Opticals	CCTV cameras, Audio equipment, computers, cameras, lenses, microscopes, telescopes, Video tapes, microfilm, disk drives, slides, CD etc	45%-55%
Precision Materials	Metals, non-metallic , electronics, semiconductors, Crystal, precision measuring tools, optics, lenses, monochromatic, spectrometer, etc	35%-45%
Chemical raw materials	Pharmaceutical raw materials, spices, paint, powder, powder, materials, adhesives etc;Agricultural Research: seeds, pollen, dried flowers	< 35%

* The above data is for reference only. The target equilibrium humidity varies according different product. Please contact our customer service staff for more information and advice.
* This calculation applies only to 20% -60% Target equilibrium humidity packaging technology conditions.

(2)

Packaging ambient temperature

℃

Explanation...

Reference: part of the city monthly average temperature, 2014 (Extract from China Statistical Yearbook 2015 data), the reference data to fill in nearby cities.

City	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Beijing	-0.6	-0.4	10.1	17.1	22.2	25.1	28.1	26.3	21	14	6.4	-0.5
Tianjing	-1.0	1.3	9.7	16.7	22.3	25.1	28	26.2	21.1	14.6	6.8	-1.1
shenyang	-8.5	-5.7	3.7	13.5	17.1	22.2	24.9	24.2	16.7	10.7	1.9	-10.3
Haerbing	-18.3	-15.5	-1.0	10.3	14.3	22.9	23.1	21.9	15.5	6.4	-1.9	-16.9
Shanghai	6.8	6.1	11.5	15.7	21.7	23.3	27.4	26.3	24.2	20.2	14.8	5.7
Nanjing	5.6	4.7	11.8	16.3	22.6	24.6	27.1	25.3	23.2	18.9	12.6	4.6
Hangzhou	7.0	6.0	12.7	17.0	22.5	24.7	28.4	26.7	24.6	20.3	14.1	6.4
Fuzhou	11.8	11.5	14.9	19.2	22.5	26.5	30.1	29.1	28.6	23.3	19.3	12.3
Jinan	2.9	1.9	12.4	17.2	24.1	25.0	27.3	25.3	21.1	16.9	9.0	1.5
Wuhan	5.3	5.1	12.9	17.3	21.9	25.7	27.7	26.1	23.7	18.6	11.7	4.8
Changsha	9.2	6.5	13.6	18.8	22.6	26.1	29.2	27.5	25.2	21.7	14.4	8.4
Guangzhou	13.0	13.0	17.3	22.6	24.9	28.2	28.9	28.0	27.5	24.0	20.1	12.8
Chongqing	8.5	9.2	14.5	19.7	21.2	24.1	29.7	27.5	24.7	20.4	14.0	9.1
Chengdu	6.0	6.7	11.9	17.9	20.4	22.9	25.3	24.0	21.6	17.7	11.8	5.8
Xian	2.9	2.3	12.0	16.1	21.1	26.0	29.1	25.1	20.3	16.4	8.9	2.2

(3)

Packaging ambient humidity

%RH

Explanation...

Reference: part of the city monthly average humidity, 2014 (Extract from China Statistical Yearbook 2015 data), the reference data to fill in nearby cities.

City	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Beijing	45	55	37	45	40	59	61	62	66	65	52	34
Tianjing	60	62	52	49	45	63	66	69	71	67	58	41
Shenyang	55	49	49	38	59	72	72	71	64	57	55	62
Haerbing	65	65	58	42	66	63	73	74	67	55	54	69
Shanghai	70	80	69	75	64	80	81	82	80	68	71	60
Nanjing	66	80	67	73	62	76	83	87	85	74	76	59
Hangzhou	66	81	69	74	67	78	78	83	82	68	76	56
Fuzhou	64	76	75	74	81	80	73	78	72	64	72	60
Jinan	48	57	39	52	34	60	66	71	76	58	57	37
Wuhan	73	82	76	80	76	78	81	84	85	82	82	70
Changsha	56	78	76	74	72	76	70	72	75	62	69	51
Guangzhou	70	79	83	83	88	82	80	82	79	72	78	67
Chongqing	82	78	76	80	78	85	68	75	82	80	87	82
Chengdu	80	83	79	78	74	84	84	87	87	86	85	79
Xian	40	75	54	70	53	57	56	67	82	71	67	43

(4)

Packaging volume

m³

Explanation...

(5)

Weight of hygroscopic packaging

Explanation...

(6)

Moisture content of water bearing materials

g/kg

Explanation...

(7)

Sealing layer surface area

m²

Explanation...

(8)

Moisture Vapor Transmission Rate of the sealing layer

g/m²·d

Explanation...

Moisture Vapor Transmission Rate refers to the steam permeability for the climate to be expected in g / m² • d.

Sealing layer material	Moisture Vapor Transmission Rate(g/m²·d)
PE-HDPE Thickness 50μm	1.60
PE-LDPE Thickness 100μm	0.96
PE-LDPE Thickness 200μm	0.46
PE-(Germany) MDPE Thickness 140μm	0.35
Aluminum foil PA12μm+Al3μm+LDPE85μm	0.01
Composite bag PA12μm+LDPE85μm	1.08
* Moisture Vapor Transmission Rate varies depending on different Sealing layer material. * The above data for reference only. We have advanced moisture vapor tester, we would like to offer help. * The above data the test environment is 23 ℃, 85% RH.

(9)

Expected days of storage

Explanation...

DIN55474 Packing Standards

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