PROSorb - Product information and prices

PROSorb is a new silica gel ideally suited for stabilizing relative humidity inside museum display cases and storage cabinets.

The ideal level of humidity for most museum display cases and storage cabinets is between 40 - 60% RH (Relative Humidity). It is also desirable to maintain this level for as long as possible.

PROSorb has a unique and exceptional adsorption capacity within the 40 - 60% RH range (see graph to the right), and surpasses all other products sold for this purpose.

PROSorb is able to maintain a stable RH within narrow margins through its ability to both absorb and desorb water vapour; and is provided pre-conditioned to your desired humidity level

PROSorb also has a longer life span than other silica gels.

Which silica gel is best for which humidity range?

0 - 35% rF: Silicagel E
35 - 60% rF: PROSorb
60 - 80% rF: ART SORB
80 - 95% rF: Silicagel M

Graph 2 - click to zoom

Table: Adsorption capacity at 25°C:

	PROSorb		ART SORB		Silica gel E = microporous		Silica gel M = macroporous
Relative humidity	Water adsorption in weight %	Bbetween 40% - 60% RH	Water adsorption in weight %	Between 40% - 60% RH	Water adsorption in weight %	Between 40% - 60% RH	Water adsorption in weight %	Between 40% - 60% RH
10% RH	6.2%		6.5%		7%		2%
20% RH	10.6%		11.5%		14%		3%
30% RH	16.2%		16%		20.5%		4%
40% RH	22.5 %	16,3%	22%	13%	25%	5,5%	5%	3%
50% RH	30.4%		26%		28.5%		6.5%
60% RH	38.8%		35%		30.5%		8%
70% RH	44.9%		54%		32%		11%
80% RH	46.8 %		67%		33%		17%
90% RH	48 %		74%		34%		32.5%
100% RH	49 %		80%		35%		93%

Further advantages of PROSorb

Free of chlorides: PROSorb contains no lithium chloride, unlike some other products (lithium chloride is a chemical - salt, potentially harmful to many metals. This salt can be transferred to metals in dust or by human touch). PROSorb consists of 97% SiO₂ und 3% Al₂O₃.
Low abrasion: PROSorb beads produce less dust than other silica gels (abrasion< 0.05 weight-% according to MIL-D).
High bulk density: 1 kg PROSorb only needs a volume of ca. 1.5 l (much less than some other silica gels).
Long term stability: PROSorbmaintains most of its capacity well beyond the 2-5 years during which other silica gels have lost a much of their capacity.
Economical: PROSorb is much cheaper than the other products sold for the same purpose.
Temperature dependency: PROSorb is conditioned in relation to temperature. PROSorb reacts in the same way as organic materials. Therefore there will be no, or little, transfer of water vapour between organic materials and PROSorb if the temperature changes. Under fluctuating temperatures, this property protects wooden objects and other organic materials from swelling or shrinking: The conditioning indicated on the labels refers to 20°C. At 10°C the conditioning of the cassettes will be around 1 – 1.5% RH lower, at 30°C around 1 – 1.5% RH higher.

Further technical data

Bulk density	ca. 0.7 kg/l
Pore volume	ca. 0.5 ml/g
Breaking strength	over 200 N
Internal surface area	ca. 750 m²/g

PROSorb cassettes and sachets:

PROSorb cassettes are easier to handle than beads. They don’t need trays or containers and are quickly replaced. Re-conditioning of their RH-value is easily achieved by weight within the first 1 - 2 years. After a longer period, due to the slow degradation shown by all types of silica gel, conditioning must be checked with a calibrated hygrometer. The cassettes consist of sturdy PP and vapour-permeable non-woven polyester. They are filled with PROSorb beads.

PROSorb full-size cassettes Dimensions: L 335 mm, W 110 mm, H 44 mm. Content: 950 g beads. One or more cassettes per cubic metre of air volume are required, depending on the application (see: PROSorb directions)
PROSorb half-size cassettes Dimensions: L 335 mm, W 110 mm, H 24 mm. Content: 500 g beads. One or more cassettes per 0.7 cubic metre of air volume are required, depending on the application (see: PROSorb directions)
PROSorb sachets, dust-proof Made of PE and TYVEK 1073, (non-woven PE, dustproof, sturdy, vapour-permeable). Everything made to your requirements: dimensions (up to 35 x 35 cm), content in g, conditioning. The sachets are stamped with content, conditioning and weight, so you can use them like cassettes.

PROSorb beads and cassettes can be ordered, with no additional charge, conditioned to the following RHs: 35%, 40%, 45% 50%, 55%, or 60% RH (please indicate along with your order). Conditioning refers to 20°C, with a tolerance of ±2% RH.

Prices

PROSorb beads Sealed in aluminium bags. From 8 kg packed in metal containers Please indicate the desired conditioning: 35%, 40%, 45% 50%, 55% or 60% RH	1 kg	43.- € / kg
	from 5 kg	40.- € / kg
	from 10 kg	39.- € / kg
	from 20 kg	38.- € / kg
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PROSorb full-size cassettes Dimensions: 335 x 110 x 44 mm; content: 950 g beads; PP/polyester, non woven Please indicate the desired conditioning: 35%, 40%, 45% 50%, 55% or 60% RH	1 cassette	48.- € / cass.
	from 4 cassettes	45.- € / cass.
	from 8 cassettes	44.- € / cass.
	from 24 cassettes	43.- € / cass.
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PROSorb half-size cassettes Dimensions: 335 x 110 x 24 mm; content: 500 g beads; PP/polyester, non woven Please indicate the desired conditioning: 35%, 40%, 45% 50%, 55% or 60% RH	1 cassette	29.- € / cass.
	from 4 cassettes	28.- € / cass.
	from 8 cassettes	27.- € / cass.
	from 24 cassettes	26.- € / cass.
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PROSorb sachets

Everything made to your requirements:

dimensions (up to 35 x 35 cm)
content, gross weight and conditioning stamped on top side, so you can use them like cassettes
conditioning (35% 40%, 45%, 50%, 55% or 60% RH)

Material: bottom LDPE, top TYVEK 1073, (non-woven PE, dustproof, sturdy, vapour-permeable), sealed in aluminium bags.

Price per sachet:

Standard size: 35 x 15 cm, good for up to 500 g of PRO SORB:
€ 1.50 + price for the content.

All other sizes independent of dimensions, content and conditioning:
€ 2.- + price for the content.

Special designs possible: e.g. straps for hanging, etc. (price on request)

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PROSorb sheets

We can make sheets 13 mm thick for special applications:

dimensions (up to 120 x 59 cm)
content: up to 4.2 kg PRO SORB for a sheet 120 x 59 cm
conditioning: we cannot condition to an exact RH value. The user has to condition the sheets himself by exposing them for >2 days in a room with the desired climate.

Material: polystyrene grid 12 x 12 mm, filled with PROSorb beads, lined both sides with non-woven polyester, sealed in PE film.

Special designs possible: e.g. openings for hanging, etc.

Price on request.

At the moment it's still quite pricy because every sheet is custom made by hand and it's quite labour-intensive.

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Terms of sales and delivery

Products in stock are usually sent out within one week. Nevertheless, please order as early as possible. Transport is normally by UPS standard (±2-3 days within Europe), shipping and packing are billed with € 5.- + shipping costs, from € 200.- only the real shipping costs.
All prices exclude VAT. Payments can be made within 30 days by bank transfer, within 14 days with 3% discount. All prices are subject to change without prior notice according to our terms and conditions. Check our website for actual information.

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