Narrow pore silica gel type A

Product Overview

Description

Dessicant Silica Gel

(for MILITARY specification silica gel, please contact us)

The microporous structure of silica gel affords a high surface area (up to 800 m²/g) that is ideal for the scavenging of atmospheric moisture. Since there is no chemical reaction associated with the dehydration process, desiccated compounds are never exposed to harmful by-products or contaminants.

Silica gel is used widely as a laboratory desiccant for the following reasons:

• It can adsorb up to one third of its own weight in water vapour (this adsorption efficiency is approximately 36% greater than that of typical desiccant clays)


• It has an almost indefinite shelf-life if stored under airtight conditions


• Once saturated with water, silica can be regenerated by gentle heating


• With the exception of strong alkalis and hydrofluoric acid (HF), it is inert and resistant to attack or corrosion


• It is non-toxic, non-flammable and easy to handle


• It maintains the appearance of a dry product and its shape remains unchanged even when fully saturated with water

Standard white silica gel is referred to as being non-indicating. Self-indicating silica gels possess a chemical compound or dye that changes colour as moisture is adsorbed.

Our self-indicating desiccants are available in “blue to pink” and “orange to green or white” format. Please note that medium size granules (1 – 5 mm) are suitable for laboratory desiccants whilst larger granules (2 – 5 mm or 4 – 8 mm) are normally employed in dynamic adsorption processes.

Characteristics

Silica gel	Bulk density g/l	Pore volume ml/g	Pore size Å	Surface area m2/g	pH	Fe%	Cl-%	Moisture %
Type A	670 min	0.35-0.45	20-30	600-800	4-8	<0.03	<0.03	<1.5
Type B	500-600	0.6-0.85	45-75	450-600	5-8	<0.03	<0.03	<2
Type C	400-550	0.7-1.0	80-100	300-500	5-8	<0.03	<0.03	<3
Shape: Sphere/ Irregular     Sizes(mm): 0.1-0.3; 0.2-1.0; 0.5-1; 0.5-2; 1-3; 1-4; 2-5; 3-7

Adsorption Capacity

Item	Type A	Type B	Type C
RH=10%,% ≥	6.0	---	---
RH=20%,% ≥	10.5	5.0	---
RH=40%,% ≥	21.0	----	---
RH=50%,% ≥	23.0	15.0	---
RH=60%,% ≥	26.0	----	---
RH=80%,% ≥	32.0	----	---
RH=90%,% ≥	36.0	70.0	RH=100%, 85min