Desiccants

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A n ISO 9001: 2000 Co .

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DESICCANTSMoisture Control to Industry

Proactive Approach for Protection of Packaged goods from Attack of

Moisture & Oxygen

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Why use Desiccants?You know the two biggest enemies of any Packaged Products?

Mois ture & Oxyg en

Lethal potential to damage metals, drugs, woods, plastics, glass,Foods, Cloth, Paper, Leather

The effects of Moisture & Oxygen are:Sim ply Devastat ing!

on the product life, presentability, functionality & performance, on profits & finally on the repute of manufacturer/exporter



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Moisture Control Strategy

In Packaged goods,

Reduce! (by MAP & Vacuum) Eliminate (by Desiccants) Prevent (by Barrier Packaging)



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Lets know more Moisture:Present in the air in the form of Vapors (Gas Phase) having more

penetrative & damaging ability than liquid form.We measure moisture in % RH w.r.t. Temperature and is dynamic

through out the year. Also the moisture in compressed air flow is measured as dew point.

Affects integrity of packaging materials, packaged products, bacterialgrowth, bad odour etc

Oxygen: Air contains about 20-21% OxygenOxygen can create havoc in presence of Moisture on variety of

materials including foods, foodgrains.Rust formation is very common occurrence on metals and is due toOxidation!

Other effects are formation on mold, mildew, bacteria, toxins, colorchange, insects



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But how does my packaging gets affected?

Problems faced in packaged solid productsof any kind?

Mold, Mildew, Bacteria, Insects, Rust, Corrosionetc. due to trapped moisture (water vapour,Oxidizing Gases) while packaging , shipment &storage.



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Let us look at different problems

CORROSION or RUSTING on Metal Products:

Iron and steel does not rust if the air over the surface has a RH below 50%RH.



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Handling Hygroscopic Materials

The quality of dry drugs, dry food, hard candy and other hygroscopicmaterials can only be maintained if it is kept in contact with air at a lowrelative humidity. Most hygroscopic materials are "comfortable" at arelative humidity below 50%RH. There are some materials, for exampleinstant powder for drinks, that require 15%RH.



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MOULD Mould and fungus formation is prevented if the surrounding air is

kept below 60%RH.

BACTERIA Bacteria need humidity to survive andmultiply. Often these conditions arefound on hygroscopic material. If thesurrounding air relative humidity is heldbelow 50%RH most bacteria will not finda suitable environment to multiply.



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ODOUR Bad smell will be drastically reduced if the relative

humidity is kept below 50%RH.



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Problems! Problems! Problems! Problems! Problems!

Con tainer Rain

Rust , Corros ion

Mold , Mildew and B acter ial Grow th

Weak Carto ns , Label Dam ages

Odour

Problems! Problems! Problems! Problems! Problems!



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Which solution is better? Desiccants & O-Busters are economical yet more effective. Work by removing (adsorption) available Moisture & Oxygen in

packaged/sealed environment. Have very high affinity for moisture &Oxygen.

VCI: Vapour Corrosion Inhibitors emmit vapours & form a thin coatingon surfaces thus not allowing the moisture to deposit on it. Theproblem is, the vapours do not reach out to remote corners or

surfaces.

In any case the Desiccants or VCI work only in packaged environmentinside hermetically sealed Moisture Barrier Bags.

Moisture Barrier Bags: Bags with very Low MVTR & OXTR (MoistureVapour Transmission Rates ). These bags have capability to preventoutside moisture/oxygen to penetrate inside.

MAP & Vacuum Packing: Reduces/removes air inside packagedgoods.



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Solution to Moisture & Oxygen menace in the form of

Desiccants & O-Busters:

Used for protection of packaged goods from attack ofMoisture/Odour or Gas & to prevent formation of Mold,Mildew, Bacteria, Insects, Toxins, Color change, Tastechange, Corrosion or Rusting (Oxidation).

Humidity Indicating Cards: A low cost method of indicating humidity conditions inside

various types of barrier packaging. MBB : Mois ture Barr ier Bags:

Nylon Laminated multilayered Aluminized Bags MAP & Vacu um Heat Sealers fo r BagsN2 Purging, Vacuuming & Sealing



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Materials/Equipments for Protective Packing:



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Desiccants in Packaging ApplicationsPackets/Pouches/Bags

Major Desiccant Types:

Clay: Clay is natural/non-hazardous/inexpensive/highly effectiveadsorbent within normal temp. & RH changes. However hastendency to release moisture back on saturation

Silica Gel: Form of silica manufactured from Sod. Silicate andacid. Non hazardous, porous molecular structure that closelyresembles a sponge, with very high capacity (40% of its own weightat 100% RH) for moisture adsorption. Indicating/Non indicating type.

Molecu lar Sieves: Synthetic crystalline version of Zeolitecontaining a network of uniform pores and empty cavities. Is derivedfrom Na, K or Ca Alumina Silicate (Al2O3.SiO2). MS is the mostaggressive and expensive of the primary desiccants.



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Desiccants

Capacity Vs Relative Humidity



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FACTORS FOR THE CONSIDERATION IN CALCULATINGMOISTURE ATTACK

Container Size / Box Size / Packing dimensions should beknown.

Thickness for the packing material . MVTR should be known. Free space / void / head space should be known.

Outer wrapping thickness during shipment should be known. Shelf life of the product. Moisture content should be calculated with respect to weight of

the product. Transition time & route should be known. Packing environmental conditions should be recorded.



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How are Desiccants Rated?

Packaging experts face a confusing array ofvariables when selecting moisture adsorbentspartly because moisture control is a multifacetedchallenge. There are four sources of watercontamination in a closed container or package:

Water vapor in the air inside the package Water vapor adsorbed by the materials inside

the package Water vapor on the walls of the package Permeation of water vapor into the package.



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Types of protections

The protection to be provided depends on vulnerability of product & packaging,

the markets to be served & value of products.

eg: A VVIP is prov ided with Z or Z plus secur i ty co mp ared to an MLA orCorporator

Desiccants provide low co st insurance/secur i ty to your produ cts!

There can be three tiers of protections:

Single Tier: Desiccant is placed in direct contact with goods to be protectedinside primary packing having sufficient barrier packaging.

Two Tier: Desiccant is placed inside primary as well as secondary Packing(usually Corrugated boxes further with stretch wrapping)

Three Tier: Inside the shipping containers 20 or 40 for the exports throughsea route

In the third layer protection Cargo Dry Paks are used to preventContainer Rain & keep the containers in dry condition.



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Quality Parameters-Desiccants Should have very high adsorption capacity Should have low residual moisture (LOD)

The desiccant material should have neutral pH (6.5-7.5), inert& non-toxic in nature

Should be packed in non-dusting, non-tearable, non-lintablepacking materials preferably spun-bonded olefins

The packet material should not have wetting effect on surface

upon saturation Should be confirming to International standards CFR/EUcompliant, MIL-D specs, JDEC- 033, FDA etc

Should be active (RTU) when using, The packet material should be permeable to moisture

Desiccant must have moisture holding capacity at highertemperatures below evaporation point of water Desiccant should not release water upon saturation



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Do & Don'ts-DesiccantsDos:

Always use desiccants when you are ready to pack your goods &seal immediately Place the desiccants at different locations inside the package & near

the possible sources of air permeation Store in the original container away from darkness

Look at the HIC placed inside the desiccant container before using

Do nots: Expose the desiccants unnecessarily

Remove the HIC card from the original container Use over-exposed desiccant pouches Punch holes in the desiccant packets



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Your One Point Contact Your most reliable source for Desiccants, other

packaging products All products available in INR payment Ex. Stock: Most of the Desiccants Low lead time for special/bulk products Provides pre & post sales support Support in Regulatory Documents

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