Processing of Tablet

Mr. R. R. Patil
Dr. Shivajirao Kadam College of Pharmacy, Kasabe
digraj, Sangli

Introduction
 Tablet is defined as a compressed solid dosage
form containing medicaments with or without
excipients.
 According to the Indian Pharmacopoeia
Pharmaceutical tablets are solid, flat or biconvex
dishes, unit dosage form, prepared by
compressing a drug or a mixture of drugs, with or
without diluents.

Advantages:
 More stable than liquid dosage forms, may have
longer shelf –life.
 Portable, easy to handle.
 Better in accuracy & precision of dose.
 Cost is lowest of all oral dosage form.
 Easiest and cheapest to package and strip.

Cont…
 Objectionable odour and bitter taste can be
masked by coating technique.
 Greatest chemical and microbial stability over
all oral dosage form.
 Sustained release product is possible by enteric
coating.

Disadvantages:
 Difficult to swallow in case of children and unconscious
patients.
 Disintegration & dissolution of tablets are rate-
determining factors for drug absorption & usually they
show slow onset of action.
 Slower onset of action than parental dosage form.
 Drugs having low bulk density cannot be formulated into
dense compact tablets.
 Tablets cannot be used in emergency cases.

TYPES OF TABLETS
 (A) TABLETS INGESTED ORALLY:
1. Compressed tablet
2. Multiple compressed tablet
3. Multilayered tablet
4. Sustained action tablets
5. Enteric coated tablets
6. Sugar coated tablet
7. Film coated tablet
8. Chewable tablet

Cont…
(B) TABLETS USED IN ORAL CAVITY:
1. Buccal tablet
2. Sublingual tablet
3. Troches or lozenges
4. Dental cone

Cont…
(C) TABLETS ADMINISTERED BY OTHER ROUTE:
1. Implantation tablet
2. Vaginal tablet, e.g. Clotrimazole tablet

Cont…
D) TABLETS USED TO PREPARE SOLUTION:
1. Effervescent tablet
2. Dispensing tablet
3. Hypodermic tablet
4. Tablet triturates

MULTILAYERED
TABLETS
BUCCAL TABLET
SUBLINGUAL TABLET
LOZENGE TABLETS
DENTAL CONES
VAGINAL TABLETS
EFFERVESCENT TABLETS
TABLET TRITURATES

TABLETS INGESTED ORALLY
 Compressed tablet (C.T): These tablets are uncoated,
provides rapid disintegration & drug release. These tablets
contains water soluble drugs.
 Multiple compressed tablets (M.C.T): To avoid
incompatibility, the ingredients of the formulation except the
incompatible material are compressed into a core tablet &
then incompatible substance along with excipients are
compressed over the previously compressed core tablet.
 Multilayered tablets: These tablets consist of two or more
layers of materials compressed successively in the same
tablets. These tablets having layers of different colours are
known as “multicoloured tablets”. These tablets are prepared
to separate incompatible ingredients physically.

Cont..
 Sustained action tablets: These tablets gives a sustained action
of medicaments. These tablets release the medicaments in a
sufficient quty. as & when required to maintain the maximum
effective con. of the drug in the blood throughout the period of
treatment.
 Enteric coated tablets: These tablets are designed in a such a
way that it bypass the stomach & get disintegrated in the
intestine only. e.g. anthelmentics & amoebicides.
 Sugar coated tablets : use for mask the unpleasant odour, taste
of the medicament & also protect from the atmospheric effect.
 Film coated tablets : Use the polymers for coating purpose such
as, HPMC, hydroxypropyl cellulose, ethyl cellulose for protection
from atmospheric effect. Those polymers little increases in
weight & have less elegance than that of sugar coated tablets &
tasteless.

TABLETS USED IN ORAL CAVITY
 Buccal Tablets: These tablets are placed in the buccal pouch or
betw. the gums & lips. Those tablets main role is slowly
disintegrate & absorbed directly without passing into the
alimentary canal .e.g. tablets of ethisterone
 Sublingual Tablets : These tablets are placed under the tongue
where they dissolve or disintegrate quickly & absorbed directly
without passing G.I.T .e.g. tablets of glyceryl trinitrite.
 Lozenge tablets & troches : These tablets are designed to exert a
local effect in the mouth or throat. These tablets are used
commonly to treat sore throat or to control coughing in common
cold.
 Dental Cone : These are minor compressed tablets meant for
placing them in the empty sockets after tooth extraction. They
prevent the bacterial action by using antibacterial compounds or
to reduce bleeding by containing the astringent. These tablets
contains lactose, sodium bicarbonate, sodium chloride etc. These
tablets dissolved in 20 to 40 mint. time.

TABLETS ADMINISTERED BY OTHER
ROUTES
 Implantation Tablets : These tablets are placed under the
skin by minor surgical operation & are slowly absorbed. The
implants must be sterile & should be packed individually in
sterile condition. Those are mainly used for administration of
hormones such as testosterone etc.
 Vaginal Tablets : These tablets are dissolve slowly in the
vaginal cavity. These are oval or pear shaped. These tablets
used to release steroids, antibacterial agents, antiseptic or
astringents to treat vaginal infection.

TABLETS USED TO PRODUCE SOLUTIONS
 Effervescent Tablets: These type of tablets dissolve rapidly
in water & produce effervescence due to chemical reaction in
between alkali bicarbonate & citric acid or tartaric acid or
combination of both. These tablets should be stored in air
tight containers for prevention of moisture.
 Dispensing Tablets : These tablets are highly toxic if taken
orally. This type of tablets are added to a given volume of
water to produce a solution of a given concentration. In that
tablets include mild silver proteinate, bichloride of mercury
merbromin and quarternary ammonium compounds. e.g.
enzyme tablets (Digiplex)

Cont..
 Hypodermic Tablets : These are compressed tablets which
are contains one or more drugs with readily water soluble
ingredients. These tablets are dissolved in sterile water or
water for injection and administered by parenteral route. So,
special precautions are needed to be taken during their
preparations. These tablets however are not preferred
nowadays because chances that the solution prepared from
hypodermic tablets may be a non-sterile.

PREPARATION OF GRANULES FOR
COMPRESSION
 The following steps are involved during the preparation of
granules:
Weighing of the ingredients.
Mixing the powdered ingredients and excipients.
Converting the mixed ingredients into granules.

Methods of Granules Preparation
 MOIST GRANULATION METHOD
 DRY GRANULATION METHOD
 GRANULES BY PRELIMINARY COMPRESSION

MOIST GRANULATION METHOD
 API + excipients such as diluents, binding agents, disintegrating agents
with q.s. moistened granulating agent.
 Make a coherent mass.
 Pass through sieve no. 8 or 10.
 Dried at 600C.
 Then dried granules passed through sieves.
 Then add lubricating agent, any volatile subst. & mixed well.
 Ready for compression.

DRY GRANULATION
 Dry granulation process are generally use for those drugs
having crystalline properties or for having present in
granules & having it’s own binding property.
 Those drugs are passed through sieve no.20 or any other
specified sieve.
 Then mix with additional excipients such as diluents &
lubricants.
 Ready for compression.
 e.g. Aspirin tablets, sodium bromide tablets etc.

GRANULES BY PRELIMINARY COMPRESSION
 This method is also called as “SLUGGING METHOD”.
 This method is used for those drugs which are unstable in
presence of moisture.
 In this method firstly dry powder is compressed into large tablets
or slugs.
 Then those tablets or slugs broken into small pieces & passed
through a specified sieve to obtained a suitable size granules.
 Then mixed with a suitable lubricating , disintegrating &
granulating agents.
 Ready for compression.

EXCIPIENTS USED IN
FORMULATION OF TABLETS
1. Diluents
2. Granulating agents
3. Binding agents
4. Disintegrating agents
5. Lubricants
6. Adsorbents
7.Colouring agents, Flavouring agents and
Sweetening agents.

Cont…
 DILUENTS :
- The diluents is needed in the formulation of tablets, when
the quantity of medicament in each tablet is very small & it is
not possible to make a good tablet.
- E.g. Lactose, Sucrose, Sodium chloride, Dextrose,
Starch, Mannitol, Sorbitol, Calcium sulphate dihydrate,
dibasic calcium phosphate dihydrate.
 GRANULATING AGENTS : Those agents converts the fine
powder into granules .
- By providing proper moisture to convert fine powder to damp
mass.
- E.g. Water, Alcohol, Mucilage of starch, Mucilage of
acacia, Mucilage of tragacanth, Gelatin solution, Iso-
propyl alcohol, Acetone etc.

 BINDING AGENTS :
- These agents provides good strength to the granules, in order
to keep the tablet intact after compression.
- Concentration of binding agents depends upon the type of
tablet i.e. In lozenges & implants tablets have very high conc.
of binding agents.
- Whereas in other cases where the tablets has to disintegrate
quickly in that conc. of binding agent used in lower
proportion.
- Binding agents used along with granulating agents.
- E.g. Acacia powder, Tragacanth, Gelatin, Sucrose,
Methyl cellulose.
Cont…

 DISINTEGRATING AGENT :
- Disintegration agents gives ensured to disintegrate of the
tablets into smaller particles when swallowed.
- These agents are used in the formulation of oral or sublingual
tablets.
- Those agents divided into two parts, one part is mixed with
other excipients before granulation & other part is mixed
with the dry granules before compression.
- They act in three ways :
1. By swelling : in contact with water or moisture e.g. maize
starch, potato starch, methyl cellulose & bentonite.
2. By producing effervescence : e.g. sodium bicarbonate, citric
acid & tartaric acid.
3. They melt at body temperature : e.g. cocabutter.
Cont…

 LUBRICANTS : They provide to improve appearance, flow
properties & use to prevent the sticking of the materials to
the dies & punches.
- Means they play three roles Viz.. Lubricant, Glidants &
anti-adhesive agents.
- E.g Talc, Magnesium stearate, calcium stearate, sodium
chloride, Boric acid, Starch, Liquid paraffin, Stearate
acid etc.
 ADSORBING AGENTS : These substances are used to
adsorb volatile oil, liq.extract & tinctures etc. which are
included in the formulation of tablets.
- E.g. Magnesium carbonate, Kaolin & Starch
Cont…

 COLOURS, FLAVOUR & SWEETNING AGENTS:
- Colours produce elegance effect on tablet.
- Certified F.D & C dyes are used. They mixed with granulating
agents or mixed with other ingredients before granulation.
- Flavours are used mainly in Lozenges, effervescent & in
chewable tablets.
- Falvouring agents is dissolved in organic solvents & then
sprayed on the granules.
- Sweetening agents use to improve the taste of tablets.
- Now a days artificial sweetening agents are used e.g.
Saccharin & Cyclamates.
- Commonly used sweetening agents are Sucrose, Lactose,
Mannitol.
Cont…

COMPRESSION OF GRANULES
INTO TABLETS
 The various type of machines used for this purpose,
are:
1. Single punch tablet machine which may be hand
operated or electrically operated
2. Multi-punch tablet machine
3. Rotary tablet machine
4. Dry cota tablet machine

SINGLE PUNCH TABLET MACHINE
 Hopper shoe
 Lower punch
 Upper punch
 Capacity regulator : To adjust
the position of lower punch to
accommodate the required qty.
of granules by the die.
 Ejection regulator
 Die
 Driving wheel

Working:
 The upper punch rises to allow the hopper shoe to
move over the die.
 The lower punch drops & granules feed in the die from
the hopper shoe.
 The shoe moves aside & the upper punch drops, thus
compressing the granules into a tablet.
 The upper punch rises upward & the lower punch rises
upto the surface of the dies to eject the tablet.

MULTI-PUNCH TABLET MACHINE
 In a multi-punch tablet machine there are 2 to 12 dies on a
big platform.
 The working of this machine similar to that of a single
punch machine but in this machine one stroke as many
tablets are compressed .

ROTARY TABLET MACHINE
 It is used in large scale production unit.
 In this machine 1200 tablets are prepared in one minute.
 There are 70 sets of dies & punches.
 A rotary tablet machine has a circular rotating head, carrying
a number of punch & dies assembles.
 There is uniform filling of the die.
 In that compression of granules takes place as the upper &
the lower punches pass between a pair of rollers.

Working…
 Fix the upper & lower punch & dies.
 Then adjust the feed hopper.
 Adjusting the tablet weight & hardness.
 Fill the hopper with granules.
 When the machine starts, the hopper delivers the granules
to the dies.
 Then circulate rotating head & compressed the granules with
help of upper & lower punch.

DRYCOTA TABLET MACHINE
 The machine is used for manufacturing of multi-
compressed, multi-coloured & press coated tablets.
 In this machine two rotary machines work simultaneously.
 The core tablet is prepared in one machine which is
transferred to the second machine for compress coating.

MANUFACTURING DEFECTS IN
TABLETS
 CAPPING
 PICKING & STICKING
 MOTTLING
 WEIGHT VARIATION
 HARDNESS VARIATION
 DOUBLE IMPRESSION

CAPPING
 Means, partial or completely remove of top or bottom portion
of the tablet.
 Reasons:
Excessive fines in granules.
Defective punches & dies.
High speed of tablet machine.
The granules are too dry.
 Defects can be overcome by:
Reduce the % of fines
Defective punches should be replaced or polish before use.
Regulate the speed of tablet machine.
Maintain moisture content.

PICKING & STICKING
 Means, picked the material by upper punch & sticking case,
stick the material to wall of the die.
 Reasons:
Use of small qty. of lubricants
Defected punch & dies used
Presence of moisture content in granules.
A new set of die & punches.
Use of required qty. of lubricant
Use dry granules.

MOTTLING
 Means, unequal distribution of colours on tablet
surface.
 Reasons:
Not properly mix colours with granules
Use of different coloration of medicaments &
excipients.
Migration of dye in the granules during the process of
drying
Drying the granules at low tempr.

WEIGHT VARIATION
 Reasons:
Granules are not in uniform size.
No proper mixing of lubricants.
No uniform flow of the granules from the hopper.
Use of excess amount of fine powder.
Use of required qty. of lubricant
Reduce the % of fines
Regulate the speed of tablet machine.

DOUBLE IMPRESSION
 This defect occurs when the lower punch has a
monogram or some other engraving on it.
 Due to some defect in the machine, lower punch
moves slightly upward before ejection of a tablet &
gives second, though light, imprint on the tablet.
 This defect can be overcome by controlling the
undesirable movement of the lower punch.

COATING OF TABLETS
 Tablets are coated for following purposes:
To mask the unpleasant taste and odour
To improve the appearance of tablets
To prevent the medicament from atmospheric effects
To control the site of action of drugs (Enteric coating)
To produce the sustained released product.
 The tablet coating is generally done by using any of
the following processes:
Pan coating
Press coating

PAN COATING
 In this technique coating is done in pan.
 This pan made up of copper or stainless steel.
 This pan rotated with the help of an electric motor.
 Hot air is blow in & the speed of the pan adjusted in a such a
way that the tablet remain separated from each other.
 After coating polishing is done in polishing pan.
 Pan coating technique used for sugar coating, film coating &
enteric coating.

PRESS COATING
 In this technique firstly prepared coating material.
 Then, this coating material spread on performed tablets in a
Drycota rotary tablet machine.
 The whole operation is carried out automatically in a number
of series.

SUGAR COATING
 Sugar coating technique it is the oldest method for
mask the taste of tablets.
 But now a days a various stages involved in sugar
coating for improving it’s aesthetic value.
 The various stages are as follows:
1. Sieving
2. Sealing
3. Subcoating
4. Syrup coating
5. Finishing
6. Polishing

Cont..
 Sieving : The tablets to be coated are shaken in a suitable
sieve to remove the fine powder or broken pieces of tablets.
 Sealing : At this stage prepared the water proof layer on the
surface of the tablet. This is done by using shellac or cellulose
acid phthalate.
- Firstly shellac or cellulose acid phthalate is dissolved in
alcohol or acetone & it’s several coats are given in a coating
pan.
 Subcoating : At this stage building up the tablet size by
several coats of concentrated syrup containing acacia or
gelatin. After each addition of syrup, dusting powder is
sprinkled. The dusting powder is a mixture of starch, acacia
& talc. Dusting powder does not allow the tablets to stick
together. That all process done in coating pan.

 Syrup Coating : At this stage sugar coat, opacity & colour
apply to the tablets.
- Several coats of the syrup with syrup contains coloring
material & opacifying agents are applied to the tablets.
 Finishing : Three to four coats of syrup are applied in
rapid succession without dusting powder & cold air is
circulated to dry each coat. This forms a hard smooth
coat.
Cont..

 Polishing :
 In that stage, firstly beeswax is dissolved in volatile organic
solvent.
 Then this solvent use to polishing on tablets.
 For polishing purpose polishing pan is used, which is made
of canvas cloth.
The polishing pan rotated at a suitable speed so that the wax
coated tablets are rubbed on the canvas cloth.
This gives a proper shining to the tablets.
Cont..

FILM COATING
 Film prepared or coated by using single or mixture of
polymers such as, HPMC, hydroxyethyl methyl cellulose,
carbowax, PEG-400 etc.
 In film coating firstly polymers is dissolved in some volatile
organic solvent & is sprayed over the tablets in rotating pan
or pan coating.
 This process is continue until the a uniform good film is
formed over the tablets.
 Film coating is also used to make the tablets water proof
before the sugar coating. Film coating can be enteric or non-
enteric.

Advantages of film coating
 It protects the drug from atmospheric changes, such as light,
air & moisture.
 Coating is resistant to cracking & chipping.
 It does not increases the weight.
 The tablets become elegant.
 Not much labour required.
 It is less time-consuming technique.

ENTERIC COATING
 Enteric coated tablets is given to ensure that these tablets
will not disintegrate in stomach but pass in the intestine &
get disintegrate.
 Using the rotating pan for coating purpose.
 salol, cellulose acetate phthalate, shellac which are dissolved
in a volatile organic solvent for coating purpose.
 Reasons for enteric coating :
Medicaments produce some irritation in the stomach.
The action of medicaments is required in the intestine e.g.
anthelmintics & amoebicides.
Medicaments get decomposed or destroyed by the acidic
medium of stomach.
Delayed action is needed.

MICROENCAPSULATION
 Microencapsulation is a technique by which coating can be
applied to small particles of solids, droplets of liquid or
dispersion thus forming microencapsulation.
 It is different from other coating methods because in that
process is used to coat the particles having particle size range
from several tenth of a micron to 5000 µ.
 Microencapsulation method based on:
 Chemical process (chemical or phase change)
 Mechanical process (physical change)

Cont..
 Following techniques are used for microencapsulation:
Pan coating
Fluidised bed coating
Coacervation
Electrostatic deposition
Vacuum deposition
Polymerisation
Multiorifice centrifugal process

Cont..
 Pan Coating : This technique is suitable in those cases
where the particle size is larger than 600µ. In that API
charged on to spherical pellets of sugar & then coated with
coating material in coating pan with hot air is circulated
simultaneously in order to speed up the drying process.
 Fluidised bed coating : In this method solid materials are
suspended with turbulent flow of air in a chamber & coating
material is introduced in the chamber with help of nozzles.
In this chamber the tempe. Is controlled in a such way that
the volatile organic solvent is vapourised. After cooling, the
heavy solid materials or particles fall on the screen near the
outlet form where these can be removed.

Cont..
 Coacervation : Coacervation means the separation of a liquid or
phase when solution of two hydrophilic colloids are mixed under
suitable conditions.
- In this method, the three immiscible phases of core material,
solvent and coating material are formed followed by deposition of
coating material on the core.
- The coating material is dissolved in a suitable solvent and the core
material is uniformly dispersed in the solution of the coating
material.
- Then the coating material is phased out of its solution which
starts getting deposited on the particles of the core material.

 Electrostatic deposition :
- The method is useful both for solid particles and liquid
droplets.
- In this process, the core and coating materials are electrically
charged by means of high voltage such as 10,000 volts etc.
- The core is charged and placed in the coating chamber.
- The coating material is also charged before it is sprayed as a
mist.
- Because the charges are of opposite kind, the coating
material gets deposited on the core due to electrostatic
attraction.
Cont..

 Vacuum Deposition : In that technique the coating
material gets deposited on the core particles & coating
material is vaporized under vacuum.
 Polymerisation : This is a new technique. In that technique
core material is dispersed in a liquid or gas in which
monomeric units of the coating material are present. These
monomers get polymerised at the interface between core
particles & the liquid gas phase which forms coat over the
core.
 Multiorifice centrifugal process : In that process the
particles of the core material are forced through an envelop
of coating material in solution by centrifugal force.
Cont..

Advantages:
 Mask the taste of bitter drug.
 It is used in formation of sustained release dosage
form.
 It is used to separate an incompatible material.
 Used to protect drug from moisture & oxidation.

EVALUATION TESTS FOR TABLETS
1. Shape of tablets
2. Appearance
3. Content of active ingredient in tablets
4. Uniformity of weight
5. Disintegration test for tablets
6. Dissolution test for tablets
7. Mechanical strength
8. Friability test

 SHAPE OF TABLETS : As per pharmacopoeia the shape of a
tablet defined as circular with flat or convex face.
 APPEARANCE : check the appearance by either a relatively
uniform texture. The coated tablets have a smooth surface.
 CONTENT OF ACTIVE INGREDIENT IN TABLETS : % of
API in case of official tablets are mentioned in the individual
monographs. The variation may be due to several factors
such as weight, purity of API, errors in preparing granules. In
that process carried out assay which are mentioned in IP for
specific tablets & those are based on 20 tablets. If 20 tablets
are not available at least 5 tablets should be used.
Cont..

% of API in tablets .This table stated limits are between 90%
& 110% of medicaments.
Cont..
Wt. of drug in each
tablet
Subtract from the lower
limits for sample of
Add to the upper limits
for sample of
15 10 05 15 10 05
120 mg or less 0.2 0.7 1.6 0.3 0.8 1.8
More than 120 mg & less
than 300 mg
0.2 0.5 1.2 0.3 0.6 1.5
More than 250 mg 0.1 0.2 0.8 0.2 0.4 1.0

 UNIFORMITY OF WEIGHT : This test use to determine the
uniform of weight of each tablet in a batch. But small
variation in the weight of the individual tablet is liable to
occur. Therefore a litter variation is allowed in the weight of a
tablet by the pharmacopoeia.
- wt. of 20 tablets selected randomly & determine their
average weight.
- Not more than 2 of the individual weight may deviate
from the average wt. by more than the % deviation.
Cont..

Uniformity weight of tablets
Cont..
Sr.No. Average weight of a tablet deviation Percentage
1. 80 mg or less 10
2. More than 80 mg & less than 250 mg 7.5
3. 250 mg or more 5

DISINTEGRATION TEST FOR TABLETS

 Tablet disintegration test apparatus use for compressed tablets but
not use for lozenges tablets.
 Pharmacopoeia specified limit for 15 mint.
 The assembly should be raised & lowered betw. 28 to 32 times per
minute in the liquid at 370C.
 The tablets are kept immersed in the liquid within tube.
 A cylindrical disc is made of transparent plastic having thickness
of 9.5 mm & diameter of 20.7 mm.
 The assembly is suspended in the liquid medium in a 1000ml
beaker.
DISINTEGRATION TEST FOR TABLETS

 DISINTEGRATION METHOD FOR UNCOATED TABLETS:
 Place one tablet in each of the 6 tubes of the basket.
 Then maintained temp. of water at 370C.
 After completion of 15 mints or the specified time in the
individual monograph.
 Observe the tablets .
 If, one or two tablets are not disintegrate then again repeat the test
on 12 additional tablets & observe the tablets .
 The tablets passes the test if not less than 16 of the 18 tablets
tested get disintegrated.
Cont..

 DISINTEGRATION METHOD FOR COATED TABLETS:
Place one tablet in each of the 6 tubes of the basket.
 If the tablet has a soluble external coating, immerse the
basket in water at room temp. for 5 mint.
Then add disc to each tube & suspend the assembly in water
at temp. 370C. & operate for 60 mint. or as per monograph.
If any case tablet has not disintegrate then replace the water
with 0.1 N HCl & again add 6 tablets.
The test is repeated on 12 additional tablets if one or two
tablets still to fail disintegrate.
The tablets passes the test if not less than 16 of the 18 tablets
Cont..

 DISINTEGRATION METHOD FOR ENTERIC-COATED
TABLETS:
Place one tablet in each of the 6 tubes of the basket.
If the tablet has a soluble external coating, immerse the
basket in water at room temp. for 5 mint.
Then operate apparatus without disc in 0.1N HCl for two
hours at 370C.
If no any tablet show to disintegrate or crack then add a disc
& operate the apparatus using phosphate buffer pH 6.8 at
370C. For 60 mints.
Then observe the tablets.
The test is repeated on 12 additional tablets if one or two
tablets still to fail disintegrate.
The tablets passes the test if not less than 16 of the 18 tablets
Cont..

 Place the 1000ml water or specific solvent mentioned in the
monograph into the vessel & those solvent which was
previously warmed at 36.5 or 37.50C.
 Place the specified number of tablets in the dry basket.
 Then start the motor & adjust the rotation speed to 100 rpm
or as per monograph.
 Withdraw the stated volume of solution from the vessel after
45 mints or as per monograph.
 Then determine the active ingredient present in the solution
by the method given in the monograph.
 Repeat the complete operation 4 times.
 The tablet pass the test if the amount of active ingredient in
solution is not less than 70% of the stated amount.
Cont..

MECHANICAL STRENGTH
 The pharmacopoeia has not fixed any standards for the
mechanical strength or hardness of tablets.
 The following devices are commonly used by
manufacturers
Monsanto hardness tester
Pfizer tablet hardness tester

 Designed by Monsanto chemicals
Co. Ltd.
 The reading unit Kg/Sq cm.
 Tested tablet placed in between
spindle & anvil.
 Then adjust to zero reading.
 Then apply the pressure as
clockwise till the tablet break.
 Then noted the reading.
 That reading indicates the
pressure which is needed to break
the tablet.
MONSANTO HARDNESS TESTER

 It is based on principle of plier.
 This tester is a plier fitted with
a pressure dial.
 The tablet is placed between the
jaw of the plier & pressure is
applied by pressing the handle
with hand unit until the tablet
breaks.
 The reading of the dial indicates
the pressure needed to break
the tablet.
PFIZER TABLET HARDNESS TESTER

 Friability test is performed to evaluate the ability of the tablet
to withstand wear and tear in packing, handling and
transporting.
 This apparatus consist of a plastic chamber, which is divided
into two parts & it revolves at a speed of 25 rpm.
 20 tablets are weighed & placed in the plastic chamber.
 The chamber is rotated for 4 mint or 100 revolutions.
 During each revolution the tablet falls from a distance of
6 inch.
 The tablets are removed for the chamber after 100 revolutions
& weighed.
 Loss in weight indicates the friability.
 The tablet are considered to be good quality if the loss in
weight is less than 0.8%.
Cont…

Processing of Tablet

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