WHAT ABOUT RESIN COATED SAND?

Resin coated sand is an excellent and accurate method in foundry practices.

For producing a casting of high precise dimensions, smooth surface,

free of blow holes & most casting defects you must use shell molding process & there for resin coated sand.

    The precedent of acts in:   A.R.E

 The only resource of Resin coated sand with resin for Foundry Helwan Company [pervious factory No.,"9"]

 for more than seven years.

 The main & only resource for Helwan Company of Non –Metal industries for 63 Military factory

 The main & only resource of the public Company of metals in at been

[one of the major Companies works in cast field]

 The main & only resource of the international company for cast [IN FIT] in Abu Rawaash .

it's an invest company which works in the field of main factoring tools of iron used in water

 The main and only resource of the major manufacturing companies in Egypt as:

Rubex, Ameryain Alex, Arab Tower and Elyo Misr Helwan.

 The main & only resource of all the companies and factories in ARE

which work in manufacturing healthy tools

 [ Grand-Gravana-Gold-Abdu Anafya group- all the foundries Specialist in manufacturing spare parts of cars ]

WHY YOU PREFER SANDCOAT?

Sandcoat  is a friendly company for foundries we are producing very wide variety,

 high quality resin coated sand

You may use our catalogue (over 28 kinds) if you want to choose a suitable kind

We can, also modify any kind decreasing or increasing A.F.S. number, resin content &

 tensile strength in accordance with the need & requirements of our clients

Our clients can confidently depend on us in the quantity best prices & free consultant services

Now, Sandcoat is the main supplier of resin coated sand for the great Egyptian companies &

 foundries and many Arabic foundries Sandcoat raw material is Egyptian

Resin is the most important one

This is a great adamantine for our clients because this insures a steady control quality of our products

Egyptian sand is the best all over the world

Welcome to our client family and try confidentially our products

    General remarks on the list of RESIN COATED sand:-

1.  AFS NO.     FINENESS

It's one of main world features of RESIN COATED SAND,

certain standard, whishes called (AFS No.)

The number gives us a sign of say fineness as follow "

SEAVE Shaker instrument must be available to get that No.,

. according to certain table

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2.    Strength 

Solidity is being measured by especial instrument for hot and gold strength;

the measure unit is KG/ CM2.

The moulds made of resin coated sand, needed a higher degree of strength,

as it contains the fusible metal inside for a while, till it freezes. Then gradually,

it changes from fusibility into solidity in short while [average from few seconds ….

to half minute or little more.

 This depends on quality of fusible natal and its temperature during in fusion,

mass of foundries and temperature of surrounding area.

CORES……   cores made of resin coated sand and used as internal bodies of foundries,

need to be v. high in strength, to give us certain space they only need to be suitable

in strength for the nature of fusible metal.

 For ex if we want to pour out a casting like from aluminum with internal space,

 this means that we should use kind of resin coated sand for making internal core.

 Internal – CORE… It's suitable for the temperature of fusibility of aluminum,

to be able to clean the casting in side after pouring it out.

This shows that the internal care made of resin coated sand,

burnt completely and disconnected, just few minutes after pouring.

The cores should all so be well strong,

not weak or shallow in away that allows it to resist the strength liquid metal .

this leads it to be broken during pouring and being spoiled.

In this case,

 it becomes not good to be used it may also lead to let part from

the surface of cores a way. Accordingly,

an increasing in the width of internal casting may happen.

As a result, its internal surface becomes coarse and step instead of being soft.

That means, It will be refused .

further more, we shouldn't deal with certain castings mechanically after pouring.

As round Grey cast iron needs a temperature over 1450  c

so we should use suitable resin coated

sand to get the best result.

 For Example   37PRIAF/B…37FOS/AF/B

                            37XHPR/AF/B...37FR/AF/B

Some metals are v. strong  so we can we then as cores and

Moulds like round 20 hr iron of and while iron as well .

then we can measure the ability of the resin coated sand

[the external blocks] to resist being full with the fusible metal in temperature .

 in the mean time same blocks that are divided into two halves are stuck

with an  external  material ,

then Its put under pressure 7 par  at most to get full stickiness between its two halves .

that needs strength , solidity and flexibility , so as not to be broken or having lines .

For Example

Glass is solid and flexible at brittle room  degree.

It's easy broken at any press or simple shock while a plastic material,

are usually found in form of pipes and plates,

which are less strong with high ability of flexibility

So, they are not broken during shocks or press they can also be used for along time.

Some cores are known with its length and little diameter.

There fore they are broken easily during its shipment,

Tran furring from a place to another, or putting into moulds before being 

Poured  this costs the factory a lot of expenses because of loss of great quantities so,

flexibility sand, especially cores.

In addition to that flexibility cold is less than it in hot,

because cores become less strong in hot conditions for stickiness of

resin coated sand

So flexibility is v. imp as we said before in internal cores or external moulds .

without the suitable strength, flexibility doesn't have a meaning beck.

Strength  makes flexibility reaches to its highest degree.

In case of decreasing strength, cores will be broken at the first bending or

at being exposed to an occasional effort.

There fore we can only make use of flexibility in presence of high strength .

In the mean time, flexibility shouldn't exceed a certain limit,

so as not to have curvature of cores on both right and light slider.

The best thing is to have a suitable degree of flexibility and strength as well,

to get very good costing  which is free from any defects, with the use of various

Resin coated sand 

The following table shows degrees of strength of resin coated sand with ranges,

beck, most of factories can't measure degrees of strength in hot and cold so

the following table guides then to choose with out the need to measure:

Measure unit: KG/CM2

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3.    Permeability

It's one of the main features in choosing the suitable kindly sand that

permeability means the ability of mould &

core to contain gazes coming out during pouring.

 That ability is increased according to space a many sand particles and vise versa

For example

XH group, which is known it's great coarseness, has v high permeability.

 FR-PR group, which is moderate fineness has high Permeability,

but less than XH.”FOS"

Group is very fine  with moderate permeability or even less moderate.

 Sand particles are known here with it’s around shapes so;

they are not connected together during touching .

this leads to a high permeability in both coarse and moderate fine  sand.

 There's another element affects permeability

it’s the ratio of risen should be very little to

keep permeability

 More over the less ratio of rising gazes during pouring ,

the less exposure to get inside the fusible,

metal  we can prove decreasing of Risen ratio through loss of ignitions after burning .

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4.    Loss of ignition ( LOT)

It's percentage guides us to the quantity of risen in coated sand ,

this has great importance in fusibility as the fusible metal gives

very high temperature which is enough to burn the organic tides 

among sand particles then gazes rise out side .

Those ought to have same tubes and stream holes inside for leaking

the pressed gazes out side easily or a lot of will defects will be happened  inside.

 LOI ratio is less during infusion as well according this;

leads to danger of freckles and air. Bubbles.

5.    Resistance to peel back

 One of the main features of our sand that it passes from solidity

into flexibility very fast after being exposed to certain temperature'

that gives organic frame only two forms .

the first a flexible from and connected. Secondly,

solid form disconnected.

 So, it can resist peeling back as there's no third from

[a flexible from and disconnected]

 If that rare condition happens, pealing back of masses must happen

as well this is considered defect of sand  sand we call it

"Poor In Peel Back] economically, getting empty cores will save a lot of money

 become less consumptions.

Moreover, this gives an ability to cores to have a lot of gazes during infusion.

This is very good for the user of precoated  sand together technically or financially

• Major points  

Our resin coated sand is good for storing without spoiling or self – interactions.

This should happen in a day climate and away from permanent hot weather and

pressure so as not to form masses inside sacks

 The best average temperature for sprinkled stamps in form (170f:300f almost)

 We advise to not fill more than 40KG in order to be easy in dealing by workers

and storing

-        If the user of sprinkled sand is able to get empty cores this leaders general

to good foundry.

-        Some consumers do a bad habit; which is mixing sand with water,

to get dough fanned onside wooden stamps,

then getting them out and roasting outside.

-        Here, we advise to use Ethel free from water, instead of water,

with ratio 5 Percent to get the farm and roasting it in fire as water

is very harmful for foundry. Then the evaporation inside the cast.

While Ethel comes out because of hot weather is vanished completely

and never causes any humidity in casting metal.

-        Also, one of undesirable habits is mixing different kinds in smoothness

and solidity to get Permeability as they think.

We oppose the habit as mixing sand together, doesn't make any sympathy,

which we insist to be there in on sand. In addition to that,

wrong mixing gives curved surfaces for cores and not Solid.

-        In turn this causes curved surfaces to the cast them selves.

-        Our sprinkled sand doesn't have pun get smells a irritant gazes

for  as we use kinds of risen and free from any methanol or formalin

•         mucous membrane of eyes & nose

•         Production and Technical Administration always welcome to solve any problem,

-        Recently, we look forward to establish anew factory for production

of tools and equipments, which are necessary to from tunicate sand,

whether moulds or cores.

This is to satisfy the clients and reaching the best ways and

methods in using the moulds

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