Celebrating their 104th Anniversary Loka Refractories is Ready to Tread the Challenges of a New EraCelebrating their 104th Anniversary, Loka Refractories is Ready to Tread the Challenges of a New Era
Loka Refractories - We extend our deepest gratitude on the 104th anniversary of PT. Loka Refractories Wira Jatim on January 17, 2022.

We commemorate this happy day in an event which was attended by representatives of PT. PWU Jatim, subsidiary representatives of PT. PWU East Java, the board of commissioners, directors AND all employees of Loka Refractories.

The event began with remarks from Loka Refractories' Director and Main Commissioner, and Director of PT. PWU Jawa Timur.

Then the event continued with the crowning of the best employee of 2022 who was chosen by all employees of Loka Refactories.

As a form of gratitude to the Almighty God, the Director of PT. Refractories Workshop cut a tumpeng that was given to the best employee as a form of appreciation for their performance throughout 2022.

After cutting the tumpeng, a small donation was also given to orphans.

Loka Refractories' anniversary ended with spiritual cleansing and prayer readings led by the Commissioner of PT. Refractories Workshop.

Thank you for all the support during our 104 years journey. In the future, we will rise to the challenges of the new era with continuous innovation based on shared strength and the spirit of kinship.

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6 Industries that Require Refractory Materials6 Industries that Require Refractory Materials

Loka Refractories - Did you know that refractory materials contribute to our daily lives?


Refractory materials actually have a big role in the existence of things we need everyday such as fuel, vehicles, electricity, shelter, and many more.


That's what makes refractory materials the foundation of the following industries. Want to know more about it? Check out the explanation below!


6 Industries that Require Refractory Materials


1. Smelters


Smelter is an industry that processes mining products so that the metal content increases. Smelter itself comes from the word smelting, namely the separation of pure metal from metal ore.


The process of separating pure metals from metal ores requires very high temperatures. This is where refractory materials come into play.


2. Cement industry


In the cement industry, refractory materials have a role as a protector of the steel shell and kiln shell from hot material, gas temperature, and abrasion.


In addition, the refractory plays a role in controlling the flow of material through the kiln. Refractory materials that are alkaline are often used by this industry.


3. Iron and steel industry


Various kinds of refractories are required in the production of iron and steel to operate the furnace.


Refractory materials are usually applied to the backup zone and working interface of the furnace according to their functions, including molding, mixing, transferring hot molten metal, molten steel and slag.


4. Glass and ceramics industry


Glass and ceramics are produced through a combustion process using a kiln/furnace oven.


Refractory material is a crucial component of the oven. The use of refractory materials plays a role in perfect combustion so as to produce quality products.


5. Chemical and gas industry


The chemical and gas industry involves very high heat and pressure energy, so a refractory material is needed.


Refractory materials with high alumina and insulation are needed in reformers, furnaces, reactors, burners, and many more.


6. Aluminum industry


The aluminum production process requires very high temperatures, such as in the refining and melting processes.


Various kinds of refractory materials are commonly applied to ladles and furnaces depending on the process. Industries that require refractory materials are not limited to those listed above.


There are still many other industries with various scales that require refractories.


For the sake of your industries, it is necessary to use good quality materials because refractory failure can cause substantial losses.


Want to get quality refractory material? Call us now!


E-mail: info@lokarefractories.com 
Telp : (031)7663307, 0821-4280-8500 


Source:  1 2

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Main Chemical Components of Refractory Bricks AluminaMain Chemical Components of Refractory Bricks: Alumina

Loka Refractories - You must be familiar with fire bricks or fire clay bricks right? Refractory bricks consist of many components in their raw materials.


However, the main components are alumina and silica. In this article, we will discuss about alumina.


What is alumina? Why is the chemical component alumina used in the manufacture of refractory materials, one of which is refractory brick? Check out the following explanation!


What is alumina?


Alumina is a chemical compound with the chemical formula Al2O3, which is composed of aluminum and oxygen. Not only in the refractory industry, alumina is also widely used in the ceramics and glass industries.


Where does alumina come from?


The natural alumina component is obtained from bauxite, a material in the form of sedimentary rock. In Indonesia, several bauxite producing regions are Sumatra, Riau and Kalimantan.


Bauxite will be processed into calcined alumina which is artificial alumina through the bayer process. Not only calcined alumina, artificial alumina includes fused alumina and tabular alumina.


Why does alumina used for fire bricks?


Not only refractory, alumina is a component of most refractory materials. Why? Because alumina has a high melting point, is a good heat insulator, and withstands high temperature stress.


How to get alumina fire bricks?


Loka Refractories provides refractory bricks with various levels of alumina! Those with high alumina content include SK-36 and SK-38 high alumina bricks. Get high alumina refractory bricks at special prices now!


Contact Us!



Phone: 031-7663307 

Whatsapp : 082142808900

E-mail :info@lokarefractories.com

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Loka Refractories on Misi Dagang Jatim Fulfill Refractory Needs in West Nusa TenggaraLoka Refractories on Misi Dagang Jatim, Fulfill Refractory Needs in West Nusa Tenggara
Loka Refractories - Loka Refractories participates in the "Misi Dagang Jawa Timur" in an effort to meet the needs of refractories in the West Nusa Tenggara region.

"Misi Dagang Jawa Timur" was carried out in the City of Mataram on Monday, February 27th 2023 to be precise at Lombok Raya Hotel.

This time, "Misi Dagang Jawa Timur" with the theme "Increasing Connectivity Networks" are attended by the Governor and high-ranking officials of the provincial governments of East Java and West Nusa Tenggara.

On this occasion, Loka Refractories signed an MoU with PT. Detra Adiyasa Putra Mandiri as partner.

The signing of this document marks the beginning of the collaboration between PT. East Java Wira Refractory Workshop with PT. Detra Adiyasa Putra Mandiri in developing the refractory business in West Nusa Tenggara province.

It is hoped that with the signing of the MoU document PT. The Wira Jatim Refractory Workshop can meet the demand for refractory materials in the area.

Source: West Nusa Tenggara Province Trade Office
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What Are Refractories Made Of Find Out More About Silica HereWhat Are Refractories Made Of? Find Out More About Silica Here!
Loka Refractories - Are you curious about what refractory bricks are made of? One of the main raw materials is silica.

In a previous article, we discussed one of the raw materials of fire bricks, which is alumina.

Another main component of fire bricks is silica. Therefore, fire bricks are also called aluminosilicate bricks.

So, what is silica and why is it one of the main raw materials not only for fire bricks but also for most other refractory materials?

What is silica?

Silica is one of the aggregate raw materials for refractory such as fire bricks, mortars, and others.

Having a chemical formula of SiO2, silica is a raw material that is easily obtained and therefore, inexpensive.

Where is silica obtained from?

There are two natural sources of silica, which are quartz and diatomaceous soil that has been calcined.

Natural quartz sand or silica sand comes from the beach, sand clay, or crushed sandstone.

Diatomaceous soil contains silica shells from diatoms (a type of single-celled algae).

Why is silica a raw material for refractory?

Silica is one of the main raw materials for refractory because it is easily obtained and has insulating properties or can withstand heat.

Where can you buy silica-containing refractory bricks in Surabaya?

Loka Refractories, one of the Surabaya refractory brick manufacturers, provides fire bricks containing silica.

We are ready to fulfill the demand for fire bricks produced from raw materials with guaranteed quality.

Do you have any questions about our products? Contact us:
Phone: 031-7663307
WhatsApp: 082142808900
E-mail: info@lokarefractories.com
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Refractory Material Resistance TestRefractory Material Resistance Test

Loka Refractories - In addition to high temperature and pressure resistance, refractory materials must also be resistant to abrasion.


Abrasion itself is damage in the form of erosion of the refractory lining due to friction with the material in the kiln/furnace/boiler.


Refractory damage can hinder industrial processes and cause considerable losses.


Therefore, refractory materials must be tested for abrasion resistance. One of the indicators is Cold Crushing Strength (CCS) or compressive strength.


What is cold crushing strength and how is it tested? Check out the article below!


- What is Cold Crushing Strength?


Cold Crushing Strength or also known as compressive strength is the ability to withstand refractory materials against compression loads at room temperature.


From the CCS test, information is obtained on the strength in transportation, combustion suitability and resistance to abrasion, bulk density and porosity.


There are many standards for conducting CCS tests, one of which is ASTM C133.


- How is the CCS Test Performed?


The CCS test is conducted by placing a molded or mortar refractory stone or refractory cement sample on a special machine.


Then, the sample will be loaded until it reaches the maximum load and cracks (hydraulic compression). The maximum load will be used to calculate the CCS value.


Cold Crushing Strength is also an indicator of abrasion resistance for PT Loka Refractories products.


Get materials that are tested for performance and quality by contacting:


E-mail : info@lokarefractories.com
Phone : 031-7663307, 0821-4280-8500


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