astro concrete spacers

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About us

ASTRO FIBER CONCRETE SPACERS is a brand of Abhirami Enterprises a "young" manufacturing entity located in a prime industrial hub in Chennai, India. Replete with sophisticated machinery, we follow the best of ethics associated with our manufacturing process. Our range of Fibre Reinforced Concrete Cover Blocks go through rigorous quality control measures that ensure the customers get the best. Our products are currently being exported to GCC countries in a big way. We also cater to leading construction giants within India like Larsen & Toubro (L & T), Shapoorji Palloonji, Simplex Infra Structures (Metro Rail, Chennai).

Our Production Process

ASTRO is fully equipped to roll out Cover Blocks to perfection. Our moulds are precision made to manufacture products with absolute uniformity across every size cast. Our admixtures & special additives have helped us derive a Compressive Strength in excess of M-70, one of the highest in India. As of now, we have an installed capacity to deliver more than 1.2 million pieces per month.

  • Planning 85%

  • Design 75%

  • Development 88%

  • Delivery 95%

Quality Assurance

Our products go through frequent tests by competent agencies in order to maintain quality with consistency. Our products have also been tested abroad by our overseas clients & have achieved desired results.

Why You Should Use Fiber Concrete Spacers In R.C.C Structures?

A cover block is basically a spacer that is used to lift the rebar matrix off the ground so that concrete may flow below the rebar.

When doing RCC work it is important to embed the steel in the concrete (also known as cover) so that the rebar doesn’t corrode and to provide fire protection to the rebar If we don’t provide the recommended cover the rebar will corrode with time and will ultimately result in premature failure of the structure. Thus using cover blocks enhances the life of the structure significantly without adding much to the cost.

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Concrete Spacer Bonds with Concrete

Advantages of Fiber Concrete Spacers









  • Easy to install with binding wire, clips etc.

Disadvantages of Polypropylene and PVC Spacers

Getting the right amount of Fiber Concrete Spacers is essential for the durability of reinforced concrete structures. Fiber Concrete spacers ensure correct Fiber Concrete Spacers before and during concreting. They are characterized by high compressive strength and excellent chemical and physical resistance.

The spacers fulfil the requirements of all exposure classes. All recipes used are tested by independent testing institutes with regard to the required properties.

Fiber Concrete Spacers prevent rebar's from corrosion, protect them from fire to certain length of time and help to provide proper transfer of stresses from concrete to steel rebar's, by helping provide proper cover to rebar's. Fiber Concrete spacers are made from high strength, Fiber Reinforced Concrete in a factory with strict quality control.

  • High density with low porosity

  • High load-bearing capacity

Fiber Concrete Spacers are better since they can easily bond with the poured concrete, Since Fiber Concrete spacers have similar thermal expansion properties as the surrounding concrete, the likelihood of cracks forming between the spacer and concrete is significantly reduced.


Consequences of using plastic spacers instead of concrete spacer. Vulnerable to corrosion and the concrete to early deterioration.

Disadvantages of cover blocks made at site

PVC spacers are also available but these are foreign body materials to concrete, fails to essentially form a permanent bond with concrete. Thermal coefficient of expansion is different with concrete.

Fiber Concrete Spacers have better bonding with surrounding concrete as it is made from the same material. Any gap between the PVC and CC to the structure will permit water seepage, ultimately the steel will get corroded or loose its strength and purpose.

Due to this hair cracks develop between plastic and concrete surface, which allow entry of corrosive gases, which in turn accelerates corrosion.

The use of plastic spacers should be avoided to as extent as possible. The PVC blocks will not be removed from the structure before plastering, hence in case of fire they will melt down and building will be at risk.

While the very purpose of this is beaten, they do not offer any strength besides being porous seriously impacting the very strength of the constructed structure. In accordance with BS 8110-1, concrete spacers shall not be made on the construction site. Furthermore, site made spacers allow ingress of water vapor and gases  and their  strength is below 10 Mpa.



ASTRO Fiber Concrete Spacers are manufactured using Cement, aggregate, M-sand, plasticizers, imported poly fiber & special admixtures to achieve compressive strength in excess of M-70. Our products go through rigorous testing processes at periodical intervals to ensure conformity to international standards.


Solid as a Rock Strength

ASTRO Fiber Concrete Spacers are made under severe quality control, bearing compressive strength not less than 60 MPa. Consequently, no deformation in heat, cold or under weight, subjected before and during concreting.

ASTRO’s Durability

ASTRO Fiber Concrete Spacers are highly durable to structure containing very low chloride penetration and over 100 years life based on strict International tests.

ASTRO’s Identification

ASTRO Fiber Concrete Spacers sizes are clearly embossed on every spacer size (in metric as well as in imperial unit). The extruded spacers will not bear this feature.

ASTRO’s Precision

ASTRO Fiber Concrete Spacers are casted in precision dies, Certifies precise dimensions well under prescribed tolerances.

ASTRO’s Quality and Standards

ASTRO Fiber Concrete Spacers are manufactured strictly in accordance with ISO 9001:2015 (Certified by: UQSR under registration no. UQSR-1251-AE. All our spacers confirm to British Standards H BS 7973-1:2001, DIN 1045 and EN 206. Tests prove that our spacers exceed breaking load limits stipulated in DBV Merkblatt Abstandhalter (L2)