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Plastic Molds Used for Producing Concrete Spacers

Plastic molds made of PP plastic for casting concrete spacers, which have the cube shaped. Depending on mold design, the concrete spacers have the different heights.

Concrete spacer mold made the concrete block, there are two plane and four sides and both have grooves. Each spacer has many specifications (20mm, 30mm, 35mm, 40mm…), and each center of concrete block can be put in wire.

Concrete spacers are used to secure the reinforcement steel rebar in concrete structures as the rebar is assembled […]

Solution of Concrete spacer 60mm & 75mm in civil construction

With the construction of finished floor panels 100mm – 110mm-120mm, people often use granite stone to insert the bottom, and break down the steel to insert between lower and upper.

Currently, NLSG Company uses a concrete spacer 15/20 mm to insert at bottom and a concrete spacer 60mm or 75mm to insert at the above steel frame to:

Ensure the structural design of the steel frame
Dimension and quality are stable
Limit the phenomenon of “steel fire”, “steel hammock” in construction.

Let’s take a […]

Guide to select and use concrete spacers

Concrete spacers (Concrete rebar support) are a construction accessories material help maintain material integrity and uniformity of the concrete, and provide a cover over the reinforcement that protects against corrosion.

Standard of using Ngoc Lam Sai Gon concrete spacers as below:

Single Cover Concrete Spacers

Single Cover Concrete Spacers are manufactured for 1 size with high strength, and are as strong as the surrounding concrete. They have a wide base for maximum stability when used as recommended for horizontal applications such as […]

Why we choose to use concrete spacers over those made of plastic, granite stone…?

Plastic spacers

Plastic spacers do not bond well with concrete. When the concrete is poured into the form, a small gap is created between it and the plastic. Plastic has a coefficient of thermal expansion and contraction 10 to 15 times that of concrete, and when subjected to temperature variations, the plastic continues to expand and contract at that higher coefficient. At high temperatures, plastic can even melt. The result is a separation between the spacers and the poured concrete, […]

Cover blocks

Cover blocks overview

What are cover blocks?

Cover blocks are used to maintain a specified
distance between the TMT rebar and the
shuttering. (Cover blocks for slab)




Why we must use cover blocks?

– 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
– Thus […]