Synesis markets its cellular lightweight concrete (CLC) block under “S-Block” brand. S-Block is an engineered low-density material made from cement, sand, water, and millions of small air pores (bubbles). The small, strong air pores or bubbles in S-Block Lightweight Concrete are made using foaming agent, which flows through a foam generator - creating mechanically manufactured bubbles. This “foam” is then blended with a cement slurry or cement sand mix. It is these small air bubbles or pores in combination with our own specially designed production equipment that gives our lightweight material its unique set of properties.


Low Water Absorption Can use normal mortar

Easy to Use

By using normal mortar/plaster, contractors do not need special training or use special equipment to install S-Block – they can use the same procedure/equipment as they used for bricks/normal weight block.

  S-Block can be used in wet areas like bathrooms
No Problems using S-Block in areas of high humidity or rain

With low water absorption, S-Block has no problems with moisture passing though the wall – so wallpaper adhesion, electrical shorts, and moist walls are not potential problems. AAC blocks have high water absorption (typically 30-40%), so moisture can pass through the wall easily - causing various and troublesome problems.

No need for a bottom course of normal weight block (as seen in some projects when AAC blocks are used)
Low In-Place Thermal Conductivity

1% water in a material adds 5% to that materials thermal conductivity value. S-Block has low absorption; therefore, its in-place performance is similar to lab results. Some lightweight blocks have high water absorption (30-40%) so in-place performance can be very different from what the laboratory results would suggest.

Closed Cell Structure

Excellent Heat or Fire Insulation

Since the air bubbles are not connected, heat is forced to travel from air to cement matrix many times - losing more energy than if it could travel through connected cells (as with AAC Blocks), resulting in excellent insulation and fire ratings.

Excellent Sound Protection
Excellent Heat or Fire Insulation

Since the S-Block air bubbles are not connected (closed cells), sound waves loss a lot of energy going from air to matrix many times, plus the value of air in reducing sound energy – resulting in excellent sound protection. With open cell structures (like AAC blocks, and normal weight blocks), sound can pass from one cell to another without loss of much energy.

Strong Air Bubbles
Little Settlement

For other applications – this means S-Block Lightweight Concrete settles very little in formwork or molds (that is cast-in-place applications) and S-Block is very stable when mixed, poured from high heights or pumped.

Small Air Bubbles
Excellent Screw Adhesion (High pullout strength)

Since the air bubbles in S-Block are very small (usually smaller than the thread of the screw) screws hold well – high pullout strengths. For other lightweight blocks, the air bubbles are large – so that if the screw moves (through load or vibration), the screw can break into a large air bubble and become loose.

Larger and Lighter Block
Faster Construction

Lightweight and large block size making construction faster.

Block Sizes and Comparison

Block Sizes
7cm 20cm 60cm 8.3 Blocks
9cm 20cm 60cm 8.3 Blocks
14cm 20cm 60cm 8.3 Blocks
17cm 20cm 60cm 8.3 Blocks
21cm 20cm 60cm 8.3 Blocks
28cm 20cm 60cm 8.3 Blocks

Cost Comparison
Installing 1 M2 of wall (10cm thick)
Description S-Block (7cm) Normal Brick
Quantity Price (Kip) Quantity Price (Kip)
Price per 1 M2 8 pieces 40,000 66 pieces 19,800
Price of sand used for building 1 M2 of wall 9.9 kg 428 23.81 kg 1,133
Price of sand used for plastering 1 M2 of wall 41.15 kg 1,714 41.15 kg 1,714
Price of cement used for building 1 M2 of wall 3.89 kg 4,279 10 kg 11,000
Price of cement used for building 1 M2 of wall 16.12 kg 17,732 16.12 kg 17.732
Labor cost   55,000   75,000
TOTAL   119,153   126,379