What is ASO-SEM used for?

ASO-SEM is a rapid cementitious screed mortar (CT-C40-F6-A9) for bonded screeds, screeds on separating layers and floating screeds on insulation, in both interior and exterior areas.

How much ASO-SEM do I need?

Approximately 20 kg/m² per 10 mm of screed thickness. A 50 mm screed at 10 m² needs around 1,000 kg, or forty 25 kg bags.

What layer thicknesses can ASO-SEM be laid at?

It can be installed from 10 mm up to 80 mm depending on the construction method (bonded, separated or floating), which suits most residential and commercial screed work.

When can heated screeds with ASO-SEM be turned on?

Heating can be commissioned after 3 days, which dramatically shortens programme times compared with traditional sand-cement screeds.

Is ASO-SEM suitable for tiled finishes?

Yes. ASO-SEM is engineered as a substrate for tiles, stone, resilient floor coverings and bonded waterproofing systems, with C40 compressive strength meeting commercial floor demands.

Schomburg ASO-SEM 25kg rapid-setting engineered screed for fast-drying floor levelling, screeding, and substrate preparation before floor coverings.

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Schomburg ASO-SEM - High-Performance Engineered Screed

Name: Schomburg ASO-SEM - High-Performance Engineered Screed
Brand: Schomburg
SKU: SSCS524
Price: 48.95 AUD
Availability: InStock

$48.95

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ASO-SEM is a high-strength, accelerated cementitious screed mortar designed for rapid construction progress. Packaged in 25 KG bags (Material Number: 206543001), it offers a quick setting time with a pot life of approximately 45 minutes, allowing foot traffic after 14 hours and tile installation after 24 hours. With a compressive strength of approximately 40 N/mm² (DIN EN 13813) and a flexural strength of ≥6 N/mm², ASO-SEM ensures durability while maintaining vapour permeability. Its smooth, easy-to-apply consistency makes it suitable for bonded screeds, separating layer screeds, or floating screeds on insulating layers, with thicknesses ranging from 10 to 80 mm. The material is compatible with both heated and unheated designs and is suitable for interior and exterior applications. With very low emissions (EMICODE EC 1), ASO-SEM is an environmentally friendly choice for construction projects requiring fast turnaround times and high-performance screeds.

Classified CT-C40-F6-A9 to DIN EN 13813 with approx. 40 N/mm2 compressive strength at 28 days

Foot traffic after approx. 14 hours and ready for ceramic tiles after approx. 24 hours

Very low emission EMICODE EC 1 PLUS, for interior and exterior use

Quantity: 1

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Schomburg ASO-SEM - High-Performance Engineered Screed

The Waterproofing Shop

Pickup available, usually ready in 24 hours

22/872 Canterbury Road
Roselands NSW 2196
Australia

+61280213517

Product Details

Key Features & Benefits:

✔ Strengthens & Hardens Concrete – Improves surface density and durability.
✔ Reduces Dust Formation – Creates a cleaner and safer environment.
✔ Enhances Abrasion Resistance – Ideal for high-traffic areas.
✔ Deep Penetration & Long-Lasting Effect – Provides extended protection.
✔ Easy Application & Fast Drying – Ensures quick project completion.

Applications:

✅ Suitable for industrial floors, warehouses, parking structures, and workshops.
✅ Ideal for commercial spaces, retail stores, and public buildings.
✅ Compatible with new and existing concrete surfaces for improved longevity.

ASO-SEM is the perfect solution for professionals looking to increase the lifespan of concrete floors, ensuring a dust-free, hardened surface that withstands daily wear and tear.

How to Use

Mix 25kg with approx. 1.5 L of water for approx. 2 to 3 minutes to a damp earth to stiff plastic consistency, then lay at 10 to 80 mm within the approx. 45 minute pot life.Check the substrate meets the load-bearing capacities of DIN EN 1991-1-1
In water impact classes W0-I to W3-I under DIN 18534, install a suitable SCHOMBURG bonded waterproof system first
Where moisture rises from the substrate, install effective waterproofing before laying the screed
For bonded screeds, abrade and prepare the concrete substrate and brush ASOCRET-HB-FLEX into it
Carry border, field, building separation and movement joints over to the screed and detach them with edge strips
Mix 25kg of ASO-SEM with approx. 1.5 L of water for approx. 2 to 3 minutes to a damp earth to stiff plastic consistency
For machine mixing, half fill the drum with 125kg of ASO-SEM and approx. 10 L of water, then top up with the remaining 125kg and 5 L of water
Apply the screed onto the wet slurry coat, keeping mixing, application and processing in immediate sequence
Size each area so the application can be completed within the approx. 45 minute pot life
Lay to the design layer thickness between 10 and 80 mm
Protect the fresh screed to prevent it drying out too rapidly through heat or draughts
Cut crack control joints in up to a third of the introduced layer thickness
Hold the indoor and floor temperature at a minimum of 5C during application and for the following week, and do not use air dehumidifiers for the first 3 days
Carry out a moisture measurement by the CM method before laying coverings
Allow approx. 14 hours before foot traffic and approx. 24 hours before tiling
Commission underfloor heating after 3 days
Rinse tools with water immediately after use

Technical Specifications

Product Type: Cementitious screed mortar, accelerated, high strength
Classification: CT-C40-F6-A9 after DIN EN 13813
Base Material: Pre-blended dry mortar
Consistency: Powdered
Colour: Cement grey
Grain Size Max: under 4 mm
Bulk Density of Fresh Mortar: approx. 2.1 kg/dm3
Settled Apparent Density: 1.8 kg/dm3
Compressive Strength (28 days, DIN EN 13813): approx. 40 N/mm2
Flexural Strength (28 days, DIN EN 13813): 6 N/mm2 or greater
Reaction to Fire (Directive 96/603/EC): A1fl
Vapour Diffusion Behaviour: Vapour permeable
Emissions: Very low emission, EMICODE EC 1 PLUS
Water Addition: approx. 1.5 L per 25 kg bag
Mixing Time: approx. 2 to 3 minutes
Mixing Method: Forced paddle mixer or free fall mixer
Pot Life: approx. 45 minutes
Substrate Temperature: approx. 5 to 25C
Application Temperature: approx. 5 to 25C
Consumption per m2 and cm Layer Thickness: approx. 20 kg/m2
Layer Thickness: 10 to 80 mm depending on the construction method
Foot Traffic After: approx. 14 hours
Ready for Covering with Tiles: approx. 24 hours
Overcoat After: approx. 24 hours
Heating, Screed After: after 3 days
Hardening Time / Full Resilience: approx. 7 days
Crystalline Water Binding: approx. 6% of its own weight
Suitable Coverings: Tiles, boards, textile covering, parquet, PVC
Packaging: 25 kg bag
Storage: Cool and dry. Min. 12 months in the original unopened packaging
GISCODE: ZP1
pH at 20 C: 11.5 (1%)
Hazard Classification: Danger, GHS05. H315 causes skin irritation, H318 causes serious eye damage
* All values in the technical data sheet apply at 23C and 50% relative humidity. Schomburg declares the DIN EN 13813 classification and the EMICODE rating; no accredited test report number is quoted in the TDS

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Schomburg ASO-SEM - High-Performance Engineered Screed

$48.95

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Schomburg ASO-SEM - High-Performance Engineered Screed $48.95

Technical overview

ASO-SEM is an accelerated, high strength cementitious screed mortar supplied as a pre-blended dry mortar. It is used to produce rapid setting cement-based screeds as bonded screeds, separating layer screeds or floating screeds on an insulating layer, in heated and unheated designs, for interior and exterior use, at layer thicknesses of 10 to 80 mm. Foot traffic is possible after approx. 14 hours and the screed is ready for tiles after approx. 24 hours. Schomburg classifies it CT-C40-F6-A9 after DIN EN 13813 and declares it very low emission to EMICODE EC 1 PLUS. No accredited test report number is quoted in the technical data sheet.

View full technical data sheet

Key applications

Producing rapid setting cement-based screeds
Bonded screeds
Separating layer screeds
Floating screeds on an insulating layer
Heated and unheated screed designs
Interior and exterior use
Screed base for tiles, boards, textile covering, parquet and PVC
Screeds in water impact classes W0-I to W3-I to DIN 18534 where a suitable SCHOMBURG bonded waterproof system has been applied

Surface suitability

Concrete (abraded and prepared, with ASOCRET-HB-FLEX brushed in and the screed applied to the wet slurry coat)
Any substrate meeting the load-bearing capacities of DIN EN 1991-1-1
Separating layer (screed laid as a separating layer screed)
Insulating layer (screed laid as a floating screed)
Substrates in water impact classes W0-I to W3-I to DIN 18534 (only where a suitable SCHOMBURG bonded waterproof system has been applied)
Substrates with rising moisture (effective waterproofing essential before laying the screed)

The indoor temperature and floor temperature must be at least 5C during application and for the following week, and the substrate and application temperature is approx. 5 to 25C. The installation location must be ventilated, but draughts and direct solar radiation must be avoided during application and hardening, and air dehumidifiers may not be used during the first 3 days. Do not add any other cement or binder. Water pressed out of the surface indicates excessive water addition above 1.5 L per 25kg; ASO-SEM can crystalline bind only approx. 6% of its weight to water and any excess must evaporate, delaying readiness to receive tiles and boards. Low temperatures, high humidity and heavy layer thicknesses delay hardening and drying. A moisture measurement must be carried out using the CM method to assess readiness. If moisture rises from the substrate, effective waterproofing is essential before laying the screed. Border, field, building separation and movement joints must be carried over or installed and detached with edge strips, and crack control joints cut in up to a third of the layer thickness. This product is classified Danger: H315 causes skin irritation and H318 causes serious eye damage. Wear protective gloves, protective clothing and eye and face protection.

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Schomburg ASO-SEM - High-Performance Engineered Screed

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Technical Specifications

Product Type	Cementitious screed mortar, accelerated, high strength
Classification	CT-C40-F6-A9 after DIN EN 13813
Base Material	Pre-blended dry mortar
Consistency	Powdered
Colour	Cement grey
Grain Size Max	under 4 mm
Bulk Density of Fresh Mortar	approx. 2.1 kg/dm3
Settled Apparent Density	1.8 kg/dm3
Compressive Strength (28 days, DIN EN 13813)	approx. 40 N/mm2
Flexural Strength (28 days, DIN EN 13813)	6 N/mm2 or greater
Reaction to Fire (Directive 96/603/EC)	A1fl
Vapour Diffusion Behaviour	Vapour permeable
Emissions	Very low emission, EMICODE EC 1 PLUS
Water Addition	approx. 1.5 L per 25 kg bag
Mixing Time	approx. 2 to 3 minutes
Mixing Method	Forced paddle mixer or free fall mixer
Pot Life	approx. 45 minutes
Substrate Temperature	approx. 5 to 25C
Application Temperature	approx. 5 to 25C
Consumption per m2 and cm Layer Thickness	approx. 20 kg/m2
Layer Thickness	10 to 80 mm depending on the construction method
Foot Traffic After	approx. 14 hours
Ready for Covering with Tiles	approx. 24 hours
Overcoat After	approx. 24 hours
Heating, Screed After	after 3 days
Hardening Time / Full Resilience	approx. 7 days
Crystalline Water Binding	approx. 6% of its own weight
Suitable Coverings	Tiles, boards, textile covering, parquet, PVC
Packaging	25 kg bag
Storage	Cool and dry. Min. 12 months in the original unopened packaging
GISCODE	ZP1
pH at 20 C	11.5 (1%)
Hazard Classification	Danger, GHS05. H315 causes skin irritation, H318 causes serious eye damage
* All values in the technical data sheet apply at 23C and 50% relative humidity. Schomburg declares the DIN EN 13813 classification and the EMICODE rating; no accredited test report number is quoted in the TDS

Frequently asked questions

View all FAQs

What is ASO-SEM used for?

Application
ASO-SEM is a rapid cementitious screed mortar (CT-C40-F6-A9) for bonded screeds, screeds on separating layers and floating screeds on insulation, in both interior and exterior areas.
How much ASO-SEM do I need?

Coverage & Coats
Approximately 20 kg/m² per 10 mm of screed thickness. A 50 mm screed at 10 m² needs around 1,000 kg, or forty 25 kg bags.
What layer thicknesses can ASO-SEM be laid at?

Application
It can be installed from 10 mm up to 80 mm depending on the construction method (bonded, separated or floating), which suits most residential and commercial screed work.
When can heated screeds with ASO-SEM be turned on?

Cure & Dry Time
Heating can be commissioned after 3 days, which dramatically shortens programme times compared with traditional sand-cement screeds.
Is ASO-SEM suitable for tiled finishes?

Compatibility
Yes. ASO-SEM is engineered as a substrate for tiles, stone, resilient floor coverings and bonded waterproofing systems, with C40 compressive strength meeting commercial floor demands.

Why trade professionals choose Schomburg

Schomburg is a German building chemicals brand supplied to the Australian trade, covering rising damp treatment, screeds, repair mortar and tile adhesive. The range stocked here runs from the AQUAFIN-F and AQUAFIN-i380 damp course products through to SOLOPLAN-30 self-levelling compound, ASO-SEM engineered screed, ASOCRET5/40 repair mortar and MONOFLEX-XL tile adhesive. It is a practical selection for remedial and preparation work, where getting the substrate right decides whether the finished floor or wall holds up.

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