Initial Surface Absorption Apparatus Manufacturer,Supplier and Exporter in India
Product Code : TVT-CTE-10501
The Initial Surface Absorption Apparatus assesses the surface water absorption characteristics of hardened concrete by measuring the rate of flow of water per unit area into the concrete surface under a constant head.
How It Works
A cap is sealed onto the concrete surface under test and filled with water to a constant head of 200mm; the rate at which water flows into the concrete surface is measured over set time intervals (typically at 10 minutes, 30 minutes, 1 hour and 2 hours from the start of the test), giving the Initial Surface Absorption (ISA) value used to judge the surface permeability and likely durability of the concrete.
Technical Specifications
| Parameter | Specification |
|---|---|
| Test Head | Constant 200 mm water head |
| Dimension | 666 (L) x 284 (W) x 637 (H) mm |
| Approx. Weight | 13 kg |
Applications
Used to assess the surface absorption/permeability of hardened concrete per BS 1881-208 (Initial Surface Absorption Test), commonly specified for durability assessment of concrete exposed to weathering, marine environments, or chloride/sulfate attack.
Related Products & Category
Browse the full Concrete Testing Equipments range, or see Digimatic Concrete Impermeability Apparatus and Surface Grinding Machine.
Frequently Asked Questions
What does the Initial Surface Absorption Test measure?
It measures the rate of water flow into a concrete surface under a constant 200mm head, used as an indicator of the concrete’s surface permeability and likely durability.
How is this different from the Impermeability Apparatus?
The Impermeability Apparatus (EN 12390-8) measures water penetration depth under pressure through a full specimen, while the Initial Surface Absorption Apparatus measures surface-level water absorption under a low constant head per BS 1881-208 — both assess durability-related permeability but via different mechanisms.
What readings are typically taken during the test?
Absorption readings are typically taken at set time intervals from the start of the test (commonly 10 minutes, 30 minutes, 1 hour and 2 hours) to plot the ISA value over time.
Request a Quote
To get a quotation for the Initial Surface Absorption Apparatus, tell us the test standard you work to, the quantity and the delivery location. Request a quote from Tvet Equipments.
Last updated: September 2026
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