Heavy duty compression testing machine


The main features of our concrete specimen crushing machines are:

  • Class 1 accuracy according to ISO 7500-1.
  • Machines are in conformity with EN 12390-4, ASTM C39 standards.
  • Automatic load rate adjustment according to EN 12390-3 standards.
  • Heavy duty 4-column load frame supported by solid head and foot platens.
  • CE conformity for the safety of the operator
  • Suitable for testing 150 mm or 200 mm cubes and Ø 150x300 mm cylinder concrete samples.
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Cost-effective compression testing machine


The main features of our concrete specimen crushing machines are:

  • Manufactured by heavy-duty welded steel loading frame.
  • High accuracy of 0.5 to 1.0 %, Class 1 according to the EN ISO 7500-1.
  • Automatic load rate adjustment according to EN 12390-3 standards. Also in conformity with EN 12390-4, ASTM C39 standards.
  • All processes and operations are performed via a 7’’ Touch Screen Display, while the system prints the test results for each specimen on a dedicated thermal printer.
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Retrofitting of an Old Concrete Press


We offer you the ability to convert your existing compression testing machine in order to be in conformity with the EN 12390-4 requirements. By keeping your old press frame and installing our kit, you will able to perform the crushes of your specimens fully automatically at the preset load rate while the accuracy of your strength results (MPa) will increased to the highest possible level.

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Curing Tanks


The curing tank is designed for curing concrete cubes and cylinders, in conformity with the EN 12390-2, ASTM C3, C192, C511 standards.

Maintaining a stable and uniform temperature and preventing loss of moisture from the specimen are provided by our system.

The water temperature can be adjusted and can be kept constant by an electric heater and a thermostat to standard value of 20 ± 2 °C. A circulation pump ensures uniform curing conditions to all specimens.

Tanks made of polyethylene (most common), steel or stainless steel, ranging following maximum capacities:

  • 390 pcs cubes 150mm / 195 pcs cylinders Ø 150 X 300 mm
  • 220 pcs cubes 150mm / 110 pcs cylinders Ø 150 X 300 mm
  • 135 pcs cubes 150mm / 77 pcs cylinders Ø 150 X 300 mm

All our models are supplied with steel stand, thermostat controlled heater, submersible circulation pump and bottom racks.

Removable upper rack and tong are offered separately.


Slump Test

The Slump test method is used for the determination of the freshly mixed concrete consistency.

We offer a complete set made of galvanized steel, that consists of:

  • Slump Cone
  • Slump Cone Funnel
  • Base Plate
  • Tamping Rod which is hemispherical at both ends
  • Rubber Mallet
  • Steel Ruler

The equipment is in conformity with the EN 12350-2 standards.


Air Entrainment Meter

Lightweight and compact air content apparatus

The apparatus is used to determine the air content of fresh concrete. It consists of an aluminum cylindrical vessel with airtight cover assembly incorporating an air pump, a pressure gauge and valves.

Capacity is 7 Lt and Air content range is 0 - 100%. The meter measures up to 22% entrained air, not affected by changes in atmospheric pressures.

Direct pressure gauge reading (Ø 90 mm) to the nearest 0.1% up to 6%, 0.2% from 6 to 8% and 0.5% from 8 to 10%.

The instrument can be calibrated and it is supplied complete with Tamping Rod and Straight Edge.

Carrying Case should be ordered separately.



Unit Weight Measures

Unit Weight Measures are used to determine the weight per cubic meter of freshly mixed and compacted concrete.

Available in 10 lt capacity, it is manufactured from 4mm heavy gauge steel coated against corrosion, with a 200mm diameter and 320 mm height. 

It confirms to EN 12350-6 standards.  Also available in 3, 7, 15 and 30 liter capacity models according to the requirements of different Standards.


Concrete Cube Moulds

Cube moulds for concrete samples according to the EN 12390-1 are available in 3 types:

A) Cast iron moulds for cubes 150 X 150 X 150 mm

B) Heavy-Duty Plastic moulds for cubes 150 X 150 X 150 mm

C) Plastic moulds for cubes 150 X 150 X 150 mm

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Automatic sieve shaker

PROTEM’s Sieve Shaker is a cost-effective and fully automatic device, suitable for D200 and D300 sieves placed on top of each other. Fitted with a very efficient clamping device that ensures sieves are held firmly without over-tightening and allows them to be quickly removed and replaced. The machine is in compliance with the standards EN 933-5 | ISO 565, 3310-1, 3310-2.

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Sand Equivalent Test

Sand Equivalent Test Set is used to determine the fines of aggregates. The Sand Equivalent Test Set complete with siphon assembly (irrigator tube with valve, rubber stopper, siphon tube and hose, blow tube), weighted foot assembly, funnel, measuring can, 5 lt capacity sand jar and a carrying case.

Supplied with two Sand Equivalent Measuring Two Graduated Cylinder for EN Model and two Sand Equivalent Measuring Graduated Cylinder for ASTM Model.



Methylene Blue Test

Methylene Blue Test Set is used for determining clay content in the fines fraction of the aggregates.

Set consists of 400/600 rpm. Electric stirrer, complete with Ø 75 mm stirring propeller, support base for stirrer, 50 ml glass burette, burette holder, support base for burette, Ø 125 mm Filter Papers (pack of 100), Ø 8*300 mm glass rod, 2000 ml capacity plastic beaker, 100 gr methylene blue and 500 gr kaolinite.



Laboratory drying oven

Laboratory Drying Ovens have been designed for drying asphalt, soil, rock, concrete, aggregate or similar materials. Available in different capacities, ranging from 50 to over 1000 Lt. The most common type of oven has a capacity of 120 Lt, outer dimensions of 80x85x104 (LxWxH) andis fan circulated with a digital control system of ±2°C, 230V/50-60Hz/1Ph.

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Sand Absorption Test


Used in determining the specific gravity and absorption of fine aggregates.  The equipment is made from galvanized steel for protection against corrosion. The set consist of Abrams Cone and tamper.

Equipment confirms to EN 1097-6 standards.


Moisture Analyzers

Moisture analyzers are used for quick and precise determination of material humidity upon the basis of weight loss during drying of its small sample (thermo-gravimetrical method).

Halogen radiators ensure effective and fast sample drying, while a high accuracy load cell constantly calculates the weight difference between humid and dry sample. As a result the moisture analyzer calculates the final percentage of humidity for a material sample.

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Concrete (Schmidt) Test Hammer

This concrete test hammer, has aluminum frame, and thanks to its very accurate manufacture processing and selected components ensures high precision test results in the time.

The quality of concrete is mainly judged by its compressive strength directly affecting the load-bearing capacity and durability of concrete structures.

Using the test hammer it is very easy to directly determine the load bearing capacity and durability of concrete structures having strength resistances from 10 to 70 N/mm². Hammer’s spring impact energy is 2,207 Nm (Joule).

The equipment is supplied completed with calibration curve chart in N/mm² (Mpa) values, abrasive stone and carrying case. Calibration Anvil, used for the verification of the calibration of the hammers.

STANDARDS: EN 12504-2, 13791; ASTM C 805; BS 1881:202

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Protem Group S.A.

3, 35th Str., 133 41 Industrial Park
Ano Liossia / Athens, Greece
Τ. +30 210 5716500
F. +30 210 5710008
GCR No: 7633901000