Compression testing service

Comprehensive Compression Testing Service – Accredited Strength and Stiffness Assessment for Materials and Components

For Bangladeshi importers, manufacturers, and quality engineers in the construction, packaging, automotive, and industrial sectors, verifying the compressive strength, modulus, and deformation behaviour of materials is essential for product design, quality control, and regulatory compliance. Our ISO/IEC 17025 accredited laboratory offers a complete compression testing service that accurately measures the response of materials to compressive forces – from concrete and masonry to plastics, rubber, metals, and composites. With decades of experience in mechanical testing and failure analysis, we help you qualify raw materials, verify finished products, and meet the stringent requirements of the Bangladesh Standards and Testing Institution (BSTI), the Public Works Department, and international standards such as ASTM, ISO, BS, and EN.

Product Samples We Regularly Test

We accept a broad range of materials and components that are subject to compressive loads in service. Our testing machines are equipped with various platens, fixtures, and environmental chambers to accommodate different specimen sizes, shapes, and test conditions. Common samples include:

• Concrete and cementitious materials – cubes, cylinders, cores, and mortar specimens.
• Masonry units and assemblages – bricks, blocks, stone, and mortar prisms.
• Metals and alloys – cylindrical or prismatic specimens for yield and ultimate strength determination.
• Plastics and polymers – rigid plastics, foams, elastomers, and composite materials.
• Packaging materials – corrugated board, paper tubes, plastic bottles, and shipping containers.
• Rubber and elastomeric components – seals, gaskets, vibration mounts, and O‑rings.
• Wood and timber products – structural lumber, plywood, and engineered wood products.
• Powders and granular materials – for compaction and bulk density characterisation.
• Ceramics and refractories – tiles, insulators, and high‑temperature components.

Construction and Building Materials Compression Testing

Compression testing is fundamental for quality control in the construction industry. Our compression testing service provides accurate strength data for concrete, masonry, and other structural materials:

• Concrete cube and cylinder compression test (BS EN 12390‑3, ASTM C39, ISO 4012) – We test concrete cubes (150 mm or 100 mm) and cylinders (150 mm diameter × 300 mm long) to determine their compressive strength. The specimen is placed between steel platens and loaded at a specified rate (typically 0.2‑0.4 MPa/s for cubes, 0.15‑0.35 MPa/s for cylinders) until failure. We report the maximum load and the calculated compressive strength in MPa. The test is performed on specimens cured under controlled conditions (e.g., water‑cured at 20°C).
• Concrete core compression test (ASTM C42, BS EN 12504‑1) – For existing structures, we test cored specimens taken from the hardened concrete. The core is capped or ground to provide parallel surfaces, and then tested in compression. The results are used for in‑situ strength assessment and structural evaluation.
• Masonry prism compression test (ASTM C1314, BS EN 1052‑1) – We build prisms of brick or block masonry using mortar and test them in compression to determine the compressive strength of the masonry assembly. The test provides a direct measure of the structural capacity of the masonry wall.
• Mortar and grout compression test (ASTM C109, BS EN 196‑1) – We prepare mortar or grout cubes (50 mm) and test them in compression to verify the strength of the cementitious matrix, which is critical for quality assurance in construction.
• Aggregate crushing value (ACV) test (BS 812‑110, ASTM C131) – For aggregates used in concrete and road construction, we measure the resistance to crushing under a gradually applied compressive load, providing an indicator of aggregate quality and durability.

Compression Testing for Polymers, Elastomers, and Plastics

Plastic and elastomeric materials are widely used in seals, gaskets, pipes, and structural components. Our service includes standard and customised compression protocols:

• Compressive properties of rigid plastics (ASTM D695, ISO 604) – We test standard specimens (e.g., 12.7 mm diameter × 25.4 mm long cylinders) at a crosshead speed of 1.3 mm/min. We record the load‑displacement curve and calculate the compressive strength (at yield or break), compressive modulus (slope of the elastic region), and deformation at failure. The test is performed at room temperature and, if required, at elevated or reduced temperatures.
• Compression set of rubber and elastomers (ASTM D395, ISO 815) – We compress a cylindrical specimen (e.g., 29 mm diameter × 12.5 mm thick) to a defined strain (e.g., 25% or 50%) for a specified time and temperature (e.g., 70°C for 22 hours). After releasing the load, we measure the permanent deformation (compression set) – a key indicator of seal performance and material recovery.
• Compression stress‑strain of cellular materials (foams – ASTM D3574, ISO 3386) – For flexible and rigid foams (polyurethane, polyethylene, etc.), we compress the specimen to 50% or 75% of its original thickness and measure the force‑deflection curve. The compression modulus, compressive strength, and hysteresis are reported.
• Creep compression and stress relaxation (ASTM D2990, ISO 899‑2) – For polymers that exhibit time‑dependent behaviour, we apply a constant compressive load (or strain) and monitor the deformation (or load decay) over time. The creep compliance or stress‑relaxation modulus is calculated, providing data for long‑term design.
• Heat deflection under compression (HDT – ISO 75, ASTM D648 with compression fixture) – We measure the temperature at which a plastic specimen deflects by a specified amount under a given compressive load, indicating the upper service temperature limit for compression‑loaded parts.

Metallic Materials Compression Testing

For metals, compression testing is often used for ductile materials that are difficult to test in tension, or for determining compressive yield strength:

• Compression test for metallic materials (ASTM E9, ISO 4506) – We test cylindrical or prismatic specimens with a length‑to‑diameter ratio of 2:1 to 3:1. The test is performed at a constant strain rate (or crosshead speed), and we measure the yield strength (0.2% offset), compressive modulus, and ultimate compressive strength. The load‑displacement curve is recorded, and the specimen is inspected for buckling or barrelling.
• Compression testing for ductile metals – such as aluminium, copper, and low‑carbon steel – For these materials, the compressive strength often exceeds the tensile strength. We provide a true stress‑strain curve corrected for friction and deformation, which is valuable for forming simulation and finite‑element analysis.
• Brinell and Rockwell hardness correlation with compressive yield strength (ASTM E10, ASTM E18, custom) – We can perform hardness testing on the same material and provide a correlation with the compressive yield strength, as a non‑destructive alternative for quality control.
• High‑temperature compression testing for superalloys and refractory metals (ASTM E209, ISO 783) – We use a furnace or radiant heating system to test materials at elevated temperatures (up to 1,200°C) in vacuum or inert atmosphere. The hot compression strength and strain‑rate sensitivity are measured.
• Cold compression and cryogenic testing (down to ‑196°C – ASTM E9, custom with cryogenic chamber) – For materials used in cryogenic applications (e.g., LNG storage), we perform compression tests at low temperatures to verify that the material retains ductility and does not become brittle.

Packaging and Container Compression Testing

For the packaging industry, compressive strength is vital for stackability and transport integrity. Our service includes testing of complete packages and components:

• Corrugated box compression test (ASTM D642, ISO 12048, TAPPI T804) – We place a complete box between two platens and apply a compressive force at a constant rate (typically 12.5 mm/min) until failure. The maximum load (box compression strength) and the deflection at failure are reported. The test is performed on both dry and conditioned boxes (e.g., 50% RH, 90% RH) to evaluate the effect of humidity.
• Bottle and container top‑load testing (ASTM D2659, ISO 8113) – We apply a compressive load to the top of plastic bottles, glass jars, or cans until they deform or collapse. The test simulates the stacking of containers during storage and transportation.
• Tube and cylinder crush testing (ASTM D1164, ISO 2872) – We place paper tubes, cardboard cores, or plastic cylinders between parallel platens and compress them radially or axially to measure the crush strength, which is essential for product roll cores and shipping tubes.
• Burst and crush resistance of cans and drums (ASTM D2659, UN pressure tests) – For metal and plastic drums, we apply an axial compression to simulate stacking loads, and we measure the deflection and any permanent deformation.
• Stacking and load stability simulation – using multiple boxes and weight distribution – We perform tests with multiple boxes stacked to simulate palletised loads, measuring the cumulative deformation over time and the stability of the stack.

Advanced Compression Testing – Environmental and Dynamic Conditions

We offer compression testing under a variety of conditions to simulate real‑world service environments:

• Temperature‑conditioned compression testing (ASTM D695, ISO 604 – with environmental chamber) – We condition the specimen at the desired temperature (e.g., ‑40°C, +70°C, +150°C) and perform the compression test within the same chamber, measuring the effect of temperature on strength and modulus.
• Humidity‑conditioned compression testing (ASTM D618, ISO 291 – with humidity chamber) – For hygroscopic materials (wood, paper, nylon), we condition specimens at various RH levels (e.g., 30%, 50%, 90%) and test them to evaluate moisture‑dependent properties.
• Strain‑rate and high‑speed compression testing (ASTM D1621, ISO 844 – using servo‑hydraulic machines) – We perform compression tests at crosshead speeds from 1 mm/min to 500 mm/min to characterise the strain‑rate sensitivity of materials (e.g., for impact‑absorbing foams and crash‑worthy structures).
• Cyclic compression and fatigue testing (ASTM E2126, ISO 21581) – We apply repeated compressive loading (e.g., 1,000 to 100,000 cycles) at a fraction of the ultimate strength to evaluate the fatigue endurance of structural components and resilient materials.
• Creep and stress‑relaxation under compression (ASTM D2990, ISO 899‑2, over long durations) – We apply a constant load or strain for extended periods (e.g., 1,000 hours) at controlled temperature and humidity, measuring the time‑dependent deformation or load decay. This is critical for seal design and long‑term structural assessment.

Geotechnical and Powder Compression Testing

We also provide compression testing for soils, aggregates, and powders, supporting civil engineering and materials processing:

• Unconfined compression test for cohesive soils (ASTM D2166, BS 1377‑7) – We prepare cylindrical soil samples and compress them axially at a specified rate until failure. The unconfined compressive strength is used for foundation design and stability analysis.
• Consolidation (oedometer) test (ASTM D2435, BS 1377‑5) – We compress a soil specimen in a confined ring and measure the settlement under incremental loading, providing the compression index, swelling index, and coefficient of consolidation for settlement prediction.
• Powder compaction and tablet crush testing (ASTM E2033, USP <1217>) – For pharmaceuticals and powdered materials, we compress a known mass of powder into a tablet or pellet and measure the force required to crush it, which is a key quality attribute for pharmaceuticals and ceramics.
• Bulk density and compressibility of powders and granules (ASTM D6683, ISO 10545) – We use a compression tester with a die and punch to measure the relationship between applied pressure and density, which is essential for powder processing and storage.

Fixturing, Alignment, and Compliance

Accurate compression testing requires careful preparation and measurement. Our laboratory follows rigorous protocols to ensure data integrity:

• Specimen preparation and dimensional measurement (ASTM D618, ISO 291, ASTM E8) – We measure the specimen dimensions (length, diameter, thickness) at multiple points using micrometers or callipers to calculate the cross‑sectional area accurately. For anisotropic materials, we note the orientation of the specimen relative to the applied load.
• Platen alignment and parallelism verification (ASTM E4, ISO 7500‑1) – We ensure that the compression platens are parallel and aligned with the load axis using dial indicators or laser alignment tools, preventing eccentric loading that could cause premature or invalid failure.
• Load cell and displacement transducer calibration (ASTM E74, ISO 7500‑1) – All force and displacement sensors are calibrated annually with traceable standards, and we perform daily verification using certified reference masses.
• Lubrication and friction correction (for metals – ASTM E9, using PTFE or grease) – For metallic compression tests, we apply a lubricant between the specimen and the platens to minimise friction, which can cause barrelling and overestimate the compressive strength.
• Digital data acquisition and test automation (with crosshead speed and load control) – Our testing machines are computer‑controlled with real‑time data acquisition, and we generate load‑displacement, stress‑strain, and other derived curves automatically.

Post‑Test Analysis and Failure Mode Classification

After each compression test, we provide a thorough analysis to support your material evaluation:

• Stress‑strain curve plotting – yield, ultimate, and failure points – We generate the full stress‑strain curve and annotate the elastic modulus, yield strength (0.2% offset, if applicable), ultimate compressive strength, and strain at failure. For brittle materials, we report the fracture strain.
• Failure mode classification – crushing, shearing, buckling, or barrelling (ASTM E9, ASTM D695) – We classify the failure mode: for ductile materials, we describe barrelling and the formation of shear bands; for brittle materials, we note the type of fracture (splitting, cone‑type, or crushing).
• Photographic documentation and video recording of the test – We capture images of the specimen before, during (at failure), and after the test, providing visual evidence of the deformation and failure mechanism.
• Data export and custom reporting – in Excel, PDF, or XML formats – We deliver a comprehensive report with all raw data, calculated parameters, and a summary table of results. The report is formatted to align with your internal quality documentation or customer requirements.
• Comparison with specification limits – pass/fail and statistical summary – We compare the test results with your specified minimum or maximum values, provide a pass/fail determination, and include a statistical analysis if multiple specimens are tested (mean, SD, Cp, Cpk).

Report Accreditation and Compliance for Bangladesh

All compression test methods described above are performed within our ISO/IEC 17025:2017 accredited quality management system, ensuring traceable calibration, validated procedures, and competent staff. Our test reports are recognised by the Bangladesh Standards and Testing Institution (BSTI) for product certification and import clearance, and they meet the technical documentation requirements of the Public Works Department and RAJUK for building material approvals, as well as the Bangladesh Garment Manufacturers and Exporters Association (BGMEA) for packaging and container compliance. For export‑oriented manufacturers, our reports align with international standards (ASTM, ISO, BS, EN) required by global buyers. Each report includes a detailed description of the test conditions, specimen dimensions, load‑displacement curves, calculated compressive properties (strength, modulus, yield), failure mode analysis, and a professional conclusion on whether the material or product meets the specified performance criteria – giving you the confidence to approve raw materials, release products, and satisfy regulatory inspections.

Why Choose Our Compression Testing Service

We understand that compressive strength is a critical attribute for many materials and products, and accurate testing is the foundation of safe and reliable design. Our team provides rapid turnaround, flexible test configurations (from single‑specimen to batch testing), and clear, actionable interpretation of results – we don’t just provide numbers; we explain what they mean for your application, material selection, and process control. We work closely with your design, quality, and procurement teams to define the appropriate test parameters, acceptance criteria, and reporting format. With a wide range of testing machines (from 5 kN to 5,000 kN capacity), environmental chambers, and specialised fixtures, our compression testing service delivers the accuracy, repeatability, and regulatory acceptance you need to ensure your materials and components perform reliably under load. Contact us to discuss your materials, test requirements, and performance targets – we will design a tailored test programme that supports your product development and quality assurance goals.