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Densicom Tester

Densicom Tester
Product Categories
Rubber & Elastomer Testing Equipment
Plastic Testing Equipment
Standards
ASTM D1622
ASTM D297
ASTM D792
EN ISO 20345
EN ISO 20347
ISO 1183-1
ISO 2781
ISO 845
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Densicom Tester — QT-7190

Automatic Specific Gravity & Density Tester for Footwear Sole Materials | Archimedes Buoyancy Principle

The QT-7190 is a precision automatic Densicom Tester designed for measuring the specific gravity and density of footwear outsole and midsole materials. As a purpose-built digital gravitometer, the QT-7190 Densicom Tester supports the complete range of sole materials encountered in modern footwear manufacturing — including rubber, plastics, polyurethane (PU), ethylene-vinyl acetate (EVA) foam, thermoplastic rubber (TPR), thermoplastic polyurethane (TPU), and PVC — making it an essential quality control and R&D instrument for shoe manufacturers, sole component suppliers, and material testing laboratories across the United States and Canada.

The QT-7190 Densicom Tester operates on the Archimedes buoyancy principle, automatically measuring the sample's weight in air and its apparent weight when submerged in water via an auto-lifting water tank mechanism. The instrument's high-sensitivity load assembly and digital controller eliminate manual water immersion steps, significantly reducing operator involvement and the risk of measurement error. Specific gravity is calculated and displayed automatically by the onboard digital controller immediately after the test cycle completes.

Equipped with a high-precision sensor, a digital display controller for result browsing and data storage, and a compact printer for on-demand result output, the QT-7190 Densicom Tester delivers a fully self-contained specific gravity testing solution. Its flexible design — with interchangeable insert and clip grips to accommodate specimens of different forms and sizes — makes the QT-7190 equally suitable for finished outsoles, cut specimens from semi-finished components, and irregularly shaped sole samples that cannot be easily prepared into standard test specimens. At a 1 kgf capacity with ±1% load accuracy, the QT-7190 is engineered for the production-line throughput and measurement precision demands of competitive footwear manufacturing environments.

Densicom Tester — QT-7190 Application

Densicom Tester — QT-7190Densicom Tester — QT-7190

The QT-7190 Densicom Tester is used across a wide range of footwear and materials testing applications:

  • Specific gravity and density measurement of rubber, EVA, PU, TPR, TPU, and PVC outsole and midsole materials in production QC workflows
  • Incoming material inspection at footwear manufacturers and sole component suppliers — verifying that received materials meet specified density targets before production entry
  • Finished outsole and midsole density verification as part of outgoing product quality assurance programs
  • Material development and formulation R&D — monitoring how changes in compound formulation affect density and specific gravity
  • Density uniformity testing across batches of sole blanks or finished soles to detect compounding inconsistencies or process variation
  • Comparison testing of competing sole materials or alternative compounds during supplier qualification programs
  • Testing of irregularly shaped specimens and finished sole units that cannot be conventionally cut or prepared for gravimetric measurement — using the dedicated supporting bracket for high-buoyancy samples
  • Compliance testing against footwear industry material specifications requiring documented specific gravity values per ASTM D792, ISO 2781, ISO 1183, or SATRA TM-related density requirements

Applicable Standards & Regulatory Compliance

The QT-7190 Densicom Tester is designed for use in specific gravity and density testing in accordance with the following internationally recognized test standards.

  • ASTM D792 — Standard Test Methods for Density and Specific Gravity (Relative Density) of Plastics by Displacement: the primary U.S. standard for hydrostatic weighing-based specific gravity measurement of plastic and rubber materials, directly applicable to EVA, TPU, TPR, and PVC sole materials
  • ASTM D297 — Standard Test Methods for Rubber Products — Chemical Analysis: includes a hydrostatic density test method used interchangeably with ASTM D792 for rubber compounds; applicable to rubber outsole materials
  • ISO 2781 — Rubber, vulcanized or thermoplastic — Determination of density: international standard specifying the hydrostatic weighing method for density measurement of vulcanized and thermoplastic rubber, directly applicable to rubber sole compounds
  • ISO 1183-1 — Plastics — Methods for determining the density of non-cellular plastics — Part 1: Immersion method, liquid pyknometer method and titration method: the ISO equivalent of ASTM D792 for plastic sole materials including TPR, TPU, and PVC
  • ISO 845 — Cellular plastics and rubbers — Determination of apparent (bulk) density: applicable when testing EVA foam and other cellular midsole materials using the buoyancy displacement method
  • ASTM D1622 — Standard Test Method for Apparent Density of Rigid Cellular Plastics: applicable for rigid foam midsole and insole component density measurement
  • EN ISO 20347 / EN ISO 20345 — Personal protective equipment — Occupational and safety footwear: references density requirements for outsole compounds in protective footwear certification, for which the QT-7190 provides the density measurement data

Densicom Tester — QT-7190 Key Features

Automatic Measurement Cycle

  • Fully automated test sequence: the QT-7190 Densicom Tester automatically measures specimen weight in air, lifts the water tank to submerge the specimen, records the apparent weight in water, and calculates specific gravity — all without operator intervention between steps
  • Automatic specific gravity calculation: eliminates manual formula computation and the associated risk of calculation error
  • Efficient testing workflow: rapid automated cycle is particularly advantageous for batch testing scenarios involving multiple specimens

Auto-Lifting Water Tank

  • Motorized auto-lifting water tank: automatically raises and lowers to submerge the specimen at the correct point in the test cycle — removing the manual step of lowering the specimen into water and eliminating measurement variability from operator technique
  • Adjustable immersion depth: the depth of immersion of the specimen in the liquid can be set as needed to accommodate specimens of different sizes and forms
  • Water tank dimensions (L × W × H): 490 × 145 × 225 mm — generous capacity for full outsole specimens

High-Precision Sensing & Load System

  • High-precision sensor (high-sensitivity assembly): delivers accurate force measurements for both in-air weighing and buoyancy force measurement, ensuring reliable specific gravity results across the full 1 kgf measurement range
  • Load capacity: 1 kgf; Load accuracy: ±1%
  • Stroke: 250 mm — accommodates specimens of varying dimensions within the measurement range

Grip & Fixture Options

  • Insert grip: supplied for standard cut sole specimens — positive engagement with minimum specimen distortion
  • Clip grip: supplied for thinner, irregular, or unconventional specimen forms — broadens the range of specimen types the QT-7190 Densicom Tester can accommodate without custom fixturing
  • Supporting bracket available for whole outsole specimens with high buoyancy (e.g., EVA foam soles) that would otherwise float above the water surface

Digital Controller & Data Management

  • Digital display controller: provides a clear, intuitive interface for test parameter entry, result display, and stored data browsing — accessible to all operator skill levels
  • Onboard data storage: saves test results for subsequent review, trend analysis, and QC documentation without requiring a separate PC
  • Built-in compact printer: prints results on demand for physical QC records, batch certificates, and shipping documentation

Construction & Installation

  • Overall dimensions (W × D × H): 580 × 400 × 890 mm — standard laboratory footprint compatible with a QC bench or dedicated testing station
  • Net weight: approximately 90 kg — stable, vibration-resistant platform for precision specific gravity measurement

Theory and Method

The QT-7190 Densicom Tester applies the Archimedes buoyancy principle to determine the specific gravity of solid and cellular sole materials. Archimedes' principle states that a body immersed in a fluid experiences an upward buoyant force equal to the weight of the fluid it displaces. By measuring the difference between a specimen's weight in air and its apparent weight when fully submerged in water, the instrument calculates the volume of the specimen and — combined with its air weight — determines specific gravity and density.

The test procedure on the QT-7190 begins by securing the specimen in the appropriate grip fixture — either the insert grip for standard cut specimens or the clip grip for thinner or irregular samples. The high-precision sensor records the specimen's weight in air as the first measurement step. The auto-lifting water tank then raises automatically, fully submerging the suspended specimen in water. The sensor simultaneously records the specimen's apparent weight in water as the buoyant force measurement. No manual water immersion or weight manipulation is required by the operator at any stage.

The digital controller calculates specific gravity using the standard Archimedes formula: specific gravity = (weight in air) / (weight in air − apparent weight in water). For specimens with a specific gravity less than 1.0 — such as EVA foam midsoles — a sinker weight or dedicated high-buoyancy supporting bracket is used to maintain the specimen below the water surface throughout the submerged weighing cycle. The depth of immersion is fully adjustable to accommodate specimens of different thicknesses and forms.

The calculated specific gravity value is immediately displayed on the digital controller's screen, automatically saved to onboard memory, and can be printed on demand via the built-in compact printer. The instrument's high-sensitivity load cell assembly ensures that even small density differences between specimens — critical for detecting compounding inconsistencies in production batches — are captured within the ±1% load accuracy specification.

Densicom Tester — QT-7190 Technical Specifications

ParameterSpecification
ModelQT-7190 (Densicom Tester)
Measurement PrincipleArchimedes buoyancy / hydrostatic weighing
Test MaterialsRubber, plastics, PU, EVA foam, TPR, TPU, PVC — outsole and midsole materials
Load Capacity1 kgf
Load Accuracy± 1%
Stroke250 mm
Water Tank Dimensions (L × W × H)490 × 145 × 225 mm
Water Tank OperationAuto-lifting motorized mechanism
Grips / Fixtures SuppliedInsert grip × 1; Clip grip × 1
Sensor TypeHigh-precision, high-sensitivity load cell
Specific Gravity CalculationAutomatic — digital controller
DisplayDigital display controller with result browsing and data storage
PrintingBuilt-in compact printer
Overall Dimensions (W × D × H)580 × 400 × 890 mm
Net Weight (approx.)90 kg

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