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ASTM D5895 DIN EN ISO 9117

Professional Drying Time Recorder QPI‑DTR6800 - Application:

The Professional Drying Time Recorder QPI‑DTR6800 is designed to perform standardized drying‑time evaluations of organic coatings according to ASTM D5895 and ISO 9117‑4. These internationally recognized methods define how to measure the transition of a coating film from liquid to fully cured using a mechanical linear recorder. The QPI‑DTR6800 provides controlled traverse speed, stable load application, and multi‑track capability, enabling precise, repeatable drying‑stage determination for R&D laboratories, paint manufacturers, and industrial QC environments.

1. ASTM D5895 Test Method — Drying & Curing During Film Formation

ASTM D5895 describes how to evaluate the distinct drying and curing stages of organic coatings using straight‑line mechanical recorders. The QPI‑DTR6800 follows this method by moving a hemispherical stylus across a freshly applied coating film under controlled conditions.

ASTM‑Defined Drying Stages

ASTM D5895 identifies four critical film‑formation stages:

• Set‑to‑Touch Time The coating stops flowing and begins resisting deformation. The stylus leaves a pear‑shaped indentation indicating early solidification.

• Tack‑Free Time The film supports the stylus without sticking or tearing. The track becomes narrower and more uniform.

• Dry‑Hard Time The stylus no longer cuts or tears the film, leaving only superficial marks. This indicates sufficient curing for handling or packaging.

• Dry‑Through Time The stylus leaves no visible track, showing complete solidification and full film integrity.

ASTM Mechanical Recording Principle

The QPI‑DTR6800 replicates the ASTM mechanical recording process:

• A hemispherical stylus (1 mm or 2 mm tip) travels across the coating at a fixed speed.

• The stylus load is standardized (typically 5 g).

• The recorder documents the film’s resistance to deformation over time.

• Engineers interpret the stylus trace to determine each drying stage.

Why ASTM D5895 Matters

ASTM D5895 is essential for:

• Comparing coating formulations

• Evaluating solvent‑borne, waterborne, and high‑solids systems

• Documenting drying behavior under controlled environmental conditions

• Identifying curing performance beyond the standard 8‑hour workday

The QPI‑DTR6800’s multi‑track system allows simultaneous testing of multiple samples, improving throughput and formulation comparison accuracy.

2. ISO 9117‑4 Test Method — Determination of Drying Behaviour Using a Mechanical Recorder

ISO 9117‑4 is the international counterpart to ASTM D5895 and defines how to measure drying behavior using a linear mechanical recorder. The QPI‑DTR6800 meets ISO requirements for traverse speed, stylus geometry, substrate dimensions, and environmental control.

ISO Drying‑Time Evaluation

ISO 9117‑4 focuses on:

• Film formation under standardized environmental conditions

• Stylus trace interpretation to determine set‑to‑touch, dry‑hard, and dry‑through times

• Reproducible mechanical recording for global comparison of coating systems

ISO emphasizes the importance of:

• Controlled substrate preparation

• Uniform film thickness

• Stable temperature and humidity

• Repeatable stylus movement and load application

The QPI‑DTR6800’s precision drive system and stable load mechanism ensure compliance with these requirements.

3. Using the QPI‑DTR6800 for ASTM & ISO Drying‑Time Testing

Step‑by‑Step Technical Workflow

1. Prepare the substrate Apply a uniform coating film using a standardized applicator (per ASTM D823).

2. Mount the glass strip Place the coated strip into one of the recorder’s tracks.

3. Select test duration Choose 6 h, 12 h, 24 h, or custom timing depending on coating type.

4. Set stylus load & tip size Use the hemispherical stylus specified by ASTM/ISO.

5. Start the recording cycle The stylus travels across the coating at a constant speed.

6. Analyze the trace Identify transitions in the stylus track corresponding to ASTM/ISO drying stages.

7. Document results Record drying times for QC, formulation optimization, or certification.

Engineering Advantages of the QPI‑DTR6800

• Multi‑track simultaneous testing

• Stable traverse speed for reproducible results

• Precision stylus load control

• High‑resolution timing accuracy

• Ideal for waterborne, solvent‑borne, alkyd, acrylic, and 2K coatings

• Fully compliant with ASTM D5895 and ISO 9117‑4