Cometech QC-805P PSTC Tape Initial Adhesion Tester | 21.5° Incline, Φ7/16" & Φ7/32" SUS Balls, PSTC-6
- PSTC-type tape initial adhesion (tack) tester using a fixed 21.5° (21°30') inclined slope to measure the rolling distance of a steel ball on the adhesive tape surface as the tack value.
- Includes Φ7/16" × 3 (SUS) and Φ7/32" × 5 (SUS) stainless steel balls; slope length 6.5 inches; result is the average of five test runs.
- Simple lightweight benchtop instrument — 461 g, no power required, compact 6.5 × 6.5 × 21 cm footprint.
- Test procedure: clean runway and ball with solvent, stick 1" wide × 15" long tape specimen, release ball from the release bar, measure roll-stop distance; repeat 5 times for average value.
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Overview
Cometech QC-805P is the PSTC-method version of the tape initial adhesion (ball tack) tester.
Unlike the QC-805 / QC-805A which use ball number (size) as the tack index, the QC-805P measures how far a defined steel ball rolls along the adhesive surface before stopping — a longer rolling distance means lower tack, and a shorter distance indicates higher initial adhesion.
The incline is fixed at 21.5° (21°30') per PSTC-6 requirements, and the result is the average of five consecutive test runs.
This is a compact, passive instrument with no power required, designed for benchtop use.
Test Procedure
- Clean the runway and steel ball surface using solvent.
- Stick a 1-inch wide × 15-inch long tape specimen adhesive-side up at the front of the runway.
- Place the steel ball above the release bar using a clean, dry clip.
- Release the ball to roll freely down the slope and onto the tape specimen.
- Measure the distance the ball travels on the tape before stopping.
- Repeat 5 times and calculate the average value.
Standards
- PSTC-6
Full Specifications
| Model | QC-805P |
|---|---|
| Slope angle | 21.5° (21°30') |
| Ball diameter | Φ7/16 inch × 3 pcs (SUS stainless steel) Φ7/32 inch × 5 pcs (SUS stainless steel) |
| Slope length | 6.5 inch |
| Dimension | 6.5 × 6.5 × 21 cm |
| Weight | 461 g |
| Power | Not required |
Support materials
- Test video, teaching material, SOP, and test case (availability depends on configuration and region).
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YOAST_FOCUS_KEYPHRASE: QC-805P PSTC tape initial adhesion tester
YOAST_SEO_TITLE: Cometech QC-805P PSTC Tape Initial Adhesion Tester | 21.5° Incline | PSTC-6 | PTS Lab UAE
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META_DESCRIPTION: Cometech QC-805P PSTC tape initial adhesion tester per PSTC-6. Fixed 21.5° (21°30') incline, Φ7/16" (×3) and Φ7/32" (×5) SUS stainless steel balls, 6.5-inch slope length. Test result = average rolling distance of 5 runs on 1"×15" tape specimen. Compact benchtop unit: 6.5×6.5×21 cm, 461 g, no power required.