ASTM F88 / F2029 Compliant
Heat Seal Tester
Laboratory Packaging Integrity Testing Equipment
KHT Instrument designs and manufactures professional heat seal testers for pharmaceutical, food, film, and battery packaging labs. Three models — from manual entry-level to IoT-ready touchscreen — covering 0–300°C, 0–600N, ±0.5°C accuracy.
5-Position Gradient
Test 5 temperature zones simultaneously — map your full seal window in one run
±0.5°C Accuracy
Precision temperature control with digital readout across all STH models
ASTM F88/F2029
Factory-compliant testing procedures for pharmaceutical, food, and film labs
Factory Direct Price
Direct from Shandong, China — 30–60% cost advantage vs. Western brands
STH Series
Three Models for Every Heat Seal Testing Need
From a manual benchtop unit for small labs to an IoT-ready touchscreen model for production environments — select the STH model that matches your standard, throughput, and budget.
STH-3
Manual Entry-Level
Reliable manual heat seal tester for R&D startups and small packaging labs. Simple dial-controlled operation with full ASTM F88/F2029 compliance.
Temp Range
0–300°C
Force
0–600N
Accuracy
±0.5°C
Positions
1 (single-point)
STH-3A
5-Position Gradient
Our flagship digital gradient heat seal tester. Test 5 temperature points simultaneously — map your full seal window in one session and save hours per test cycle.
Temp Range
0–300°C
Gradient
5-position
Display
Digital LED
Standards
ASTM F88/F2029
STH-5
Touchscreen IoT
Touchscreen IoT-ready heat seal tester with programmable profiles, data export, and remote monitoring. Designed for high-throughput pharmaceutical and battery labs.
Interface
7" Touchscreen
Data
USB/LAN export
Profiles
Programmable
Standards
F88/F2029/ISO 11607
Applications
Heat Seal Testing Across Every Packaging Industry
One platform, four critical industries. KHT STH heat seal testers are validated for pharmaceutical sterile barriers, food flexible packaging, film R&D, and lithium battery pouch cells.
Pharmaceutical
Blister packs, sterile pouches, and lidstock for ISO 11607/USP <1207> compliance. Prevent microleaks that compromise patient safety.
Food Packaging
Lidstock SIT testing, snack bags, and flexible pouches per ASTM F88. Reduce recall risk by verifying seal integrity before production runs.
Flexible Film R&D
Map heat seal windows for PE, PP, EVOH, and BOPP multilayer films with the STH-3A 5-position gradient. Full seal curve in one ASTM F2029 test session.
Battery Pouch
Aluminum laminate film at 200°C, 22.5N/15mm specification. Gradient testing for top and side seals on lithium-ion pouch cells. GB/T and IEC 62133 aligned.
Model Comparison
STH-3 vs STH-3A vs STH-5: Choose Your Model
All three models comply with ASTM F88 and F2029. The right choice depends on your testing volume, required data output, and IoT integration needs.
| Feature | STH-3 (Manual) | STH-3A (Gradient) | STH-5 (Touchscreen) |
|---|---|---|---|
| Temperature Range | 0–300°C | 0–300°C | 0–300°C |
| Temp Accuracy | ±0.5°C | ±0.5°C | ±0.5°C |
| Sealing Force | 0–600N | 0–600N | 0–600N |
| Test Positions | 1 | 5 (gradient) | 1 (programmable) |
| Control Type | Manual dial | Digital LED | 7" Touchscreen |
| Data Logging | Manual record | Manual record | Auto USB/LAN |
| IoT / Remote | No | No | Yes |
| Best For | Small R&D labs | Film R&D / QC | Production pharma/battery |
| ASTM F88 | ✓ | ✓ | ✓ |
| ASTM F2029 | ✓ | ✓ | ✓ |
| ISO 11607 | — | Compatible | ✓ |
Trust KHT
Why Labs Choose KHT Instrument
25+
Years Manufacturing
500+
Labs Worldwide
±0.5°C
Temperature Accuracy
5
Gradient Positions
Compliance
ASTM and ISO Standards Built Into Every Test
KHT STH testers ship ready for the standards your QA team depends on. No retrofitting required.
The core standard for flexible packaging heat seal peel strength measurement.
Standardized sealing procedure for reproducible inter-lab results.
Leak detection for sterile seal integrity (used with F88).
Medical device packaging sterile barrier system requirements.
US Pharmacopeia container closure integrity for pharmaceutical packaging.
Frequently Asked Questions
Technical Guides
Heat Seal Testing Resources
Practical guides, ASTM/ISO standard explainers, and application case studies for packaging lab professionals.
Heat Seal Tester Buying Guide 2026
Compare manual, digital gradient, and touchscreen models. Key specs, ASTM F88 compliance checklist, and price ranges explained.
Read more TechnicalWhy 5-Position Gradient Testing Finds Your Seal Window Faster
How gradient heat seal testing generates a full temperature-seal curve in one run, saving hours vs. single-point methods.
Read more StandardsASTM F88 Complete Guide for Flexible Packaging Labs
Method overview, specimen preparation, peel angle selection, failure modes, and acceptance criteria for packaging labs.
Read more StandardsHot Tack vs Heat Seal: Which Test Do You Need?
Definitions, ASTM F1921 vs F88 standards, key applications, and how to choose the right test for your packaging process.
Read moreReady to Find the Right Heat Seal Tester?
Factory-direct pricing, ASTM F88/F2029 calibration documentation, and multilingual technical support. Response within 24 hours.
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