Tuofeng TFW-308 Microcomputer-Controlled Electronic Universal Testing Machine for Construction Sealant Tensile Testing
| Brand | Tuofeng |
|---|---|
| Origin | Shanghai, China |
| Manufacturer Type | Direct Manufacturer |
| Model | TFW-308 |
| Load Capacity | 300 kN |
| Load Accuracy | ±0.5% |
| Test Standard Compliance | GB/T 16491-2008, JJG 475-2008, ASTM E4, ISO 7500-1, DIN 51221, JIS B 7721 |
| Accuracy Class | 0.5 |
| Effective Force Range | 0.2–100% of Full Scale |
| Force Resolution | 1/500,000 full-scale code (fixed resolution, no range switching) |
| Drive System | Imported Servo Motor + Precision Worm Gear Reducer |
| Lead Screw | High-Accuracy Ball Screw |
| Effective Test Width | 600 mm (customizable) |
| Max Stroke | 800 mm (extendable) |
| Speed Range | 0.001–500 mm/min (infinitely variable) |
| Displacement Measurement | Optical Encoder (Accuracy: ±0.005% of reading) |
| Strain Measurement | Optional Extensometer or Large-Deformation Sensor (Accuracy: ±0.005% of reading) |
| Safety Protection | Electronic Limit Switches, Emergency Stop, Overload Cut-off (>110% FS), Dual-Speed Motorized Crosshead Control |
| Software | Windows-Based, Multi-Language (EN/CN-Traditional/CN-Simplified), Real-Time Curve Overlay (Force-Time, Force-Displacement, Stress-Strain, etc.), Auto-Calculation of Tensile Strength, Elongation at Break, Yield Strength, Modulus of Elasticity, Peel Adhesion, Shear Strength, Tear Strength, Bond Strength, and Custom Parameter Derivation |
| Data Management | Automatic Save, Batch Reporting, GLP-Compliant Audit Trail (Optional), Export to CSV/PDF/Excel |
Overview
The Tuofeng TFW-308 is a high-precision, microcomputer-controlled electronic universal testing machine engineered specifically for mechanical property characterization of construction sealants, adhesives, elastomeric joint fillers, and related polymeric building materials. It operates on the principle of controlled uniaxial force application—using a servo-driven ball-screw actuation system—to measure tensile, compressive, flexural, peel, shear, and tear responses under standardized loading conditions. Designed in strict accordance with GB/T 16491–2008 (equivalent to ISO 7500-1 Class 0.5) and calibrated per JJG 475–2008, the TFW-308 delivers traceable force measurement accuracy of ±0.5% across its full 300 kN capacity range, with a force resolution of 1 part in 500,000 full scale—ensuring reproducible results for low-force sealant elongation tests and high-load structural joint evaluations alike.
Key Features
- Class 0.5 accuracy certified per GB/T 16491–2008 and ISO 7500-1, validated by national metrological institute protocols
- High-resolution force sensing with fixed 500,000-count A/D conversion—no auto-ranging artifacts across 0.2–100% FS
- Precision ball screw transmission coupled with imported servo motor and worm gear reducer for smooth, backlash-free motion control
- Dual-speed crosshead drive (fast approach/slow test) with programmable return-to-start functionality post-test
- Integrated safety architecture: electronic limit switches, hardware emergency stop, real-time overload cutoff (>110% FS), and software-enforced operational boundaries
- Modular extensometry support—including clip-on axial extensometers and non-contact video-based large-deformation tracking—for strain-critical sealant testing (e.g., ASTM C719, ISO 8339)
- Thermally stable load frame design (steel-reinforced welded base, rigid column assembly) minimizing thermal drift during long-duration creep or relaxation tests
Sample Compatibility & Compliance
The TFW-308 accommodates standard and custom-configured fixtures for ASTM C719 (adhesion and cohesion testing of sealants), ASTM C1135 (tensile properties of structural silicone sealants), ISO 8339 (elastomeric joint sealants), EN 15659 (fire-resistance tested sealants), and GB/T 13477 (Chinese standard for building sealants). Its 600 mm effective test width and 800 mm vertical stroke support multi-specimen mounting, including dog-bone, dumbbell, lap-shear, and peel configurations. All mechanical and software functions comply with regulatory requirements for quality assurance environments: audit trail logging (optional 21 CFR Part 11 compliance module), calibration certificate traceability to NIM (National Institute of Metrology, China), and full alignment with GLP/GMP documentation workflows used in third-party certification labs and construction material R&D centers.
Software & Data Management
Tuofeng’s proprietary TESTMaster v5.2 software provides deterministic, deterministic real-time control and analysis under Windows OS. It supports seven preconfigured test modes—tensile, compression, bend, peel, shear, tear, and hold—and enables user-defined control sequences (e.g., cyclic loading, stress relaxation, creep ramp-hold). The interface displays synchronized dual-axis curves (force vs. displacement, stress vs. strain, load vs. time), with overlay capability for up to 16 comparative specimens. Calculated outputs include tensile strength (MPa), elongation at break (%), modulus at 100%/200%/300% strain, peel adhesion (N/mm), cohesive failure percentage, and bond durability metrics. Raw data exports are CSV-compatible; reports conform to ASTM E1391 and ISO/IEC 17025 documentation standards. Software updates are provided free of charge for the instrument’s service life, with version-controlled release notes and validation documentation available upon request.
Applications
This system serves as a primary mechanical validation platform for sealant formulation development, QC release testing, and performance qualification against international building codes. Typical use cases include: evaluating UV/weathering-induced embrittlement in silicone and polyurethane sealants; quantifying cold-temperature flexibility loss per ASTM C1135 Annex A; verifying firestop system integrity under thermal-mechanical load per UL 1479; assessing long-term creep compliance of polysulfide joint sealants in façade applications; validating adhesion retention after immersion per ASTM C794; and supporting CE marking submissions for construction products under EU CPR Regulation (Regulation (EU) No 305/2011). It is routinely deployed in accredited laboratories serving architectural glazing contractors, sealant manufacturers, and national building research institutes.
FAQ
Does the TFW-308 meet ASTM and ISO calibration requirements for accredited testing labs?
Yes—the system is supplied with factory calibration certificates traceable to NIM, and its force and displacement measurement uncertainty complies with ISO/IEC 17025 Annex A. Optional on-site verification and ISO 17025-compliant calibration services are available.
Can the machine perform cyclic fatigue testing on sealant joints?
Yes—TESTMaster v5.2 supports programmable sinusoidal, triangular, and trapezoidal waveforms with closed-loop strain or load control, enabling ASTM D882-compliant fatigue protocols for elastomeric sealants.
Is GLP-compliant audit trail functionality included by default?
Audit trail logging (user actions, parameter changes, test start/stop timestamps) is embedded in the base software. 21 CFR Part 11 electronic signature and role-based access control modules are available as validated add-ons.
What extensometer options are supported for low-strain modulus measurements?
The system accepts ASTM E83-compliant Class B-1 axial extensometers (e.g., 25 mm gauge length, ±0.5 µm resolution) and non-contact digital image correlation (DIC) systems for surface strain mapping—both fully integrated into TESTMaster data acquisition.
How is thermal drift mitigated during extended-duration tests?
The load frame uses low-coefficient-of-thermal-expansion steel alloys; all electronics feature active temperature compensation; and the software applies real-time zero-drift correction algorithms verified per ISO 204.
