The LC-400 CNC Drop Weight Impact Tester is a high-precision, heavy-duty laboratory testing system engineered strictly in accordance with ISO 3127, GB/T 14152, and ASTM D2444 standards. Designed for plastic pipe manufacturers, third-party quality inspection centers, and material R&D institutes, it evaluates the external impact resistance, toughness, and fracture behavior of thermoplastic pipes (DN20–DN400mm), sheets, and structural components under standardized free-fall mass impacts.
Driven by an automated CNC digital control unit, this state-of-the-art Drop Weight Impact Tester automates height calibration (500–2000mm), automatic zero positioning, hammer lifting, release, and anti-rebound secondary impact capture. Built with a rigid dual-column guidance frame and a 120° V-block specimen support (center alignment error ≤ 2mm), the LC-400 delivers low-friction energy delivery and highly repeatable impact testing for PVC-U drainage, sewage, PE pressure pipes, and low-pressure irrigation systems.
Drop Weight Impact Tester Compliance & Standards ISO 3127 ASTM D2444
This automated impact test apparatus enables certified laboratories to conduct standardized external impact evaluations across global piping frameworks:
| Standard Code |
Standard Title & Scope |
Primary Testing Application |
| ISO 3127 |
Thermoplastics pipes — Determination of resistance to external blows — Round-the-clock method |
International core standard for external drop weight impact resistance testing |
| GB/T 14152 |
Thermoplastics pipes — Determination of resistance to external blows — Round-the-clock method |
Mandatory Chinese national standard for thermoplastic pipe impact behavior profiling |
| ASTM D2444 |
Standard Test Method for Determination of the Impact Resistance of Thermoplastic Pipe and Fittings by Means of a Tup (Falling Weight) |
North American benchmark for falling tup weight impact testing of plastic fittings and pipes |
| GB/T 5836.1 / GB/T 20221 / GB/T 13664 |
Unplasticized poly(vinyl chloride) (PVC-U) drainage, sewage & irrigation pipe specifications |
Quality assurance compliance testing for municipal, agricultural, and civil plastic piping |
Technological Features of LC-400 Drop Weight Impact Tester
- Automated CNC Height Control & Zero CalibrationFeatures a digital CNC control unit that allows precise presetting of drop heights from 500 mm to 2000 mm. Automated zero calibration and motorized hammer positioning reduce manual setup errors and speed up batch testing.
- Anti-Rebound Secondary Impact Prevention MechanismEquipped with a high-speed mechanical anti-rebound catch system that automatically intercepts the rising strike hammer on its initial rebound, guaranteeing that test results reflect only a single, controlled impact event.
- Stable Dual-Column Guidance Frame (Center Deviation ≤ 2 mm)Constructed with a heavy-duty dual-column support structure that minimizes friction losses during free fall. Ensures precise alignment between the impact centerline and the fixture center (deviation ≤ 2 mm).
- Wide Sample Diameter Range (DN20–DN400 mm) & 120° V-Block FixtureAccommodates pipe outer diameters from 20 mm up to 400 mm via a 0–400 mm adjustable workbench travel. Includes three 120° V-shaped support plates for secure, vibration-free positioning.
- Modular Hammer Heads & Counterweight ConfigurationsSupplied with standard D25 and D90 tup hammer heads (optional SR5–SR30 radii available) alongside interchangeable mass counterweights to meet diverse impact energy criteria across different pipe wall thicknesses.
Technical Specifications of CNC Drop Weight Impact Tester
| Product Model |
LC-400 CNC Drop Weight Impact Tester |
| Governing Standards |
ISO 3127, GB/T 14152, ASTM D2444, GB/T 5836.1, GB/T 20221, GB/T 13664 |
| Sample Outer Diameter Range |
20 mm to 400 mm (DN20–DN400) |
| Impact Height Range |
500 mm to 2000 mm (Digital CNC presetting & automatic control) |
| Workbench Travel & Alignment |
Travel: 0 mm to 400 mm; Center Alignment Error ≤ 2 mm |
| Hammer Head Specifications |
D25 and D90 standard hammers (Optional SR5–SR30 heads) |
| Specimen Support Fixture |
Three 120° V-shaped support plates for multi-size pipe alignment |
| Mechanism & Power Supply |
Dual-column structure with anti-rebound catch; AC 220V ±10%, 50Hz (2 kW) |
| Dimensions & Net Weight |
Chamber: 900×550×3550 mm; Cabinet: 550×400×1080 mm; Weight: 400 kg |
System Architecture & Testing Workflow of Drop Weight Impact Tester
Standardized Testing Workflow:
- Condition the plastic pipe specimens at the required test temperature (e.g., 0°C or 23°C) according to ISO 3127 / GB/T 14152.
- Place the pipe specimen onto the 120° V-block support plates and adjust the workbench travel (0–400mm) to align the pipe center.
- Select the target hammer head (D25 or D90) and install counterweights matching the required impact mass.
- Preset the target falling height (500–2000mm) on the CNC digital control cabinet; the system automatically zero-calibrates and raises the hammer.
- Initiate the impact drop; the hammer strikes the pipe surface, and the anti-rebound system instantly catches the hammer on its bounce to prevent secondary impacts. Inspect the sample for cracks or penetration.
Target Customer Applications:
- Rigid PVC (PVC-U) drainage, sewage, and low-pressure agricultural irrigation pipe manufacturers.
- Polyethylene (PE) pressure water line and PP-R hot/cold water pipe production plants.
- Foamed core-layer PVC-U pipe and solid thermoplastic sheet manufacturing facilities.
- Third-party building material testing laboratories and municipal product quality inspection institutes.
Drop Weight Impact Tester FAQ
Q1: How does the secondary impact prevention system work on the LC-400?
A: Following the initial drop impact, the anti-rebound mechanism automatically catches the rising hammer on its rebound path. This prevents a second strike on the specimen, ensuring test results reflect only a single, controlled impact event.
Q2: What types of plastic pipes can be tested with this equipment?
A: The system tests rigid PVC (PVC-U) drainage and sewage pipes, low-pressure irrigation pipes, foamed core-layer PVC-U pipes, PE pipes, and various thermoplastic sheets within a 20mm to 400mm diameter range.
Q3: Why is a 120° V-block fixture used for pipe impact testing?
A: The 120° V-block design provides stable, three-point support across a wide range of pipe outer diameters (DN20 to DN400), ensuring the top impact point stays centered directly below the falling hammer path with less than 2mm deviation.
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