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LBTZ-51 Waterproof Membrane Lap Joint Impermeability Tester

Name: LBTZ-51 Waterproof Membrane Lap Joint Impermeability Tester
Brand: Laibote (Tianjin) Testing Machinery
Availability: InStock

Category:

Rubber and Waterproofing Material Testing Equipment

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E-mail:

lbt@lbt.ltd

WhatsApp:

+86-15102211717

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LBTZ-51 Waterproof Membrane Lap Joint Impermeability Tester

Description

Product Introduction

The waterproof membrane lap‑joint impermeability tester complies with the national standards GB 55030‑2022 and GB 45320‑2025, which set mandatory requirements for waterproofing in building and municipal engineering. Additionally, the national standard “Safety and General Technical Specifications for Building Waterproof Membranes” has introduced a new requirement for the “impermeability of lap joints” of waterproof membranes. This requirement covers all lap‑joining methods, including heat‑fusion, welding, self‑adhesive, adhesive bonding, and tape‑sealing. Upon formal implementation of these standards, “lap‑joint impermeability” will become a mandatory criterion in the quality acceptance of waterproof membranes. In accordance with the test methods specified in T/CWA 302‑2023/10, construction practices for building waterproofing projects constitute an essential component of construction technology, ensuring that buildings and structures are protected from water ingress and that interior spaces remain unaffected. Through the proper application of waterproofing materials, the occurrence of water infiltration and leakage can be prevented, thereby safeguarding the functional performance of buildings and extending their service life.

Technical Specifications:

Parameter Category	Parameter content
Power supply	220V 50Hz
Pressure range	0–0.4 MPa
Pressure sensor accuracy	Level 1
Number of permeable discs	Three stations
Inner diameter of the permeable disc	250mm
Specimen dimensions	300*300mm

Instructions for Use

When using cement-based adhesives for lap‑joint specimens, the lap joints at the sealing ring should be filled with materials such as butyl tape or two‑component polyurethane waterproof coating to prevent the adhesive from being crushed under load during testing, which could lead to water penetration. After lapping, the specimen dimensions are approximately 300 mm × 300 mm. A seal is applied around the rubber gasket by means of tape, sealant, or by adhering a membrane of appropriate thickness and size, thereby eliminating any height difference that may arise on the water‑facing side after the membrane is lapped. On the non‑water‑facing side, a suitably sized membrane can be placed directly to bridge the height difference. For self‑adhesive membranes, the release liner on the water‑facing surface of the specimen must be removed, and the portion of the self‑adhesive layer in contact with the test apparatus should be covered with a paper towel. A schematic diagram of the lap joint is shown in the figure.

Procedure:

(1) Before use, first adjust the pressure according to the test conditions specified for the specimen. To do so, set the pressure to 0.2 MPa and the hysteresis to 0.1 MPa.

(2) During operation, loosen and remove the retaining rings from the three permeable plates, tightly close the drain valve, slowly fill the water inlet box with clean water from the side, connect the power supply and turn it on, then press the test button to activate the pressure pump for water injection. Once water begins to emerge from the central inlet hole of the permeable plate, press the stop button to halt the filling process. Place the specimen to be tested on the rubber gasket of the permeable plate, then position the joint‑waterproof cover plate over the specimen, securely clamp the specimen, set the desired pressure and duration, and finally press the test button to start the test.

Instructions for use:

1. Before use, set the pressure according to the test requirements of the specimen.

The method for adjustment is:

(1) Click to set the pressure value; an input keypad will appear, allowing you to enter the test pressure.

2. When using the electric waterproof membrane lap‑joint water‑tightness tester, close the drain valve tightly, slowly fill the side‑mounted water reservoir with clean water, and open each permeation‑plate valve one by one. Press the test button to activate the pressure pump and inject water until water begins to emerge from the central inlet of the permeation plate; then press the stop button to halt the injection. Proceed from right to left in sequence: 0 (0 represents the drain valve, which may only be opened after the test is completed), 1, 2, and 3—continue filling until water overflows from the central inlet of the permeation plate and completely fills the plate.

3. Place the test specimen on the annular rubber ring of the permeable plate, then position the specimen press plate on top of the specimen and secure it firmly.

4. Set the time value according to the test requirements. Click on the time value:

5. Click the test; the pressure pump begins to pressurize the container, and the pressure‑increase indicator light illuminates.

6. When the pressure reaches the upper limit, pressurization automatically stops; at this point, the pressurization indicator light turns off. After completing the test for the prescribed duration, open the drain valve to release the water and relieve the pressure, then loosen the pressure ring and remove the specimen. The test is now complete.

7. Set parameters:

Press the Settings button to enter the settings interface:

8. System Calibration:

According to the calibration procedure, enter the password 8888 to access the calibration interface. With no pressure applied, press “Zero” to reset the zero point; then apply a known force to the sensor and press “Pressure Calibration.” Enter the applied force value, and the displayed pressure will match the applied force—calibration is complete. The device is pre‑calibrated at the factory and ready for immediate use.

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FAQs

Do you supply full-set testing instruments for asphalt and geotechnical engineering projects?

We offer complete lab solutions including asphalt viscosity tester, asphalt rutting tester, geotextile permeability tester, low-temperature flexibility tester and concrete/cement test equipment, covering raw material detection for road, water conservancy and construction engineering projects

Can you customize fixtures or test machines based on our special test requirements? How about after-sales service and warranty?

We provide non-standard customization of test equipment and customized fixture clamps according to customers’ specimen size and test standards. All our testing machines enjoy 12-month factory warranty; overseas customers get remote online debugging guidance, spare parts supply and technical operation training. Our products have been exported to over 70 countries globally

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It measures heat deflection temperature and Vicat softening temperature of plastics, hard rubber, nylon, insulating materials and fiber-reinforced thermosetting composites. Intelligent temperature control guarantees precise heating rate, ideal for plastic raw material incoming inspection and formula development in plastic factories.

Does your pipe pressure burst testing machine control test temperature automatically? What’s its main application?

Yes, the constant-temperature circulating system keeps stable test environment during long-time hydrostatic resistance and instant burst pressure measurement of thermoplastic pipes. It complies with GB6111 standard and serves raw material inspection, new product R&D for plastic pipe manufacturers, third-party testing labs and university laboratories.

What kinds of pipes fit your ring stiffness tester? Can it do long-term creep testing?

This equipment is designed for HDPE, PVC corrugated pipes, plastic drainage pipes and various plastic tubular products. Apart from ring stiffness, ring flexibility and flattening tests, it supports continuous long-term creep tests up to 1000 hours (42 days) as required by industry specifications, widely used for pipe factories and construction quality inspection institutes.

What test items can your WDW series computer-controlled electronic universal testing machine complete? Which international standards can it meet?

Our WDW universal tester is applicable for tension, compression, bending, shearing and peeling tests of metal, plastic, rubber and composite materials. It supports test procedures in accordance with GB, ISO, ASTM, DIN, JIS multiple domestic and global standards. Equipped with high-precision servo drive and dedicated test software, it automatically collects, calculates and exports test data including tensile strength, elongation at break and elastic modulus.

Customer Reviews

Southeast Asia Rubber & Polymer Factory｜Purchase: Vicat Softening Point & Tensile Testing Machine

From Tanaka Hiroshi, R&D Supervisor, Indonesia rubber materials enterprise

2026.06.05

★★★★★

“Laibote’s Vicat softening point tester and electronic tensile machine have been applied to our raw material incoming inspection and new formula development for over one year. High testing accuracy effectively controls our product defect rate. What impresses us most is their responsive after-sale service; technical staff reply our troubleshooting requests within 24 hours even for time zone differences. Compared with expensive European brands, Laibote’s equipment balances quality and price excellently, we plan to expand procurement of auxiliary testing instruments next quarter.”

Middle East Construction Lab｜Purchase: Universal Electronic Testing Machine & Geotextile Test Equipment

From Mohamed Kareem, Lab Manager, UAE third-party construction inspection institute

2026.06.05

★★★★★

“We compared multiple testing equipment brands from Europe and China before cooperating with Laibote. Their WDW universal tester and full-set geotextile testing instruments meet local construction testing standards perfectly. Custom fixtures tailored per our specimen specifications save much testing time. Pre-sale technical communication was patient and professional; engineers provided online operation training after goods arrived. Stable machine performance greatly improves our laboratory’s detection efficiency, we are satisfied with cost performance and overall service.”

European Plastic Pipe Manufacturer｜Purchase: Ring Stiffness & Hydrostatic Burst Tester

From Thomas Bennett, Quality Director, UK plastic pipe factory

2026.06.05

★★★★★

“We have purchased two sets of pipe testing equipment from Laibote (Tianjin) for 18 months. The ring stiffness and hydrostatic burst testing machines run stably for daily batch inspection, test data matches ISO standard requirements precisely, and the intelligent test software is easy for our operators to master. Their after-sales team offers timely remote technical guidance whenever we have operational problems, spare parts supply is efficient. We have arranged a second bulk order for our new production workshop and will recommend Laibote’s testing machines to our industry partners across Europe.”

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