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LBTZ-18 Low-Temperature Tensile Recovery Elasticity Testing Machine for Vulcanized Rubber (TR Test)

Name: LBTZ-18 Low-Temperature Tensile Recovery Elasticity Testing Machine for Vulcanized Rubber (TR Test)
Brand: Laibote (Tianjin) Testing Machinery
Availability: InStock

The specimen is stretched at room temperature, then cooled to a sufficiently low temperature at which no relaxation occurs upon removal of the tensile load. The tensile load is removed, and the temperature is raised at a uniform rate.

Category:

Rubber and Waterproofing Material Testing Equipment

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E-mail:

lbt@lbt.ltd

WhatsApp:

+86-15102211717

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LBTZ-18 Low-Temperature Tensile Recovery Elasticity Testing Machine for Vulcanized Rubber (TR Test)

Description

Product Introduction:

The specimen is stretched at room temperature, then cooled to a sufficiently low temperature at which no recovery occurs upon removal of the tensile force. The tensile force is released, and the temperature is raised at a uniform rate. The temperature corresponding to a specified degree of recovery is measured. This instrument is designed and developed in accordance with the national standard GB/T 7758, which specifies the temperature‑retraction method (TR) for determining the low‑temperature properties of vulcanized rubber, and incorporates a compressor‑based refrigeration system. The equipment employs cascade compression refrigeration technology, leveraging the principle of thermal equilibrium and a circulating stirring mechanism to achieve automatic, uniform cooling and stable temperature control of the specimen.

Technical Specifications:

Project	Details
Temperature control range	Rt -70°
Temperature control error	±2℃
Temperature resolution	0.1℃
Cooling rate	About 2 hours or so
Displacement resolution	0.01mm
Elongation	0-175mm
Temperature fluctuation after reaching thermal equilibrium	Fluctuation within 3 minutes of the test is less than ±1°C.
Cold well dimensions	200×140×400mm (Length × Height × Width)
Release fixture system	Automatic release
Cooling medium	Ethanol or other antifreeze
Stirring motor	15W
Power supply	220V~240V, 50Hz, 2kW
Heating rate	1℃/min ± 0.2℃
Number of sample holders	Group 1, Group 3, Group 6 (optional)
Usage Environment Instructions	Use at room temperature (23–25°C); during operation, the side door may be opened to ensure proper heat dissipation from the compressor.

Specimen Requirements

The standard specimen is a strip with a broad, clamping‑friendly end, and its dimensions must meet the specified requirements. The initial length of the specimen shall be either 100 mm or 50 mm. A 100‑mm‑long specimen is suitable for testing materials with low elongation, whereas a 50‑mm‑long specimen is appropriate for materials with high elongation. Specimens are cut from flat test sheets having a thickness of 2.0 mm ± 0.2 mm using a sharp cutting blade; these test sheets may be prepared by molding or by cutting and grinding from finished products.

Test procedure:

1. The cooling tank shall be filled with an adequate amount of coolant to ensure that, during the test, the specimen is covered by at least 25 mm of liquid. In accordance with GB/T 9868, the coolant shall be cooled to −70 °C while being stirred.

2. While the liquid is cooling, place the specimen holder in the standard test temperature and stretch the initial length to the selected elongation value, then lock it in this position. Ensure that the specimen remains under tension at the standard laboratory temperature for the shortest possible duration.

3. The elongation may be selected according to the following principles:

1) Unless otherwise specified for technical reasons and to minimize the effects of crystallization, a concentration of 50% should be selected.

2) To investigate the combined effects of crystallization and low temperature, one of the following elongation values should be selected:

—250%;

— If 250% is not achieved, half of the elongation at break shall be used;

— If the elongation at break exceeds 600%, a value of 350% should be selected.

4. When the coolant reaches an equilibrium temperature between −70°C and −73°C, place the sample holder containing the specimen into the cooling bath and maintain it there for 10 ± 2 minutes at a temperature within the range of −70°C to −73°C. Release the locking mechanism of the upper clamp to allow the specimen to retract freely. Simultaneously, heat the liquid at a rate of 1°C/min, with a tolerance of 10°C ± 2°C over any 10‑minute interval. If the stretched specimen returns to its original length at −70°C, another cooling medium must be used to achieve a lower temperature.

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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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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?

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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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