What Are the Most Important What Is the Testing Methods for Water Proof Putty to Ensure Durability and Performance in Industrial Applications?
In industrial applications (such as HVAC systems, pipe supports, sealing, and vibration damping), the failure of waterproof sealing putty components is often not due to "poor material quality," but rather a lack of verification of critical performance characteristics. If you are procuring waterproof putty, pipe hole sealants, or wall gap sealing materials, understanding core testing methods can directly reduce rework rates and long-term costs.
Why do waterproof putty tests determine product reliability?
Waterproof putty is subjected to the following over long periods in real-world applications:
- Continuous compression (sealing scenarios)
- High-frequency vibration (equipment operation)
- High-temperature/low-temperature cycling
- Corrosion from water, oil and chemical media
- Without targeted testing, even if initial performance is good, aging, cracking, or loss of sealing and waterproofing will occur within 3–6 months.
7 Key Waterproof Putty Testing Methods
1.Shore A Hardness Test: The Basic Gauge for Hardness & Softness Matching
Hardness is the most intuitive performance indicator of waterproof sealing putty, measured against the Shore A standard. Values below 50A lead to easy deformation and insufficient support; values above 70A result in poor sealing fit and ineffective shock absorption. For HVAC system sealing and shock absorption components, the optimal range is 50–70 Shore A, balancing sealing tightness and elastic cushioning for mainstream applications such as pipe connections and fan vibration isolation.
Langfang Ruidi Case: When undertaking the customized production of waterproof putty for a well-known air-conditioning brand (one of Langfang Ruidi's long-term cooperative customers including LG ), we strictly controlled the Shore A hardness of the products within the range of 55–65A through pre-production hardness testing. This not only ensures the sealing and waterproof effect of the air-conditioning outdoor unit but also avoids equipment noise caused by excessive hardness or component damage caused by insufficient support. Up to now, the batch of products has been put into use for 3 years, with a failure rate of less than 0.1%.
2.Tensile Strength & Elongation at Break: Guarantees for Tensile & Impact Resistance
This test evaluates waterproof sealing putty's core ability to resist tension and fracture. High tensile strength prevents tearing under stress, making it suitable for pressure-bearing parts like pipe clamps and dynamic connectors. High elongation at break delivers excellent toughness to withstand impact, vibration, and deformation. Industrial-grade waterproof putty typically requires tensile strength ≥ 10 MPa and elongation ≥ 300% to meet dynamic operating demands.
Langfang Ruidi Case: For the waterproof putty customized for the automotive industry, Langfang Ruidi conducted strict tensile strength and elongation at break tests. The final products achieved a tensile strength of 12.5 MPa and an elongation at break of 380%, far exceeding the industry standard. These putty products are used in the connection of automotive engine pipelines, effectively resisting the tension and vibration generated during vehicle operation. They have been recognized by well-known automotive brands and have been mass-produced and supplied continuously.
3.Compression Set: The "Golden Indicator" of Waterproof Sealing Durability
As the most critical test for waterproof sealing putty, compression set measures the putty's elastic recovery after long-term compression. Lower values mean stronger resilience and longer sealing life; values exceeding 30% carry high risks of seal failure, air leakage, and water leakage. Strict control of this parameter is mandatory for applications including HVAC pipe seals, wall hole sealants, and rubber gaskets - it directly determines how long a product remains effective in waterproofing.
Langfang Ruidi Case: In the production of air-conditioning pipe waterproof putty for a large HVAC project, Langfang Ruidi took compression set as the core control indicator, strictly controlling the value below 20% through formula optimization and process adjustment. After 1,000 hours of long-term compression testing, the putty still maintained excellent rebound performance, without air leakage or water leakage. This project has been in stable operation for 5 years, and the sealing performance of the waterproof sealing putty has not degraded, fully verifying the durability advantage of our products.
4.Heat Aging Test: Verification of Stability in High-Temperature Environments
This test simulates long-term high-temperature conditions (e.g., 125℃ × 70h) to evaluate changes in hardness, tensile properties, and surface conditions of waterproof putty after aging. HVAC and thermal equipment operate under continuous high-temperature cycles; heat aging that causes sharp increases in hardness, drops in strength, or surface cracking will directly lead to seal failure.
Langfang Ruidi Case: When developing high-temperature-resistant waterproof putty for thermal energy equipment, Langfang Ruidi conducted a 125℃ × 70h heat aging test. The tested putty (made of EPDM material) had a hardness change rate of less than 8% and a tensile strength retention rate of more than 90%, without surface cracks. These putty products are currently used in the heat exchange system of a large thermal power plant, operating stably in a high-temperature environment for a long time.
5.Ozone Aging Test: Critical Protection Against Outdoor Cracking
Designed for outdoor units and exposed piping using waterproof putty, this test accelerates aging in a simulated ozone environment. Putty exposed outdoors is prone to ozone erosion, resulting in microcracks and premature failure. Ozone aging testing helps select ozone-resistant materials, eliminating short service life and cracking in outdoor use and extending the lifespan of exposed components.
Langfang Ruidi Case: For the exposed pipe waterproof putty of outdoor air-conditioning units, Langfang Ruidi conducted strict ozone aging testing. The products were placed in a simulated ozone environment (concentration 50pphm, temperature 40℃) for 72 hours, with no microcracks on the surface and no significant change in performance. These putty products have been used in outdoor air-conditioning units in coastal areas for 4 years, effectively resisting ozone erosion and ensuring the service life of the equipment.
6.High & Low Temperature Resistance: Adaptation to Extreme Environments
This test verifies that waterproof putty remains crack-free at low temperatures and non-softening at high temperatures. Extreme conditions impose strict requirements on materials, from frigid northern winters to hot southern summers and frequent temperature fluctuations during equipment startup and shutdown.
Langfang Ruidi Case: Aiming at the harsh climate conditions in northern China, Langfang Ruidi developed waterproof putty for outdoor pipelines, which passed the high and low temperature resistance test. The products remained elastic without brittle fracture at -30℃ and did not soften or flow at +70℃. These putty products are currently used in the outdoor pipeline system of a northern oilfield, adapting to the extreme temperature difference of -40℃ to +35℃ in the region, and have been in stable operation for 2 years.
7.Oil & Chemical Corrosion Resistance: Stability Test for Industrial Conditions
Aimed at industrial pipelines, compressors, and lubricating oil systems, this test assesses waterproof putty stability in oils and chemical media. Materials with poor oil resistance easily swell, soften, and lose strength, causing leaks and malfunctions.
Langfang Ruidi Case: For the waterproof putty used in compressor systems of a chemical enterprise, Langfang Ruidi conducted oil resistance testing. After soaking in lubricating oil at 80℃ for 24 hours, the volume change of the putty was only 6.2%, and the tensile strength retention rate was 92%, fully meeting the requirements of the chemical industry. These putty products have solved the problem of frequent seal failure in the customer's compressor system, reducing the maintenance cost by 30% for the customer. As an enterprise with import and export qualifications, we also provide such high-performance oil-resistant putty products for overseas customers.
How to determine if a waterproof putty wholesale supplier is reliable?
When purchasing, it's recommended to directly ask:
- Do they provide a complete compression set test report for waterproof sealing putty?
- Do they have valid aging test data of no less than 72 hours?
- Do they support material customization such as EPDM, NBR and silicone?
- Do they have mature application cases in HVAC and industrial engineering projects?
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