Waterproof Performance Testing of Polyaspartic

The waterproof performance of polyaspartic needs to be verified through systematic testing, covering basic properties, long-term weather resistance, and simulation of actual working conditions.

Basic Waterproof Performance Testing

1.Permeability Resistance Test

Testing Method:

Hydrostatic Pressure Method (GB/T 23446): Place the coating sample in a permeable device, apply water pressure (0.1–2.5 MPa), and record the maximum pressure value at which water begins to permeate.

Permeability Height Method: Place the sample vertically, inject water at the bottom, and measure the height of water penetration.

Polyaspartic Performance:

Due to its 100% solid content and seamless film formation, it typically withstands water pressure >1.5 MPa (equivalent to a depth of 150 meters underwater), far exceeding traditional materials (e.g., SBS membranes, which handle around 0.3 MPa)

2.Water Absorption Rate Test

Testing Method: Immerse the sample in water for 24 hours and calculate the percentage of weight gain.

Polyaspartic Performance: Water absorption rate <1% (traditional polyurethanes are around 3-5%), due to its dense cross-linked network that blocks moisture penetration.

Mechanical Properties and Durability Testing

1.Elastic Recovery and Crack Resistance

Testing Items:

Tensile Strength & Elongation at Break (GB/T 528): Stretch the sample until it breaks, recording the strength (MPa) and elongation rate (%).

Crack Bridging Ability: Apply the coating to a pre-cracked substrate (crack width 0–3mm) and observe whether water permeates.

Polyaspartic Performance:

Tensile strength >15 MPa, elongation at break >300% (up to 450%).

Can bridge dynamic cracks of up to 3mm (the coating does not rupture during substrate expansion and contraction).

2.Bond Strength

Standard: GB/T 5210

Method: Bond the coating to concrete/metal substrates and test the pull-off strength.

Key Points: Test bond strength in dry, wet, and after heat aging conditions.

Polyaspartic Performance:

Bond strength to concrete substrates >3.0 MPa (wet >2.5 MPa).

Strong molecular permeability, capable of anchoring micro-pores in the substrate.

Environmental Resistance Testing

1.Weather Resistance (UV/Heat-Oxidation Aging)

Testing Method: QUV Accelerated Aging (ASTM G154): Simulate UV + condensation cycles (1000–4000 hours). Heat Air Aging (GB/T 7141): Place in an oven at 70–150°C for 28 days.

Evaluation Indicators: Color difference (ΔE), chalking grade, strength retention rate (>80% is acceptable).

Polyaspartic Advantage: Aliphatic structure resists UV, with ΔE <2 and strength retention >90% after 4000h QUV testing.

2.Chemical Corrosion Resistance

Testing Method: Immerse in acid (5% H₂SO₄), alkali (5% NaOH), salt (3% NaCl), and oil (diesel) for 30 days.

Evaluation Indicators: Weight change rate (±2%), hardness change, and whether bubbling or peeling occurs.

Polyaspartic Performance: Excellent resistance to acids, alkalis, and salts, with a weight change rate <1%; excellent oil resistance (suitable for oil storage floors).

Extreme Condition Simulation Testing

1.Thermal Cycling (-40°C to 120°C)

Method: Freeze the sample at -40°C for 2 hours → equilibrate at room temperature → bake at 120°C for 2 hours, repeated for 20 cycles.

Evaluation: Check for cracking, debonding, or chalking.

Results: Polyaspartic, due to its high elasticity and low glass transition temperature (Tg < -40°C), shows no cracking.

2.Dynamic Water Pressure + Crack Simulation

Equipment: Crack simulation device + water pressure apparatus (e.g., Germany's PROET waterproof testing machine).

Method: Substrate cracks open and close cyclically (0–1.5mm) while applying 0.5 MPa water pressure for 30 days.

Polyaspartic Performance: Due to its elastic deformation ability, it can expand and contract with cracks without leaking water (traditional rigid materials fail easily).

Application-Specific Tests

1.Roof Waterproofing

Wind Uplift Test (EN 16002): Simulate strong wind negative pressure (≥5 kPa), the coating does not delaminate.

Nail Puncture Self-healing: Observe the self-sealing effect after a nail punctures the coating (polyaspartic elastically encapsulates the nail and prevents water leakage).

2.Underground Engineering

Root Penetration Resistance (FLL Standard): Test for penetration by plant roots (e.g., bamboo roots) in green roofs, polyaspartic passed certification.

3.Water Pools/Drinking Water

Hygienic Safety: GB 5749 "Standard for Drinking Water" immersion test (heavy metal leaching).

Polyaspartic, after curing, is non-toxic and has no leaching, meeting requirements for drinking water contact materials.

Comparison of Test Results (Polyaspartic vs Traditional Materials)

Recommended Authoritative Testing and Certification

ASTM C1305 (Waterproofing performance for concrete surfaces).

EN 14891 (Waterproofing systems for tile adhesives).

Note: Attention should be paid to "Engineering Application Compatibility" when sending for testing:

①Substrate type (concrete/metal/wood).

②Application thickness (1.5–2.0mm is the standard test thickness).

③Curing conditions (standard curing at 23°C for 7 days).

Core Validation Logic of Polyaspartic Waterproof Performance

Through the above systematic testing, the seamless film formation, high elastic recovery, chemical inertness, and weather resistance of polyaspartic collectively contribute to its "lifetime waterproof" capability, particularly suitable for harsh environments such as irregular structures, large temperature differences, and strong corrosion.

Feiyang has been specializing in the production of raw materials for polyaspartic coatings for 30 years and can provide polyaspartic resins, hardeners and coating formulations.
Feel free to contact us: marketing@feiyang.com.cn

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