Products Tested for Hail Impact: Standards, Methods & Applications
Hailstorms cause billions of dollars in property damage annually across the United States, affecting roofing materials, solar panels, automotive body panels, siding, skylights, and outdoor equipment. Hail impact testing subjects products to controlled simulated hailstone impacts to evaluate resistance to cracking, denting, shattering, and functional degradation. Passing hail impact certification enables manufacturers to market durable, weather-resistant products and qualifies homeowners for insurance discounts. For companies seeking hail impact testing at a US-based testing lab, Infinita Lab provides comprehensive product testing through its accredited laboratory network.
How Hail Impact Testing Works
Testing typically involves launching ice or steel balls of specified diameter and mass at the product surface at controlled velocities that simulate the terminal velocities of natural hailstones. The applicable standard defines impact locations, angles, number of impacts, and specimen temperature. Post-impact evaluation assesses cracking, penetration, shattering, functional damage, and cosmetic defects.
Products Commonly Tested for Hail Impact
Roofing Materials
Asphalt shingles, metal roofing, clay and concrete tiles, and synthetic roofing products undergo UL 2218 Class 1–4 rating (steel ball impact) or FM 4473 (ice ball impact) testing. Class 4-rated products resist the largest simulated hailstones and often qualify for insurance premium reductions in the construction sector.
Solar Panels and Photovoltaic Modules
IEC 61215 and UL 1703 require PV modules to withstand impact from 25 mm ice balls at 23 m/s without cell cracking or loss of power output. Hail resistance ensures system durability over 25+ years of service life in the renewable energy industry.
Automotive Body Panels and Glass
Vehicle body panels, windshields, and exterior trim undergo hail-simulation testing to evaluate dent resistance, glass-breakage thresholds, and paint damage in the automotive industry.
Siding and Exterior Building Products
Vinyl siding (ASTM D3679), fibre cement, and composite siding products undergo impact resistance testing to verify durability against hailstone strikes in severe weather regions.
Why Choose Infinita Lab for Hail Impact Testing?
At the core of this breadth is our network of 2,000+ accredited labs in the USA, offering access to over 10,000 test types. From advanced metrology (SEM, TEM, RBS, XPS) to mechanical, dielectric, environmental, and standardised ASTM/ISO testing, we give clients unmatched flexibility, specialisation, and scale. You are not limited by geography, facility, or methodology—Infinita connects you to the right testing, every time.
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Frequently Asked Questions (FAQs)
What is hail impact testing? Hail impact testing evaluates product resistance to simulated hailstone impacts using ice balls or steel balls launched at controlled velocities. It certifies durability for roofing, solar panels, automotive, and building products.
What is UL 2218 Class 4 hail rating? UL 2218 Class 4 is the highest hail-impact rating for roofing materials, requiring resistance to a 2-inch-diameter steel ball dropped from 20 feet. Class 4 roofing often qualifies homeowners for insurance discounts.
What standards cover solar panel hail testing? IEC 61215 requires photovoltaic modules to withstand impacts from 25 mm ice balls at 23 m/s. Some manufacturers test to larger hail sizes (35–45 mm) for enhanced durability certification in hail-prone regions.
Are ice balls or steel balls used for testing? FM 4473 uses ice balls to create a more realistic simulation. UL 2218 uses steel balls for repeatability and ease of use. Both approaches evaluate impact resistance but may produce different rankings for some materials.
Which regions require hail-resistant products? The central United States (Texas, Colorado, Nebraska, Kansas, Oklahoma) experiences the highest hail frequency. Many insurers and building codes in these regions require or incentivize the use of hail-resistant roofing and building products.
