Plastic-coated net inspection service

Plastic-Coated Net Inspection Service – Comprehensive Quality and Performance Validation for Brazilian Agricultural, Construction and Industrial Applications

As an ISO/IEC 17025 accredited independent testing laboratory, we offer comprehensive inspection services for plastic‑coated nets used across Brazilian agriculture (poultry cages, fruit and vegetable trellising), construction (safety netting, scaffolding debris nets), aquaculture (fish cages, predator nets), sports (tennis court barriers, football goal nets), and logistics (pallets and load containment). The plastic coating – typically PVC, PE, or polyurethane – provides corrosion resistance, UV stability, and mechanical protection to the underlying metal (steel, galvanised iron, or aluminium) or synthetic (polyester, nylon) core. However, coating uniformity, adhesion, thickness, tensile strength, grid consistency, and environmental durability are critical for long‑term performance in Brazil's tropical and subtropical conditions. Our inspection protocols evaluate dimensional accuracy, coating quality, mechanical properties, UV resistance, and chemical stability using standardised methods. All procedures are aligned with ABNT NBR standards, ASTM D638 (Tensile properties of plastics), ASTM D3363 (Film hardness), ASTM D3359 (Adhesion), ASTM D4060 (Abrasion resistance), ISO 9227 (Salt spray), ASTM G154 (UV weathering), ISO 4892‑3 (Xenon‑arc exposure), and ABNT NBR 11861 (Wire mesh standards). Our inspection reports are recognised by INMETRO (product certification), ABNT (technical compliance), IBAMA (environmental compliance for aquaculture), MAPA (agricultural applications), and Brazilian engineering, construction and agricultural firms for quality assurance, supplier qualification and regulatory compliance.

Types of Plastic‑Coated Nets and Components We Regularly Inspect

Our inspection facilities accommodate a wide range of net constructions, core materials, coating types, and mesh geometries. Typical test articles include:

• Welded wire mesh with PVC or PE coating – for animal enclosures, fencing, and building reinforcement
• Knotted and knotless nets with plastic coating – for aquaculture cages, bird protection, and shade structures
• Extruded and dipped plastic‑coated netting – for safety barriers, fall protection, and sports applications
• Galvanised steel core nets with heavy‑duty polymer coating – for coastal and corrosive environments
• Polyester or nylon core nets with plastic coating – for fishing, cargo restraint, and stadium barriers
• Pre‑stretched and heat‑set plastic‑coated nets – for dimensional stability under load
• Custom and experimental net constructions – for R&D and new product development

Dimensional and Mesh Geometry Inspection – Grid Consistency and Wire/Thread Dimensions

• Mesh size and opening measurement (ABNT NBR 11861 / ISO 9044 / ASTM E11 adapted) – Using a calibrated calliper or an optical measuring system (with a graduated reticle), we measure the mesh opening (distance between adjacent wires or strands) in both the warp and weft directions. Measurements are taken at a minimum of 10 random points across the net. The average opening, the standard deviation, and the coefficient of variation (CV) are reported. For Brazilian agricultural nets, a CV of less than 5 % is typically required for consistent bird/predator exclusion and effective crop support.
• Wire or strand diameter measurement (ABNT NBR 11861 / ISO 8430) – We measure the diameter of the metallic core (if applicable) and the total diameter (core + coating) using a micrometer (accuracy ±0.001 mm) at 10 points along the strand. The coating thickness is calculated as the difference between the total diameter and the core diameter. A coating thickness variation of more than ±15 % from the nominal value is flagged as a potential quality issue, as it may affect corrosion resistance and mechanical durability.
• Mesh count (number of openings per unit length) and open area percentage – We count the number of openings per metre (or per 100 mm) in both directions and calculate the total open area as a percentage of the total net area. The open area is critical for applications such as shading, where a specific percentage (e.g., 70‑90 %) is required for crop protection or animal welfare.
• Squareness and diagonal measurement (ASTM E11 / ABNT NBR 11861) – We measure the length of the diagonals of a representative section (e.g., 1 m × 1 m) to check the squareness of the net. A difference of more than 5 mm between the two diagonals is reported as an out‑of‑square condition, which would affect the installation and the load distribution in Brazilian construction and agricultural applications.

Coating Quality and Integrity – Thickness, Adhesion and Porosity Assessment

• Coating thickness measurement – contact and non‑destructive (ISO 2808 / ASTM D4138 / ABNT NBR 14042) – We measure the coating thickness on both the wire/strand surface and at the intersection points (knots or welds) using a magnetic or eddy‑current gauge (for metallic cores) or a digital calliper (for synthetic cores). The average coating thickness, the minimum thickness (at the most critical locations), and the standard deviation are reported. For Brazilian coastal and aquaculture applications, a minimum coating thickness of 0.5 mm (or 0.8 mm for heavy‑duty) is typically required to ensure long‑term corrosion protection.
• Coating adhesion – cross‑cut and peel tests (ASTM D3359 / ISO 2409 / ABNT NBR 15044) – We perform a cross‑hatch cut on the plastic coating (using a multi‑blade cutter) and apply a pressure‑sensitive tape to assess the adhesion. A rating of 4B or 5B (on the 0‑5 scale) is required for Brazilian high‑performance nets. For coated wires, we also perform a peel test by cutting a strip of the coating and pulling it off at a 90° angle (at 50 mm/min) while recording the peel force (in N/cm). A peel force of less than 10 N/cm is considered insufficient for most agricultural and industrial applications.
• Porosity and pinhole detection (ASTM D5162 / ISO 29601 / ABNT NBR 15699) – We use a high‑voltage spark tester (porosity detector) to identify any pinholes, cracks, or bare spots in the plastic coating. The coating is considered to have failed if more than 1 pinhole per metre is detected. This is especially critical for nets used in Brazilian high‑humidity and corrosive environments, such as coastal animal enclosures and aquaculture cages.
• Coating uniformity at intersection points (knots and welds) – We examine the coating at the nodes (where wires cross) under a magnifying glass or a microscope. We check for any thinning, cracking, or exposed metal at the weld points. The coating thickness at the nodes is measured separately and compared to the thickness on the straight sections; a reduction of more than 30 % is reported as a potential weak point, which is a common issue in Brazilian welded mesh products.

Mechanical Properties – Tensile Strength, Puncture Resistance and Abrasion

• Tensile strength of the net (ASTM D638 / ISO 13934‑1 / ABNT NBR 14707) – We cut specimens from the net (including both the warp and weft directions) and test them in a universal testing machine at a crosshead speed of 100 mm/min. The maximum force (in N or kN) and the elongation at break (in %) are recorded. The tensile strength is expressed as force per unit width (e.g., N/50 mm). For Brazilian heavy‑duty safety nets, a tensile strength of ≥ 1,500 N/50 mm is typically required.
• Puncture and tear resistance (ASTM D4833 / ISO 13937‑2 / ABNT NBR 16188) – We perform a puncture test using a standard probe (e.g., a 6‑mm diameter steel ball) on a coated net specimen, and record the maximum force (in N) at the point of perforation. We also perform a tear test (trouser or tongue tear) by cutting a slit in the net and measuring the force required to propagate the tear. A puncture resistance of ≥ 200 N and a tear strength of ≥ 100 N are typically required for Brazilian nets used in fall protection and debris containment.
• Abrasion resistance of the coating (ASTM D4060 / ISO 9352 / ABNT NBR 16012) – We mount a coated wire or strand specimen on a Taber abraser (with CS‑10 or H‑18 wheels and a 500‑g load) and run it for 500 cycles. The weight loss (in mg) and any visible wear or exposure of the substrate are reported. A weight loss of less than 10 mg per 1,000 cycles is considered acceptable for Brazilian nets used in high‑friction applications (e.g., animal rubbing, cargo handling).
• Knot strength and weld strength (for knotted and welded nets) – We perform a knot pull‑out test by clamping the knot and pulling the strand out of the knot at a speed of 50 mm/min, recording the maximum force (in N). For welded nets, we measure the shear strength of the weld joint. A knot or weld strength of less than 80 % of the strand tensile strength is reported as a structural weakness.

Environmental and Weathering Resistance – UV, Salt Spray and Humidity

• UV resistance and accelerated weathering (ASTM G154 / ISO 4892‑3 / ABNT NBR 15936) – We expose coated net specimens to UVA‑340 lamps (0.89 W/m², 60 °C, dry/condensation cycles) for 500, 1,000 and 2,000 hours. After exposure, we measure the tensile strength retention, the colour change (ΔE*), and any visible cracking, chalking, or loss of gloss. A tensile strength retention of ≥ 80 % after 1,000 hours is typically required for Brazilian nets used in outdoor agricultural and safety applications. We also report any significant reduction in elongation or any embrittlement of the coating.
• Salt spray corrosion test (ASTM B117 / ISO 9227 / ABNT NBR 8096) – We expose coated net samples (with a cut edge to simulate damage) to a 5 % NaCl fog at 35 °C for 240, 500 and 1,000 hours. After exposure, we inspect the cut edge and the intact coating for any under‑cutting corrosion (creepage), blistering, or red rust formation on the metal core. For Brazilian coastal and aquaculture nets, a resistance of ≥ 500 hours without red rust is typically required.
• Humidity and condensation resistance (IEC 60068‑2‑78 / ABNT NBR IEC 60068‑2‑78) – We place coated nets in a humidity chamber at 40 °C and 95 % RH for 168 hours, and then inspect for any blistering, loss of adhesion, or softening of the plastic coating. Any visible defect is reported, and the percentage of the surface affected is measured.
• Thermal cycling and ageing (IEC 60068‑2‑14 / ABNT NBR IEC 60068‑2‑14) – We subject coated net specimens to thermal cycles from ‑10 °C to +70 °C (simulating Brazilian climatic extremes) for 100 cycles, and then measure the tensile strength and the coating adhesion. A retention of ≥ 85 % in tensile strength and a 4B adhesion rating are required for Brazilian outdoor nets.

Specialised Chemical and Biological Resistance – For Agricultural and Aquaculture Applications

• Resistance to agricultural chemicals – pesticides and fertilisers (ISO 175 / ASTM D543 adapted) – We immerse coated net specimens in solutions of common Brazilian agrochemicals (e.g., glyphosate, 2,4‑D, urea, ammonium sulfate) at the recommended application concentrations for 72 hours. We then measure the tensile strength retention and any change in surface hardness or colour. A retention of ≥ 90 % of the original tensile strength is required for Brazilian agricultural nets.
• Resistance to salt water and aquaculture disinfectants – (ASTM D543 / NBR 15713 adapted) – For nets used in fish farming, we immerse specimens in synthetic seawater (ASTM D1141) and in solutions of common disinfectants (e.g., hydrogen peroxide, potassium permanganate) for 7 days. The weight change, tensile strength retention, and any signs of chemical attack (swelling, cracking) are reported.
• Resistance to biological fouling – algae and marine organism adhesion (ASTM G142 / NACE TM0384 adapted) – For aquaculture nets, we perform a field immersion test (or a laboratory simulation) to assess the rate of biofouling (algal growth and attachment of organisms) on the coated surface. The percentage of the surface covered by fouling after 30 days is reported. A coating with less than 20 % fouling cover is considered to have good anti‑fouling characteristics for Brazilian tropical waters.
• Resistance to bird and animal pecking / chewing (mechanical durability simulation) – We simulate the mechanical action of animals (pecking, chewing, or scratching) using a reciprocating abrasion test with a standard abrasive (e.g., a hard rubber or a steel brush) and measure the depth of wear after a defined number of cycles. A wear depth of less than 0.3 mm is considered acceptable for Brazilian poultry and predator nets.

Report Acceptance & Compliance with Brazilian Agricultural, Construction and Environmental Standards

All plastic‑coated net inspections described above are conducted under our ISO/IEC 17025:2017 accreditation, using calibrated thickness gauges, tensile testing machines, UV chambers, salt spray cabinets, and analytical instruments, all traceable to INMETRO and international reference standards. Our final inspection reports include: a comprehensive description of the net construction (core material, coating type, mesh geometry), a summary of all measured parameters (mesh size, wire diameter, coating thickness, adhesion rating, tensile strength, tear strength, UV retention, salt spray rating), statistical summaries (mean, standard deviation, coefficient of variation), photographic evidence of any defects or failures (pinholes, corrosion, cracking), and a clear pass/fail verdict against your specified acceptance criteria (e.g., tensile strength ≥ 1,500 N/50 mm, coating thickness ≥ 0.5 mm, salt spray resistance ≥ 500 hours). We also provide an expanded uncertainty (k=2) for all key quantitative measurements. These reports are widely accepted by INMETRO for product certification of agricultural and safety nets, by ABNT for normative compliance (NBR 11861, NBR 14707), by MAPA for agricultural input registration, by IBAMA for environmental compliance of aquaculture equipment, and by Brazilian engineering, construction, and agricultural firms for supplier qualification, project specification and quality assurance. Bilingual (Portuguese/English) versions are available to facilitate submissions to regulatory bodies and to support your engineering, procurement and quality teams. With our rigorous and comprehensive inspection service, you can confidently ensure that your plastic‑coated nets meet the demanding performance and durability requirements for the Brazilian agricultural, industrial and coastal environments.