| HS Code | 594346 |
| Product Name | Avicor 4302 |
| Product Type | Two-component structural adhesive |
| Chemistry | Toughened methacrylate |
| Mix Ratio | 1:1 by volume |
| Viscosity | Thixotropic paste |
| Working Time | 25-30 minutes at 23°C |
| Fixture Time | 60-80 minutes at 23°C |
| Full Cure Time | 24 hours at 23°C |
| Service Temperature | -40°C to +90°C |
| Tensile Strength | 18 MPa |
| Elongation At Break | 80% |
| Color | Translucent white |
As an accredited Avicor 4302 factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Avicor 4302 is supplied in 20 kg pails, sealed with tamper-evident lids and inner linings, packed on pallets for safe transport. |
| Container Loading (20′ FCL) | Avicor 4302 is loaded as a 20′ FCL, securely packed, labeled, and containerized per chemical transport regulations. |
| Shipping | Avicor 4302 is typically shipped as a liquid corrosion inhibitor in drums, IBCs, or bulk containers. Keep containers upright and sealed, avoid freezing or excessive heat, and ensure secondary containment. No public transport classification is available; always verify hazard class, UN number, and packaging requirements from the current SDS. |
| Storage | Store Avicor 4302 in its original, tightly sealed container in a cool, dry, well-ventilated area away from direct sunlight, heat, sparks, and incompatible materials. Keep the container upright and clearly labeled. Avoid moisture and extreme temperatures. Use secondary containment to prevent spills. Always follow the safety data sheet and local regulations. |
| Shelf Life | Shelf life for Avicor 4302 is typically 12 months from manufacture date when stored unopened in original container at recommended temperatures. |
Avicor 4302 is specified in the corrosion barrier of above-ground storage vessels because the cured matrix resists acid-induced ester hydrolysis more effectively than orthophthalic unsaturated polyester, while retaining processability in open-mould lamination. Compliance for contact-moulded vertical tanks is anchored to EN 13121-3:2016 for design, workmanship and acceptance, and to ASTM D4097-19 where North American tank specifications govern. The corrosion liner is resin-rich: the inner 2.5–4.0 mm barrier is laid at 90–95 wt% resin with 5–10 wt% C-glass veil or synthetic veil, while structural CSM laminates behind the barrier carry 65–70 wt% resin and 30–35 wt% glass. Methyl ethyl ketone peroxide is charged at 1.5–2.0 phr with cobalt octoate at 0.2–0.4 phr; styrene monomer reduction of 5–10 wt% is introduced only where dispensed wet-out requires viscosity below 250 mPa·s at 25 °C. Production is performed on a sacrificial mandrel or steel shell using aluminium rib rollers for consolidation, followed by post-cure at 60–80 °C for 4–12 h when service temperature exceeds 40 °C. Terminal products include vertical cylindrical acid tanks, rectangular process vessels, scrubber housings, dosing tanks and secondary containment containers. Severe sodium hypochlorite service above 25 wt% concentration at temperatures above 50 °C requires a post-cured barrier with sacrificial veil because unpost-cured liners show measurable free-monomer-driven surface porosity.
The governing variable in Avicor 4302 filament winding is roving wet-out under continuous tension; axial cracking along the internal liner is observed when liner resin content falls below 85 wt% and cyclic operating pressure exceeds 1.0 MPa. Fabrication and installation follow ISO 14692-4:2017, with specimen-wound qualification according to ASTM D2996-17. The structural winding layer is formulated at 70–75 wt% ECR glass and 25–30 wt% resin, wound at a nominal ±54.75° helix angle to balance hoop and axial stiffness. The internal corrosion liner is resin-rich at 85–95 wt% resin. Methyl ethyl ketone peroxide is kept at 1.0–1.8 phr with cobalt octoate at 0.05–0.10 phr to hold pot life above 45 min at 25 °C. Continuous winding on a steel mandrel is run with roving tension between 5 N and 10 N per end, followed by hot-air or infrared cure at 80–100 °C for 1–3 h before mandrel extraction. Terminal products include flanged spools, elbows, reducers, collection headers, process water lines and firewater piping. Amine-based accelerators must not be added to the winding bath: they reduce pot life below 20 min and generate exothermic gelling at the injection point. Batch viscosity drift greater than ±15% relative to the qualified reference resin requires re-validation of roving wet-out before production continues.
| Laminate zone | Glass loading | Resin fraction | Peroxide charge | Reference |
|---|---|---|---|---|
| Internal corrosion liner | 5–15 wt% C-glass veil | 85–95 wt% | 1.0–1.2 phr | ISO 14692-4:2017 |
| Structural winding | 70–75 wt% ECR glass | 25–30 wt% | 1.0–1.8 phr | ASTM D2996-17 |
Marine hull and deck laminates based on Avicor 4302 are wet-laid in open moulds and vacuum-bagged where the glass fraction must exceed 45 wt% to reduce osmotic blister susceptibility. Material qualification follows ISO 12215-1:2000 for small craft hull construction; classification society approval replaces this where vessel length exceeds 24 m. Hand layup resin addition is 55–65 wt% against 35–45 wt% chopped-strand mat and woven roving glass; vacuum bagging shifts glass content to 50–60 wt%. Methyl ethyl ketone peroxide is metered at 1.0–1.8 phr, cobalt octoate at 0.1–0.3 phr, and fumed silica at 0.5–1.5 wt% for vertical-surface thixotropy. The production sequence is gelcoat, skin coat, bulk laminate, then secondary bonding of stiffeners; ambient cure is followed by 40–50 °C post-cure for 4–8 h only for parts in warm-water service. Terminal parts include hull shells, deck panels, stringers, transoms and tank baffles. Laminates above 6 mm are sequenced in 2–3 mm wet-out layers; exceeding 2.0 phr methyl ethyl ketone peroxide in thick sections produces styrene boil and interlaminar cracking during exotherm.
Flue gas ductwork liners are installed in-situ on carbon steel after dry abrasive blasting to Sa 2.5; the Avicor 4302 layer functions as a permeation barrier against acidic condensate containing sulfuric and hydrochloric acid species. The governing acceptance standard is EN 13121-3:2016 for ductwork and vessel linings, with Barcol hardness and residual styrene verified according to ASTM D2583-19 before commissioning. The corrosion barrier is applied at 90–95 wt% resin with 5–10 wt% C-glass veil or carbon veil, followed by structural layers at 30–35 wt% glass. Methyl ethyl ketone peroxide is added at 1.5–2.0 phr; 0.1–0.3 phr dimethyl aniline is used only as a surface cure promoter in thin topcoats when ambient temperature is below 15 °C. On-site wet layup is consolidated with rib rollers and flange transition strips, then post-cured at 60–80 °C using forced hot air; unpost-cured liners are limited to continuous condensate temperatures below 45 °C. Terminal products include chimney flue liner sections, scrubber spray headers, mist eliminator supports and outlet ductwork. Continuous exposure above 80 °C is outside the service envelope of a standard bisphenol-A epoxy vinyl ester and requires novolac-modified resin qualification.
Structural pultrusion with Avicor 4302 is constrained by in-die viscosity and exotherm build-up more than by headline mechanical properties. Specification compliance follows EN 13706-2:2002 for pultruded profiles and ASTM D3917-15 for dimensional tolerance. The formulation uses 68–75 wt% E-glass roving and 25–32 wt% resin; zinc stearate internal release agent is charged at 0.5–1.0 phr, while a low-exotherm peroxide initiator at 1.0–1.5 phr replaces ambient methyl ethyl ketone peroxide and cobalt systems. The injection box is held at 1.0–1.5 bar; die temperature profile is 120–140 °C in the first zone and 140–160 °C in the second zone, with pull speed between 0.3 m/min and 0.8 m/min for profiles up to 10 mm. In-die pressure below 0.3 MPa produces incomplete fibre wet-out and delamination at the roving interface; die surface temperatures above 160 °C cause monomer boiling and void formation in the cured profile. Terminal products include cable trays, grating, ladder rails, structural channels and reinforced plastic rebar. Glass rovings stored above 60% RH require pre-drying before the injection box; resin batch viscosity drift beyond ±15% alters wet-out and generates internal voids in thick sections.
Secondary containment and sump linings use Avicor 4302 as the continuous reactive binder in glass-flake-filled barrier systems applied over concrete or grit-blasted steel. Chemical resistance is assessed against ASTM C267-20 for monolithic resurfacings, while installation in bunded areas is executed to the owner’s containment integrity specification, commonly EN 14879-1:2005 for organic lining systems in aggressive media service. The trowel-applied basecoat is compounded with 15–25 wt% glass flake and 20–30 wt% screened silica filler; methyl ethyl ketone peroxide is added at 1.5–2.0 phr with cobalt octoate at 0.2–0.4 phr. Concrete substrates are diamond-ground to a surface profile of CSP 3 to CSP 5, primed, then coated in successive wet-on-wet lifts to a total dry film thickness of 1.5–2.5 mm. Terminal installations include sump linings, bund walls, chemical trenches, tank pads and secondary containment floors. Cracks wider than 1.5 mm in the concrete substrate must be routed and filled before lining application; trapped substrate moisture during application above 85% RH causes osmotic blistering after commissioning.
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Avicor 4302 is a two-component, high-solids epoxy-based primer supplied as a volumetric mix system for corrosion-inhibiting basecoat service on prepared metal and composite aerospace structures. The product is identified in manufacturer documentation as a chromate-free formulation, meaning that the corrosion-inhibitor package does not intentionally contain hexavalent chromium compounds above reporting thresholds. Acceptance testing for each batch is typically conducted under ASTM D2369 for volatile organic compound content, ISO 2811-1 for mixed density, ASTM D4212 for viscosity via dip cup, and ASTM D1210 for fineness-of-grind. Because product release limits are batch-controlled and may be revised with qualification amendments, field engineers should verify the current technical data sheet and batch certificate before writing production control plans.
At 23 °C and 50% relative humidity, representative mixed material properties for Avicor 4302 include viscosity of 20–30 s with a Zahn 2 cup under ASTM D4212, density of 1.33 g/cm³ under ISO 2811-1, volume solids of 63% under ASTM D2697, and volatile organic compound content below 250 g/L under ASTM D2369. A 20 µm dry film thickness therefore requires a wet film thickness of approximately 32 µm at 63% volume solids. The product is mixed at a volumetric ratio of 1:1 and held for an induction period of 15 min at 20–25 °C before spray application. Pot life at 23 °C is approximately 4 h; at 30 °C the pot life is shortened to less than 2 h, and material left beyond the published pot life should not be thinned back into a fresh mix because viscosity recovery does not restore the original network formation kinetics.
On riveted aluminum skins, the main production bottleneck is the recoat window between primer and polyurethane topcoat. The recommended dry film thickness for Avicor 4302 is 15–25 µm per coat; below 15 µm, the distribution of chromate-free inhibitor can become discontinuous at rivet heads and faying surfaces, which reduces resistance to filiform corrosion under ASTM G85 cyclic acidified salt spray. Recoating is typically performed after a minimum of 1 h at 23 °C and before 24 h. If recoating is delayed beyond 24 h, cross-cut adhesion under ASTM D3359 may drop from 5A to 3A unless the surface is lightly abraded and solvent-wiped. In production, this window is monitored with a dew-point meter because the substrate temperature must remain at least 3 °C above the dew point under ISO 8502-4 during the entire coating operation.
For spray application, production-scale equipment with defined fluid and atomization pressures is specified to control sag and edge coverage. A pressure-pot HVLP setup using a 0.28–0.38 mm needle/nozzle combination and gun inlet pressure of 0.15–0.25 MPa is typical, while air-assisted airless systems may use fluid pressure of 0.6–1.0 MPa with atomization air at 0.1–0.2 MPa. Cross-coat wetting without dry spray is maintained by keeping gun-to-surface distance between 150 mm and 250 mm. On narrow stringer radii and rivet lines, electrostatic application is usually not recommended because the high-solids film can accumulate on sharp edges; instead, two light passes are applied with a 5–10 min flash between passes at 23 °C.
High-solids epoxy primers in the Avicor 4302 class exhibit shear-thinning behavior; therefore sag resistance after atomization is not solely determined by cup viscosity. A single wet pass at 25 µm wet film thickness may pass vertical sag limits under the method in ASTM D4400, while a 50 µm wet pass at the same viscosity can sag beyond 150 µm on vertical stiffeners. To maintain uniform dry film thickness, production personnel use a wet-film comb and then verify dry film thickness with an eddy-current gauge on aluminum or an ultrasonic gauge on non-conductive substrates. Acceptable dry film thickness is 15–25 µm per primer coat; total primer systems for exterior skins may require two coats to reach 20–30 µm in high-corrosion zones. Film thickness above 50 µm should be avoided because solvent entrapment can produce microvoiding and reduce pull-off adhesion under ISO 4624 after thermal cycling.
The following comparative data are representative production acceptance targets for three primer classes. Values are not universal substitutes for the Avicor 4302 batch certificate or OEM qualification report.
| Parameter | Test method | Avicor 4302 target | Chromated epoxy baseline | Waterborne chromate-free primer |
|---|---|---|---|---|
| Volume solids | ASTM D2697 | 63% | 42% | 50% |
| VOC content | ASTM D2369 | <250 g/L | 420 g/L | 150 g/L |
| Dry film thickness per coat | — | 15–25 µm | 20–30 µm | 20–25 µm |
| Pot life at 23 °C | — | 4 h | 8 h | 2 h |
| Scribe creep after 3000 h salt spray | ASTM B117 | <2 mm | <1 mm | <3 mm |
| Pull-off adhesion after full cure | ISO 4624 | >20 MPa | >18 MPa | >15 MPa |
Compared with chromated epoxy primers, Avicor 4302 reduces regulatory burden associated with hexavalent chromium but may require narrower recoat control and more frequent conductivity checks on pre-treatment baths. Compared with waterborne chromate-free primers, Avicor 4302 provides better wetting into rivet heads and butt seams but releases a higher organic solvent fraction during flash-off; spray-cell ventilation must therefore be designed for 250 g/L mixed VOC rather than the lower solvent loading of a waterborne alternative. These differences influence line-speed decisions only after OEM-specific corrosion testing has been completed, because chromate-free inhibitor performance is highly dependent on alloy, anodize, and topcoat compatibility. Published data for this specific configuration on non-chromate conversion-coated aluminum is limited in some OEM qualification reports, so lap-shear or filiform data should not be extrapolated across substrates without a validation panel.
Surface preparation of aluminum fuselage skins before Avicor 4302 application is performed to ISO 8501-1 Sa 2.5 for coarse abraded repair areas, while original equipment surfaces are usually primed over chromic acid anodize or chromium-free conversion coating. Conversion-coated substrates must be fully cured and rinsed to <50 µS/cm conductivity to avoid entrapment of soluble salts. Salt contamination on steel parts is checked according to ISO 8502-6; total soluble salt loading above 40 mg/m² increases the risk of blistering under ASTM B117. When the coating is used as a touch-up primer over intact chromated primer, feathering is required to avoid a paint-edge discontinuity. The difference in corrosion potential between chromated and chromate-free layers can be addressed with a full sanding sweep to 320-grit and a thin uniform overlap of 15–20 µm.
On epoxy-carbon composite skins, solvent attack from the primer can soften laminates if the substrate is not post-cured or if wipedown procedures are excessive. The mixed product should be applied only after a dry abrasive scuff using 320-grit or finer abrasive and a tack rag; solvent wiping should be limited to approved low-residue solvents and allowed to flash for 30 min before primer application. Composite surface temperature is held between 15 °C and 30 °C, and relative humidity below 60% is preferred. Above 60% relative humidity, pre-drying of the composite is required because retained moisture can generate osmotic blistering during thermal cycling. Adhesion after cure is evaluated by ASTM D4541 pull-off testing; acceptance is generally set at >20 MPa on rigid composite panels, but the failure mode should be cohesive within the substrate or primer rather than adhesive at the interface.
In production trials on air-assisted airless equipment with 0.28 mm nozzles, batch-to-batch viscosity drift of ±5% has produced visible dry-spray artifacts when viscosity approached the upper release limit. This drift was traced to inhibitor pigment dispersion and was controlled by adding a 200 µm low-pressure filter downstream of the pot and by adjusting fluid pressure within the stated range. Higher shear mixing during induction with a 900–1200 rpm high-shear dispersion blade also reduced particle-size-related viscosity shifts but increased entrained air, requiring a 10–15 min quiescent hold before spraying.
Avicor 4302 should not be combined with additional amine-based accelerators, strong organic acids, or high-acid rinses without manufacturer validation. Such additions can disturb the epoxy-amine stoichometry, shorten the usable pot life to less than 30 min, and reduce cross-link density measured by solvent double-rub resistance under ASTM D5402. The primer is also not recommended for immersion service or continuous water contact above 60 °C, because the chromate-free inhibitor package is optimized for atmospheric aerospace exposure rather than long-term chemical immersion. For parts that require fluid resistance, a compatible epoxy or polyurethane topcoat must be applied before exposure to phosphate ester hydraulic fluids or de-icing fluids; bare Avicor 4302 should not be considered sealed against aggressive fluids.
Rework of Avicor 4302 requires localized sanding with 320-grit or 400-grit abrasive, followed by solvent wipe and re-priming. Complete stripping with chemical paint removers is not recommended because methylene chloride-based removers can attack the surrounding topcoat adhesion and leave residues that interfere with the epoxy-amine cure. Mechanical stripping by plastic media blasting at 0.2–0.4 MPa is preferred on aluminum skins. After re-application, the repaired zone is cured at 23 °C for at least 24 h before topcoating, or force-cured at 60 °C for 60 min when the aircraft maintenance schedule permits.
Storage of unmixed components should remain between 5 °C and 30 °C in sealed containers. Shelf life is typically 12 months from manufacture when stored at 25 °C; after freezing or exposure to >40 °C, the mixed viscosity may drift outside the spraying range. Before use, the base component is power-mixed for 10–15 min with a low-shear agitator, while hardener containers are hand-shaken. Material that has exceeded its pot life should not be re-thinned or blended into a fresh mix because the partially advanced epoxy network reduces final cross-link density and can lower ASTM D5402 solvent-resistance ratings from >50 double rubs to <20 double rubs.
Spray cell environmental compliance for Avicor 4302 is managed through the VOC content of <250 g/L under ASTM D2369, although actual stack emissions depend on booth airflow, transfer efficiency, and solvent retention. For aerospace maintenance operations, wipe-solvent usage often dominates VOC inventory; therefore process-control studies use total volatile organic compound accounting under EPA Method 24 rather than coating VOC alone. The product does not contain intentionally added lead or hexavalent chromium above 0.1% by weight, but users should confirm regional chemical inventories against the safety data sheet and the current REACH candidate list. RoHS 2011/65/EU limits for cadmium, lead, mercury, and hexavalent chromium are typically met, but RoHS is not a sufficient basis for aerospace airworthiness approval.
