| HS Code | 131086 |
| Product Type | Solar Control Window Film |
| Base Substrate | Polyethylene Terephthalate (PET) |
| Thickness | 2 mil (50 microns) |
| Adhesive | Pressure-Sensitive Acrylic |
| Uv Rejection | 99% |
| Solar Heat Rejection | Up to 60% |
| Visible Light Transmission | Variable by shade (e.g., 35%) |
| Glare Reduction | Up to 80% |
| Tensile Strength | High-strength polyester base |
| Scratch Resistance | Hard-coated outer layer |
As an accredited EVERLAM COOL factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | EVERLAM COOL is packaged in a 20-liter HDPE jerry can with a tamper-evident seal and clear chemical safety labeling. |
| Container Loading (20′ FCL) | Container Loading (20′ FCL): A 20-foot full container load of EVERLAM COOL chemical, securely packed, stowed, and documented for safe transport. |
| Shipping | Ship EVERLAM COOL in sealed, leak-proof, UN-approved containers, upright and securely braced. Protect from moisture, heat, and physical damage. Label with product name, hazard warnings, and include Safety Data Sheets. Follow applicable ADR, IMDG, or IATA regulations, ensure personnel training, and verify container compatibility before transport. |
| Storage | Store EVERLAM COOL in tightly sealed original containers in a cool, dry, well-ventilated area, out of direct sunlight. Keep away from ignition sources, heat, and strong oxidizers. Maintain storage temperatures between 5°C and 35°C; do not allow freezing. Protect from moisture and physical damage, check expiry dates, and rotate stock. |
| Shelf Life | EVERLAM COOL has a shelf life of 12 months when stored unopened in a cool, dry place away from heat and moisture. |
In crystalline silicon module manufacturing, the layup is assembled as glass / encapsulant / cell circuit / encapsulant / backsheet or rear glass. If EVERLAM COOL is specified as the EVA-based interlayer designated for reduced-temperature lamination, the platen setpoint is shifted from the conventional 150–155 °C band to 135–145 °C, but only after thermocouple placement at three positions across the cell plane confirms that the module core remains above 120 °C for at least 4 min. Cure completion is tracked by solvent extraction in boiling xylene for 5 h; gel content below 75 % is associated with higher damp-heat failure rates after 1000 h at 85 °C / 85 % RH under IEC 61215-1:2021. The formulation usually carries 0.1–0.3 phr silane adhesion promoter and 0.05–0.15 phr antioxidant, though silane loading must be revalidated when the rear cover shifts from PVF/PET/PVF to polyolefin elastomer because the peel interface chemistry changes. Volume resistivity is required to remain above 1×1013 Ω·cm per ASTM D257-14, and post-cure optical transmittance should exceed 90 % per ASTM D1003-21. The dominant field defect in continuous lamination is edge void formation at stringer ribbon transitions when the vacuum ramp exceeds 8 kPa/min; therefore the first-stage vacuum plateau is set at 60–80 kPa for 5–7 min before chamber venting and the second-stage cure pressure is applied. The terminal finished product is a c-Si photovoltaic module that must also pass wet leakage current and insulation resistance limits under IEC 61730-2:2016, with no allowance for visual edge voids extending more than 1.0 mm from the cell edge.
Architectural laminators using vacuum-bag ovens run a different thermal trajectory than PV laminators because glass thickness and edge heat loss retard interlayer temperature by 5–10 K. A 6 mm / 0.76 mm interlayer / 6 mm annealed glass stack in a forced-air vacuum bag normally reaches an interlayer plane temperature of 130–138 °C only after 45–60 min when the oven air setpoint is 145 °C. That cycle is not interchangeable with short-dwell platen lamination. Compliance is assessed under EN ISO 12543-2:2021 for laminated safety glass, and adhesion is measured by the pummel test method in EN ISO 12543-4; values below 30 pummel units indicate weak glass retention, while values above 60 pummel units shift the fracture mode from ductile to brittle and increase spall in pendulum impact. Interlayer thickness is selected from opening span and load: a 1.52 mm EVA interlayer is the minimum normally submitted for point-fixed balustrades where residual post-breakage strength is specified. Terminal products include overhead canopies, skylights, and interior glass partitions that must achieve the 2B2 classification of EN 12600. REACH SVHC screening under 1907/2006/EC is a standalone documentation requirement for architectural glass sold in EU member states.
In impact-grade fenestration, EVA-based interlayer stacks are validated by cyclic pressure after missile impact. The product is normally laminated as a multi-layer stack with total interlayer thickness of 1.52 mm or 2.28 mm; 0.76 mm single-ply films generally fail to retain glass fragments at large-missile levels of ASTM E1996-20. Lamination must produce void-free edges because the edge deletion zone for structural glazing is usually 10–15 mm and is sealed against moisture ingress after cutting. The vacuum-bag cycle includes a slow ramp from ambient to 90 °C over 20–25 min to exhaust trapped air before final cure at 135–140 °C for 45 min. Pressure cycling after missile impact is conducted according to ASTM E1886-19; the assembly is subjected to positive and negative cycles with an allowable deflection limit of L/60. Terminal products are hurricane-resistant windows and doors for coastal commercial buildings. The interlayer should not be paired with low-iron glass that exposes unprotected interlayer edges to direct UV, because south-facing exposure can produce discoloration within 12–18 months unless UV stabilizer loading is confirmed by ISO 4892-3 xenon arc testing; published data for this exact configuration is limited.
| Test method | Loading condition | Evaluation criterion |
|---|---|---|
| ASTM E1996-20 | large missile 2.7 kg timber at 9.1 m/s | no penetration of impactor or glass fragments beyond interior plane |
| ASTM E1886-19 | cyclic pressure after impact | no opening greater than 76 mm in any direction |
| TAS 201 | large missile impact | no tear in interlayer exceeding 12.7 mm |
| TAS 202 | cyclic wind pressure | no disengagement of glass from frame |
Decorative embedded-mesh and textile laminates introduce a different defect matrix than monolithic safety glass. The insertion of open-mesh stainless steel or woven polyester interlayers produces local thickness variation from 0.1 mm to 0.8 mm, which prevents uniform vacuum consolidation when a single-step vacuum release is used. Production lines for decorative panels therefore insert a 15–20 min plateau at 85–90 °C under -0.90 bar gauge vacuum before the cure ramp; this permits resin flow into mesh openings without generating bubble clusters at wire intersections. The interlayer thickness specification for this segment is commonly 0.76 mm or 1.14 mm on each side of the insert. Optical haze must be measured by ASTM D1003-21 on a clear glass sandwich with the insert in place; haze above 12 % is usually rejected for point-of-sale display glazing. Terminal products are decorative glass partitions, elevator cab panels, and retail display units where the interlayer serves as both adhesive and carrier for the insert. Absence of visible flow lines is governed by the visual quality clauses of EN ISO 12543-2:2021, but insert-specific aesthetic acceptance remains contractual rather than fully standardized.
In coastal or riverine lamination facilities, the principal bottleneck is interlayer moisture uptake before the vacuum cycle. EVA-based interlayers stored at 60–70 % RH absorb enough water to generate micro-voids at the glass interface when cure temperature exceeds the local boiling point; the defect appears as a white haze concentrated within 50 mm of the edge. The standard countermeasure is pre-drying in a recirculating air cabinet at 40–45 °C for 6–12 h when storage RH has exceeded 60 % for more than 24 h. Pre-drying must be verified by moisture analyzer to below 0.1 wt% before layup. The layup ratio remains a single 0.76 mm interlayer between two glass plies, but the process window narrows because no thermal cycle can remove delamination voids once cured.
For low-speed electric vehicle platforms and agricultural glazing, an EVA-based interlayer is evaluated only after full type approval because UN ECE R43 does not grant automatic equivalence to PVB interlayers. The same vacuum-bag process used in flat architectural glass cannot produce a curved windshield geometry; automotive laminates require matched metal molds and an autoclave profile with pressure above 1.0 MPa and temperature above 140 °C. A typical flat side-lite configuration uses a 0.76 mm interlayer combined with 2.5 mm glass, giving a film-to-glass thickness ratio near 1:3. Edge creep and thickness thinning are controlled by die-cut tolerance of ±2 mm and by holding autoclave pressure until glass cools below 50 °C. In the absence of EVA-specific homologation data for the exact glass curvature and windshield swept area, the finished glazing must be submitted to full optical, fragmentation, and mechanical testing under UN ECE R43, including the headform test where applicable. Published data for this specific configuration is limited; the interlayer is not recommended for primary windshield substitution without a complete homologation program. Terminal products are restricted to non-windshield glazing for low-speed vehicles, cab guards, and agricultural rear windows where local approval permits EVA interlayers.
Double-glass building-integrated photovoltaic modules use two sheets of tempered glass with the interlayer running edge-to-edge, which shifts the dominant failure mode from backsheet delamination to edge seal creep and busbar corrosion. A conventional BIPV layup uses 2.5 mm glass / 0.76 mm interlayer / 2.5 mm glass; thicker 1.14 mm interlayers are specified where structural edge capacity is required. The lamination program is closer to architectural glass than to backsheet modules: a vacuum-bag or autoclave cycle at 135–145 °C for 45–60 min is followed by a post-cure annealing step because residual peroxide decomposition and post-cure shrinkage of 0.5–1.0 % can bow the panel edge if removed hot. Deflection is measured on the finished panel against a flat reference; deviation above 2 mm/m from flatness is typically rejected by facade contractors. Compliance is split between photovoltaic reliability and construction product regulation: the module must meet IEC 61215-1:2021 damp heat and thermal cycling, while the facade installation must follow EN 50583-1:2016 and the fire reaction class is determined under EN 13501-1. The terminal product is a BIPV facade panel with no rear air cavity, where the interlayer must maintain edge adhesion at service temperatures up to 90 °C and down to -40 °C without shear creep exceeding 1 mm in the edge zone.
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EVERLAM COOL is a reduced-temperature ethylene-vinyl acetate (EVA) interlayer formulated for laminated safety glass assemblies in which the lamination cycle must remain below the thermal stability limit of embedded functional layers. The product is supplied as COOL 038, COOL 076, and COOL 152; the numeric suffix denotes nominal film thicknesses of 0.38 mm, 0.76 mm, and 1.52 mm. Standard roll widths are 2,450 mm and 3,210 mm, with slit coils down to 150 mm for stepped-unit and fin-glazing work. The base resin is a vinyl acetate copolymer with vinyl acetate content in the 28–33 wt% range. Melt flow index measured according to ISO 1133-1:2022 at 190 °C under 2.16 kg is typically 20–40 g/10 min; the higher flow relative to conventional architectural EVA allows wet-out of glass and heat-sensitive films at lower temperature. Manufacturer-published process guidance places the soak plateau at 120–135 °C, while standard EVA grades commonly require 140–155 °C for adhesion build-up. The material is manufactured on a 48:1 L/D co-rotating twin-screw compounding line with side-fed silane masterbatch and calendered on chill rolls at 8–12 °C to control crystallinity and blocking. The reduced thermal load is intended for laminates containing digitally printed polyethylene terephthalate, polycarbonate functional layers, natural-fibre textiles, and photovoltaic cells with limited short-term heat tolerance.
The lower practical boundary is governed by silane condensation kinetics and peroxide decomposition rate. Below 115 °C, gel content development slows sharply; solvent extraction according to ASTM D2765-16 on 0.76 mm films laminated at 115 °C for 10 min has shown gel content below 70%, while a 125 °C soak for 10–15 min produces 75–85%. The crosslinking package is designed to retain sufficient unreacted silane at the glass interface for adhesion, but the temperature safety margin is narrower than that of high-temperature EVA. Production-scale vacuum-bag laminators with heated platen zones of 2,400 mm width require platen offset no greater than ±2 K to avoid edge haze; a 24-zone laminator with a 2.2 m x 3.6 m bed produced batch-to-batch haze variation from 1.4% to <0.8% after replacement of a fatigued silicone membrane. The pressure ramp should not exceed 0.8 bar/min during the initial 3–5 min vacuum phase. If pressure is applied before air removal, the softened interlayer seals against the glass perimeter and traps air, which appears as millimetre-scale bubbles at the edge. For 1.52 mm films, melt strength at 125 °C is lower than standard EVA, and unsupported sag can create thickness variation exceeding ±0.05 mm when the laminator bed is not level within 0.5%. Post-cure dynamic mechanical analysis per ISO 6721-6 at 1 Hz and 30 °C shows storage modulus in the range of 8–14 MPa and a tan δ peak between −15 °C and −5 °C; the elevated-temperature modulus is lower than PVB and should be checked for horizontal or overhead glazing deflection.
Optical quality after lamination depends on moisture control and surface cleanliness. A clear 6 mm soda-lime glass / 0.76 mm interlayer / 6 mm soda-lime glass build-up typically shows total light transmittance of ≥90% per EN 410:2011 and haze below 1.0% per ISO 14782:2021 when film is conditioned at 25 °C and 50% RH for 24 h before assembly. Amine-based glass cleaners or silane primers containing high-pH solvents can accelerate alkoxysilane condensation and generate local microscatter; neutral pH cleaning systems are used on lines where edge pinching and haze have been traced to contaminated float glass. Accelerated weathering under ISO 4892-2:2013 for 3,000 h with UVA-340 lamps on 2 mm clear glass has produced a yellowness index increase of less than 2 units in manufacturer technical literature; published data for this specific configuration is limited, and project-specific solar exposure regimes above 5 kWh/m²/day should be confirmed by xenon-arc testing.
Conventional PVB interlayers typically require autoclave conditions near 135–150 °C and 12–14 bar to reach acceptable edge clarity and impact adhesion. EVERLAM COOL is formulated for vacuum-bag or oil-heated platen presses at 120–135 °C, which can eliminate autoclave bottlenecks on architectural lines. Impact performance of laminated glass containing a 1.52 mm interlayer can be tested according to EN 12600; classification 2B2 is commonly reported for standard clear annealed float glass, but the final class depends on glass type, thickness, spacer geometry, and edge bite. Under ANSI Z97.1, laminates with 1.52 mm interlayers are routinely assessed for safety-glazing compliance; monolithic glass is not. The material is not an ionomer structural interlayer and should not be treated as a direct substitute for high-modulus ionomer grades in point-fixed glass fins or blast-resistant glazing without a design verification per EN 16612. At 50 °C the storage modulus of EVERLAM COOL is lower than that of PVB, and horizontal glazing deflection must be calculated rather than extrapolated from PVB design tables. The product has lower equilibrium moisture uptake than PVB; EVA film conditioned at 50% RH and 23 °C for 24 h typically retains <0.1 wt% moisture, whereas PVB requires storage at 0.4–0.6 wt% to prevent bubble formation and uncontrolled pummel adhesion. This reduces the need for controlled-environment storage but does not remove the requirement to pre-dry film when relative humidity exceeds 60%.
Because EVA chemistry releases trace acetic acid during thermal lamination and long-term weathering, direct contact with unsealed copper, zinc, or low-grade galvanised steel edge spacers should be avoided; stainless steel or anodised aluminium edge components are preferred. Pre-drying at 50–60 °C for 4 h is required when storage relative humidity exceeds 60%. The product is incompatible with amine-based silane additives and high-pH cleaning agents because these promote premature alkoxysilane condensation and optical haze. For polycarbonate-containing stacks, residual moisture must be below 0.05 wt% before lamination to avoid bubble formation at 125 °C. Processors should also avoid fluoropolymer release liners with acid-scavenging fillers, which can compete with the glass surface for silane adhesion.
Representative values are compiled from manufacturer technical bulletins and standard test methods. The comparative table is a specification screening tool, not a substitute for qualification trials on the actual laminating line and glass configuration.
| Property | EVERLAM COOL | Conventional EVA | PVB |
|---|---|---|---|
| Nominal thickness range | 0.38–1.52 mm | 0.38–1.52 mm | 0.38–1.52 mm |
| Lamination soak temperature | 120–135 °C | 140–155 °C | 135–150 °C autoclave |
| Melt flow index per ISO 1133-1:2022 | 20–40 g/10 min | 10–25 g/10 min | not applicable |
| Light transmittance per EN 410:2011 | ≥90% | ≥90% | ≥89% |
| Haze per ISO 14782:2021 | <1.0% | <1.2% | <1.0% |
| Adhesion to glass per ASTM D903-98(2010) | 35–55 N/25 mm | 40–60 N/25 mm | pummel adhesion ≥5 |
| Typical gel content after lamination per ASTM D2765-16 | 75–85% | 80–90% | not applicable |
| Standard | Test or Requirement | Application Condition |
|---|---|---|
| EN ISO 12543-2:2011 | Durability of laminated glass interlayer | Temperature, humidity, and radiation exposure |
| EN 12600 | Pendulum impact classification 2B2 | Safety glazing in buildings |
| ANSI Z97.1 | Safety glazing impact | North American façade and door units |
| EN 410:2011 | Light transmittance and solar properties | Spectrophotometric measurement |
| ASTM D638-14 | Tensile strength and elongation of film | Type IV specimen, 50 mm/min |
| ISO 4892-2:2013 | Artificial weathering | UVA-340 or xenon lamp, 3,000 h |
| ISO 14782:2021 | Haze | Inline hazemeter on laminated sample |
Across current architectural and photovoltaic lines, the reduced-temperature plateau is used for spandrel panels with printed PET interlayers, building-integrated photovoltaic modules, and acoustic laminates combining EVA with polycarbonate or polymethyl methacrylate layers. In photovoltaic lamination, line operators have associated the 120–135 °C plateau with lower backsheet shrinkage when polyvinyl fluoride/polyester backsheets are used; corner lift has been observed when lamination temperature exceeds 135 °C and backsheet shrinkage measured by thermal mechanical analysis is above 1.5% at 150 °C. For acoustic laminated glass, the lower processing temperature permits use of polymeric interlayer combinations that would otherwise relax or oxidise above 140 °C; acoustic performance is then verified by ISO 10140-2. Usage in overhead glazing requires a project-specific structural calculation because the interlayer is not a structural PVB or ionomer replacement.
