| HS Code | 354366 |
| Product Name | EVOH EVAL SP292B |
| Polymer Type | Ethylene Vinyl Alcohol Copolymer (EVOH) |
| Ethylene Content | 29 mol% |
| Density | 1.19 g/cm³ |
| Melt Flow Rate | 2.9 g/10 min (190°C, 2.16 kg) |
| Melting Point | 190°C |
| Glass Transition Temperature | 62°C |
| Crystallization Temperature | 160°C |
| Oxygen Transmission Rate | 0.2 cm³·20µm/m²·day·atm (20°C, 65% RH) |
| Tensile Strength | 80 MPa at break |
| Elongation At Break | 10% |
| Water Vapor Transmission Rate | 30 g·20µm/m²·day (40°C, 90% RH) |
As an accredited EVOH EVAL SP292B factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Packaged in 25 kg sealed, moisture-proof polyethylene-lined bags, labeled with product name, batch number, and handling precautions. |
| Container Loading (20′ FCL) | 20′ FCL container loading of EVOH EVAL SP292B requires secure palletization, proper dunnage, and safe handling to prevent damage during transit. |
| Shipping | EVOH EVAL SP292B ships as moisture-sensitive resin pellets in sealed, dry containers. Avoid high humidity and direct sunlight. Standard non-hazardous transport by truck, rail, or sea is acceptable; protect from puncture and condensation. Maintain dry, ventilated conditions during transit and storage. |
| Storage | Store EVOH EVAL SP292B in a cool, dry, well-ventilated area away from direct sunlight, heat, and ignition sources. Keep the original container tightly sealed to prevent moisture absorption and contamination. Avoid contact with oxidizing agents. Maintain storage temperature below 30°C and use within the manufacturer’s recommended shelf life. |
| Shelf Life | Shelf life is typically 2 years from production date when stored unopened in a cool, dry place. |
Cast coextrusion of seven- and nine-layer barrier webs for modified atmosphere packaging of cooked meat and cheese positions EVOH EVAL SP292B in the core, isolated from water-bearing skin layers by maleic anhydride grafted polyethylene or polypropylene tie resins. On production equipment with die widths of 1,800–3,000 mm, chill roll diameters of 800–1,000 mm, and line speeds of 150–250 m/min, the barrier layer is maintained at 5–8% of total film thickness, typically 2.5–4.0 µm in a 50–70 µm web, with tie layers of 2–3 µm per side. Food contact status is covered under FDA 21 CFR 177.1360 for ethylene-vinyl alcohol copolymers and Commission Regulation (EU) No 10/2011; overall migration is tested per EN 1186-1:2002 with results below 10 mg/dm². The EVOH is pre-dried in a desiccant hopper at 80°C for 4–6 h to below 0.1% moisture before entering a single-screw extruder with L/D 24:1–30:1; barrel temperatures are profiled from 180°C to 225°C, and melt temperatures are held at 210–230°C at the die. At melt temperatures above 240°C, gel formation and black specks appear due to thermal degradation of the EVOH backbone. Oxygen transmission rate for the full structure measured under ASTM D3985 at 23°C, 0% RH is typically below 0.5 cm³/(m²·day·atm) but rises by an order of magnitude at 85% RH, which limits shelf-life claims for high-moisture products unless the EVOH is buried between polyolefin skins with sufficient tie layer coverage. Terminal webs become thermoformed modified atmosphere packaging bottom webs, lidding films, and vacuum skin packs for sliced cheese, processed meats, and fresh pasta.
The production of retortable PP/EVOH sheet begins with a five-layer coextrusion line in which EVAL SP292B is placed between two tie layers and outer polypropylene cap layers. The EVOH layer is held at 4–7% of total sheet thickness, with tie layers at 3–5% each; finished sheet thickness ranges from 0.8–2.0 mm. Compliance for retortable food contact under FDA 21 CFR 177.1360 and Commission Regulation (EU) No 10/2011 includes migration testing after high-temperature exposure, often at 121°C for 30 min using food simulants simulating fatty and aqueous products. Coextrusion is performed on a single-screw line with barrier screw geometry and extrusion temperatures of 200–230°C; the sheet is cooled on a three-roll stack with roll temperatures set at 20–40°C. Thermoforming is carried out on plug-assisted equipment with mold temperatures of 120–140°C to limit crazing at the EVOH layer. Retort processing introduces saturated steam into the polypropylene outer layers; at 121°C the EVOH layer can plasticise, reduce crystallinity, and increase oxygen permeability. Published production data show oxygen transmission rate can shift from less than 0.3 cm³/(m²·day·atm) before retort to 1.0–2.5 cm³/(m²·day·atm) post-retort unless the EVOH layer is protected by thick polypropylene cap layers and slow cooling restores crystallinity. Delamination and edge thinning occur when die temperature deviation exceeds ±5°C from the set point. Terminal produced parts are retortable cups, bowls, and trays for wet pet food, ready meals, and sauces.
Blow moulded fuel tanks and filler pipes use a six-layer wall construction: high density polyethylene cap layer, regrind layer, maleic anhydride grafted polyethylene tie layer, EVAL SP292B barrier layer, second tie layer, and high density polyethylene inner layer. The EVOH layer is typically 2–3% of total wall thickness, tie layers 3–4% each, and the regrind layer can incorporate up to 35–50% post-industrial trim, including dispersed EVOH domains. Permeation compliance is tested under EPA 40 CFR 86.1813-17 and CARB LEV III evaporative emission procedures; barrier performance is assessed by SAE J1737 for hydrocarbon permeation. Coextrusion blow moulding with six extruders feeding a multilayer head is conducted at melt temperatures of 200–220°C for EVOH and 190–230°C for high density polyethylene; parison programming and wall thickness distribution are controlled by servo-hydraulic die gap adjustment. Because EVOH has higher melt viscosity than high density polyethylene at these temperatures, interfacial instability can occur if the EVOH layer falls below 1.5% or if head temperature deviation exceeds ±5°C. Post-moulding flash is trimmed and reground; EVOH dispersion in regrind can raise moisture adsorption of the high density polyethylene matrix, so regrind is dried at 80–90°C for 3–4 h before reintroduction. Finished tanks must meet hydrostatic and drop impact requirements under UN/ECE R34 and are supplied as automotive fuel tanks, filler pipes, and carbon canister housings for gasoline and ethanol blends.
Thermoformed pharmaceutical blister webs for moisture-sensitive oral solid dose products coextrude EVAL SP292B as a middle layer in PVC/EVOH/PVDC or polypropylene/EVOH/polyethylene structures. The barrier layer is supplied at 5–12% of total web thickness, typically 10–30 µm in a 250–500 µm base web; tie layers or direct adhesion layers account for 3–5% each. Drug packaging compliance is verified under USP 671 for container moisture permeability, Ph. Eur. 3.2.2 for plastic containers, and FDA 21 CFR 177.1360 for food and drug contact use; extractables testing follows ISO 10993-18 when required for medical packaging. The coextruded sheet is produced on flat die lines with barrier screw geometry, melt temperatures of 205–225°C, and polished roll cooling at 30–50°C. Thermoforming of unit-dose cavities is done on rotary or platen machines with forming temperatures of 110–150°C depending on the base resin; EVOH layers in cavity corners can thin by 30–50%, and this localised thinning determines minimum barrier performance. Water vapour transmission rate tests per ASTM F1249 at 38°C, 90% RH for a 250 µm structure with an EVOH layer often fall below 0.05 g/(m²·day), but actual values vary with cavity depth, corner radius, and base resin selection. Terminal converted parts are unit-dose blisters for hygroscopic tablets, effervescent formulations, and desiccant-containing packs.
When polyolefin tube bodies replace laminated aluminium foil or PVDC coatings for toothpaste and cosmetic creams, EVAL SP292B is introduced as a coextruded middle layer between maleic anhydride grafted polyethylene tie layers and linear low density polyethylene skin layers. The EVOH layer is kept at 5–8% of total tube wall thickness, with total wall thickness after side-seam welding typically 250–400 µm. Compliance for cosmetic packaging is evaluated under EU Regulation (EC) No 1223/2009 for packaging interactions and FDA 21 CFR 177.1360 where the tube may contact oral care products; organoleptic and gas chromatography methods are used to assess flavour and fragrance retention after accelerated storage at 40°C for 12 weeks. Tube bodies are produced by spiral or straight coextrusion of a five-layer sleeve, followed by butt-welding of the side seam using hot air or ultrasonic welding. The EVOH layer requires melt temperatures of 210–225°C; shoulder injection moulding with polypropylene or high density polyethylene is performed at 180–220°C. A known production limitation is stress cracking at the shoulder junction when the EVOH layer is not fully encapsulated by tie layers; extrusion tooling must maintain concentric layer distribution within ±10% to prevent localised oxygen ingress at the seam weld. Terminal products are toothpaste tubes, barrier cosmetic cream tubes, and hair colourant tubes.
Agricultural films for soil fumigation and controlled atmosphere storage use EVAL SP292B in five-layer blown film with linear low density polyethylene outer layers and maleic anhydride grafted polyethylene tie layers. The barrier layer represents 3–6% of total film thickness; for a 40–60 µm film, this corresponds to 1.5–3.0 µm. Oxygen permeability is measured under ASTM D3985 at 23°C, 0% RH, and water vapour transmission under ASTM F1249. Compliance for fumigation films is tied to soil fumigant label requirements and product stewardship programs under US EPA; published data for this specific configuration is limited, and performance validation is typically performed on farm-scale trials with gas concentration monitoring using photoacoustic sensors. The film is blown on high-stalk extrusion lines with die diameters of 250–600 mm, blow-up ratios of 2.0–3.5, and melt temperatures of 200–220°C. Bubble stability around the EVOH layer is sensitive to frost-line height; frost-line temperature below 15°C can reduce interlayer adhesion. After film burial, soil moisture at the outer polyethylene surface can plasticise the EVOH layer through the tie layer, raising oxygen transmission rate; coextruded structures with thicker outer layers of 20–30 µm slow this moisture ingress. Terminal products are soil fumigation tarps, silage clamp covers, and controlled atmosphere storage liners.
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EVAL SP292B is an ethylene-vinyl alcohol copolymer supplied by Kuraray for barrier-layer use in coextruded packaging and industrial structures. The manufacturer’s published typical data list an ethylene content of 32 mol%, a melt flow rate of 2.0 g/10 min at 190 °C under 2.16 kg load when determined to ISO 1133-1:2022, and a density of 1.19 g/cm³ when determined to ASTM D1505-20. The copolymer is intended for high-oxygen-barrier sheet, thermoformed trays, tubes, and blow-moulded containers in which oxygen ingress must be controlled. In dry-state testing, a 20 µm monolayer film shows an oxygen transmission rate near 0.4 cm³/(m²·day·atm) at 20 °C and 0 % RH when measured to ASTM D3985-17. That value is not a fixed service property; oxygen permeability rises sharply as the surrounding relative humidity increases and water molecules disrupt interchain hydrogen bonding in the vinyl alcohol segments. The grade occupies a mid-range barrier position: lower in oxygen transmission than higher-ethylene EVOH grades at dry conditions, but more moisture-sensitive than grades with ethylene contents above 38 mol%.
The primary differentiators are molar ethylene content, melt flow rate, and the resulting rheological behaviour in multilayer tooling. Higher ethylene content lowers absolute oxygen barrier but improves resistance to humidity-induced barrier loss and flexural cracking; lower ethylene content raises dry oxygen barrier but increases moisture sensitivity. EVAL SP292B at 32 mol% ethylene is positioned between high-barrier film grades and higher-ethylene moisture-resistant grades. Its melt flow rate of 2.0 g/10 min places it in a viscosity window suitable for sheet and profile coextrusion where the EVOH layer must remain continuous at thicknesses from 5 to 15 µm. Compared with H171B at 38 mol% ethylene, EVAL SP292B provides a higher dry oxygen barrier, but the H171B grade may exhibit lower relative barrier loss under sustained high-humidity conditions. Published data for direct comparison between SP292B and standard film-extrusion grades in deep-draw thermoforming are limited; grade-specific selection therefore relies on manufacturer technical bulletins and pilot-line layer-distribution studies.
| Property | Typical value | Test method |
|---|---|---|
| Ethylene content | 32 mol% | Manufacturer data |
| Melt flow rate | 2.0 g/10 min at 190 °C, 2.16 kg | ISO 1133-1:2022 |
| Density | 1.19 g/cm³ | ASTM D1505-20 |
| Melting point | 183 °C | ASTM D3418-15 |
| Glass transition temperature | 61 °C | Manufacturer data |
| Oxygen transmission rate, 20 µm film | 0.4 cm³/(m²·day·atm) at 20 °C, 0 % RH | ASTM D3985-17 |
Processing of EVAL SP292B requires a narrow thermal window. The manufacturer specifies an extruder barrel temperature profile from 180 °C in the feed zone to 220–230 °C at the metering section, with melt temperature not exceeding 240 °C. Exceeding 240 °C accelerates vinyl alcohol dehydration, produces gel particles, and may generate acetic acid by-products. Screw configurations with an L/D ratio between 24:1 and 30:1 and a compression ratio of 3:1 to 4:1 are used; high-shear mixing sections should be minimised because viscous heating can raise the melt above setpoint. General-purpose polyolefin screws with Maddock or pineapple mixing elements are unsuitable. When such elements are present, screw speed should be reduced and barrel temperatures kept at the lower end of the range. Measured melt pressure at the die is typically maintained below 250 bar to reduce shear heating. On production-scale coextrusion lines, satellite extruders with 45 mm screw diameter and 24:1 L/D ratio are used for EVOH barrier layers at output rates between 10 and 30 kg/h, depending on die width and layer thickness.
Thermal degradation of EVAL SP292B proceeds through chain scission of vinyl alcohol sequences and acid-catalysed dehydration to conjugated polyenes. At melt temperatures above 240 °C, the reaction rate increases sharply; acetic acid is liberated, and viscosity first falls then rises as crosslinking dominates. The processing window is therefore defined not only by setpoint temperature but also by thermal history and residence time. Typical melt residence time should remain below 10 min. Start-up with EVOH should use a low-viscosity polyolefin purge. Prolonged hold periods require barrel cool-down to below 180 °C; failure to cool can produce black specks and gel fish-eyes in subsequent runs. These failure modes are observed in industrial coextrusion when hot spots form in screw valleys or when screw speed is increased without reducing heater setpoints.
| Parameter | Recommended range | Condition or unit |
|---|---|---|
| Drying temperature | 80–100 °C | Desiccant bed, dew point below −40 °C |
| Drying time | 6–12 h | Cold-start hopper |
| Residual moisture after drying | below 0.3 wt%, preferably below 0.1 wt% | High-sensitivity deep-draw sheet |
| Extruder barrel profile | 180–230 °C | Feed to metering |
| Melt temperature | 220–230 °C | Not above 240 °C |
| Screw L/D ratio | 24:1–30:1 | Gradual transition |
| Compression ratio | 3:1–4:1 | No high-shear mixing element |
| EVOH layer thickness | 5–15 µm | Barrier packaging |
| Tie layer thickness | 2–10 µm | Maleic anhydride-grafted polyolefin |
| Die temperature | 220–230 °C | Encapsulated EVOH |
| Melt pressure at die | below 250 bar | Shear control |
| Thermoforming sheet surface temperature | 120–160 °C | Deep-draw forming |
Because EVAL SP292B is hygroscopic, moisture uptake before processing degrades melt stability and generates surface defects. The resin should be dried to below 0.3 wt% moisture, and preferably below 0.1 wt% for sensitive deep-draw thermoforming. Desiccant-bed dryers with a dew point below −40 °C and inlet air temperature between 80 and 100 °C are required; drying times of 6 to 12 h are common for cold-start hoppers. Dried pellets should not remain exposed to ambient air for more than 15 min before entering the extruder throat. Processing material above 0.3 wt% moisture may reduce apparent melt viscosity and produce bubbles, pinholes, and layer breaks in thin coextruded layers below 10 µm.
In coextrusion, EVAL SP292B is not used as a monolayer in commercial food packaging; it is embedded between polyolefin skins and maleic anhydride-grafted tie resins. The tie layers are typically between 2 and 10 µm thick. A continuous tie layer is necessary because ethylene-vinyl alcohol copolymer has poor adhesion to polyethylene and polypropylene. Interfacial instability appears when the EVOH layer viscosity is too far from that of adjacent polyolefin layers. For EVAL SP292B, the activation energy of viscous flow is high, and melt viscosity falls rapidly as temperature increases. Coextrusion feedblock and die temperature are therefore held above 220 °C to lower EVOH viscosity, but not above 230 °C for the residence time used. Layer encapsulation of the EVOH by tie resin should be completed before the final die land to avoid contact between molten EVOH and metal surfaces, which can promote oxidative degradation. The final oxygen transmission rate of the multilayer structure is measured according to ASTM D3985-17; a structure with 10 µm EVAL SP292B and polyolefin skins at 50 µm total thickness commonly falls below 1.0 cm³/(m²·day·atm) at 20 °C, 65 % RH. At 85 % RH, the value may exceed 3.0 cm³/(m²·day·atm), depending on the moisture-barrier quality of the skin layers.
Thermoformed tray production begins with dried EVAL SP292B pellets processed into multilayer sheet on flat-die lines. The sheet is then heated to 120–160 °C surface temperature before forming. The EVOH layer is not a structural layer; its thinning behaviour during plug-assisted forming determines local oxygen barrier. Thinning to below 5 µm at tray corners reduces barrier proportionally, so plug design and sheet orientation are adjusted to maintain the EVOH layer above 5 µm in sidewall positions. Wall-thickness distribution after forming is measured by microtome cross-section; oxygen transmission rate after forming may be tested at 23 °C and 50 % RH per ASTM D3985-17. Published data for EVAL SP292B in specific high-draw tray designs are limited, but the manufacturer describes the grade as a high-melt-strength material intended for deep-draw sheet.
During retort exposure at 121 °C for 30 min, moisture absorbed into the EVOH layer raises oxygen transmission rate by up to one order of magnitude. Upon storage at 20 °C and 50 % RH, barrier recovery occurs over hours to days as moisture desorbs from the outer layers; recovery time depends on the skin thickness and polymer composition. This behaviour limits the use of EVAL SP292B in retort applications where the package is filled immediately after sterilisation and must maintain low oxygen ingress within minutes. For such applications, a higher-ethylene EVOH grade or a thicker moisture-barrier skin may be required. Oxygen transmission rate measurements made immediately after retort should be compared with steady-state values after moisture equilibration; otherwise shelf-life calculations will understate oxygen ingress. The moisture sensitivity also imposes an upper practical humidity limit: at relative humidities above 85 % RH, the oxygen barrier of EVAL SP292B can drop sufficiently that additional oxygen scavengers or aluminium foil layers are needed for sensitive products.
Regulatory status for EVAL SP292B must be confirmed grade-specific, but ethylene-vinyl alcohol copolymers are frequently evaluated under food-contact provisions such as FDA 21 CFR 177.1360 and EU Regulation 10/2011. Compliance verification should cover migration limits for ethylene and vinyl acetate oligomers. REACH and RoHS status should be checked against current supplier declarations. The grade is not inherently a moisture-barrier resin; it requires coextruded polyolefin skins to maintain its oxygen barrier under humid conditions. Processing, regulatory, and barrier-performance limits should be integrated into packaging design rather than treated as isolated specifications.
