EVA IBM · FLEXIBLE VA COPOLYMER · SOFT SQUEEZE · KOREA EVER-POWER ZQ SERIES
EVA (ethylene vinyl acetate) copolymer IBM produces flexible, soft-touch containers in the 5-50% vinyl acetate range — softer and more elastic than LDPE at equivalent wall thickness, with excellent low-temperature flexibility and superior gloss compared to polyolefin IBM. Korea Ever-Power ZQ40 and ZQ60 produce EVA IBM containers for cosmetic squeeze applications, soft-touch pharmaceutical dispensers and flexible medical grade containers requiring EVA’s distinctive compliance and clarity properties.
KOREA EVER-POWER · ANSAN-SI, GYEONGGI-DO · JULY 2026
PROCESS REFERENCE · EVA IBM KEY PARAMETERS
VA CONTENT
5-50%
Vinyl acetate content determines EVA IBM flexibility — 5% VA: LDPE-like; 18-28% VA: soft cosmetic squeeze; 40-50% VA: very soft medical grade
BARREL TEMP
140-180°C
EVA processes at lower barrel temperature than LDPE (170-200°C) — VA groups lower EVA crystallinity and melting point
FLEXIBILITY
Softest IBM
EVA 18-28% VA flexural modulus 40-120 MPa — softer than LDPE (200-400 MPa) for Korean soft-touch cosmetic squeeze applications
KEY APPLICATION
Cosmetic Squeeze
Korean soft-touch lotion/gel squeeze bottle 50-200 ml — EVA IBM for premium tactile feel at Korean K-beauty brand specifications
SECTION 01
EVA copolymer IBM occupies the flexibility zone between LDPE IBM (soft) and elastomeric IBM (very soft) — covering Korean cosmetic soft-touch squeeze containers, flexible pharmaceutical dispensers and low-temperature-flexible medical containers that require a material softer than LDPE at Korean ambient and sub-zero conditions.
| VA CONTENT | FLEX MOD (MPa) | CLARITY | BARREL °C | APPLICATION |
|---|---|---|---|---|
| EVA 5-9% VA | 150-250 MPa | Similar to LDPE | 160-185°C | Slight LDPE upgrade: better cold-temp flexibility, Korean flexible packaging |
| EVA 18-28% VA ★ | 40-120 MPa | Translucent-clear | 140-165°C | Korean cosmetic soft-touch squeeze IBM — body gel, tanning gel, K-beauty travel squeeze |
| EVA 40-50% VA | 10-30 MPa | Near clear | 130-155°C | Korean medical soft-squeeze, Korean IV bag soft container, Korean contact lens solution |
SECTION 02
EVA 18-28% VA vs LDPE IBM AT 0.6mm WALL, 100ml SQUEEZE BOTTLE
| PROPERTY | EVA 18-28% VA | LDPE |
|---|---|---|
| Flexural modulus | 40-120 MPa | 200-400 MPa |
| Wall haze (0.6mm) | 3-8% (near-clear) | 15-25% |
| Barrel temperature | 140-165°C | 170-200°C |
| Low-temp flexibility (-20°C) | Excellent (no embrittlement) | Good (slight stiffening) |
| Primary squeeze application | Korean cosmetic soft-touch | Korean pharmaceutical |
SECTION 03
EVA IBM PARAMETERS — 50ml COSMETIC SQUEEZE BOTTLE @ ZQ40, EVA 18-28% VA
Pre-Drying
None required
EVA is not hygroscopic — no pre-drying needed before IBM barrel loading. Lower VA content grades may benefit from brief 60°C/2 h drying in humid Korean summer conditions above 85% RH.
Barrel Temperature
140-165°C (18-28% VA)
EVA lower barrel temp than LDPE. Critical upper limit: above 180°C EVA begins deacetylation releasing acetic acid — smell and container yellowing. Monitor for acetic acid odour as barrel overtemp indicator.
Mould Temperature
5-12°C
Cold mould for rapid EVA solidification. EVA at 18-28% VA solidifies at 40-55°C — requires colder mould than LDPE for adequate cycle time. Mould chiller at 6-10°C.
Cycle Time
3.5-4.2 s (50 ml)
EVA faster than LDPE at same format — lower barrel injection pressure needed (EVA lower melt viscosity) and cold mould enables rapid stripping cycle.
EVA thermal stability caution — acetic acid release: EVA above 180°C undergoes deacetylation: the vinyl acetate side groups release acetic acid (CH3COOH) as vapour. This produces a distinctive vinegar-like odour in the IBM production area and causes progressive yellowing of EVA containers as acetic acid reacts with EVA chain fragments. Monitor the IBM production area for acetic acid odour at EVA IBM startup — any detectable acetic acid smell requires immediate barrel temperature reduction. Acetic acid corrosion can damage IBM barrel and nozzle components at sustained EVA overtemperature conditions.
SECTION 04
Korean Body Gel and Tanning Squeeze
EVA 18-28% VA IBM at 100-200 ml for Korean K-beauty body gel, Korean self-tanning gel and Korean gradual tanning lotion. The soft-touch EVA squeeze at 100-200 ml allows Korean consumers to dispense body gel with one-hand palm squeeze — without the firmer squeeze force LDPE requires at the same wall. EVA 3-8% wall haze allows the tanning gel’s amber or brown colour to show through the container, reinforcing the Korean K-beauty product naturalness and efficacy transparency signal. VA 18-28% formulation compatibility: check tanning actives (DHA dihydroxyacetone) at 3-8% for EVA interaction at 40°C/90-day accelerated storage.
Korean Sunscreen Squeeze Bottle
Korean sunscreen (Korean SPF 50+ PA++++ formulation) in EVA 18-28% VA IBM squeeze bottles at 50-100 ml. For comparison with Korean lotion pump bottle IBM in HDPE and PP, the lotion pump bottle IBM guide covers pump neck standards. Korean sunscreen’s high TiO2 and zinc oxide loading (3-10%) is chemically inert toward EVA polymer — no EVA-sunscreen interaction. EVA low temperature flexibility is the specific advantage for Korean winter or Korean ski resort sunscreen application: LDPE becomes slightly stiff below -10°C at standard wall thickness; EVA 18-28% VA remains compliant and easy to squeeze at -20°C, important for Korean outdoor K-beauty cosmetic brands targeting Korean winter sports or Korean ski resort retail.
Korean Travel-Size Soft Squeeze
EVA 18-28% VA IBM at 10-50 ml for Korean K-beauty travel kit soft squeeze containers. Korean travel cosmetic packaging brands increasingly specify EVA IBM over LDPE IBM for Korean luxury travel kit squeeze bottles because EVA’s near-clear transparency (3-8% haze) at 10-50 ml formats allows Korean travel retail display of the product colour through the container — creating premium shelf presence at Korean airport duty-free and Korean boutique travel retail that LDPE’s 15-25% haze does not achieve.
SECTION 05
EVA 40-50% VA Medical Grade
EVA 40-50% VA IBM at 5-50 ml for Korean medical soft squeeze containers and Korean pharmaceutical flexible dispensers. EVA 40-50% VA at 0.6 mm wall has a flexural modulus of 10-30 MPa — approaching silicone rubber compliance, suitable for Korean medical applications requiring very low squeeze force for elderly Korean patients or Korean paediatric pharmaceutical compliance dispensers. Korean MFDS medical device EVA container: EVA 40-50% VA must meet Korean Ministry of Food and Drug Safety ISO 10993 biocompatibility (cytotoxicity, sensitisation, irritation) for Korean Class I and II medical device contact materials. Korea Ever-Power maintains ISO 10993 EVA qualification documentation for medical EVA IBM production.
Korean Contact Lens Solution EVA IBM
EVA 18-28% VA IBM at 50-120 ml for Korean contact lens saline solution squeeze containers. EVA IBM advantages over LDPE IBM for Korean contact lens solution: lower haze (EVA 3-8% vs LDPE 15-25%) allows Korean consumers to see the saline solution level through the container; EVA lower VA content grades pass Korean MFDS ophthalmic-adjacent contact solution chemical resistance requirements. Korean contact lens solution EVA IBM: verify benzalkonium chloride (BAK) 0.001-0.004% preservative adsorption on EVA surface — BAK adsorption on EVA is lower than on LDPE due to EVA’s polar vinyl acetate groups reducing the BAK-polymer hydrophobic interaction.
SECTION 06
| ZQ MODEL | 5-50 ml ★ (cav/hr) | 50-120 ml (cav/hr) | 150-200 ml (cav/hr) | PROFILE |
|---|---|---|---|---|
| EP-ZQ40 ★ | 9-11 / ~23,000 | 7-9 / ~14,500 | 5-6 / ~8,000 | Korean EVA cosmetic and pharma specialist — 5-100 ml IBM benchmark |
| EP-ZQ60 | 12-14 / ~31,000 | 9-11 / ~18,000 | 7-9 / ~11,000 | High-volume Korean EVA cosmetic OEM, 150-200 ml body gel and tanning squeeze IBM |
ENGINEERING FAQ
Q 01
Why does EVA achieve lower haze than LDPE at comparable wall thickness?
EVA achieves lower wall haze than LDPE at comparable wall thickness for a structural reason rooted in polymer crystallinity. LDPE is a branched polyethylene with 45-60% crystallinity — the crystalline domains (spherulites) in the solidified LDPE wall scatter light at the crystal-amorphous boundaries, producing the 15-25% wall haze characteristic of LDPE IBM containers. EVA copolymer has vinyl acetate groups inserted along the polyethylene backbone that disrupt polyethylene chain packing into crystalline domains: at 18-28% VA content, EVA has only 5-15% crystallinity — the majority of the EVA wall is amorphous, with very few crystalline domains to scatter light. The result is significantly lower wall haze: EVA 18-28% VA IBM at 0.6 mm wall achieves 3-8% haze compared with LDPE IBM at 15-25% haze at the same wall. At VA content above 40%, EVA becomes essentially amorphous (crystallinity near zero) and approaches water-clear transparency at 0.6 mm wall — explaining why EVA 40-50% VA IBM containers appear nearly glass-clear despite being a soft flexible polymer. The practical consequence for Korean K-beauty cosmetic IBM: EVA 18-28% VA is the lowest-haze flexible IBM material available — clearer than PP RCP (5-12% haze) in addition to being softer, making EVA IBM the choice when Korean cosmetic brands require both a soft-squeeze tactile experience and visual clarity of the formulation through the container wall.
Q 02
What Korean cosmetic formulation types are NOT compatible with EVA IBM containers?
EVA IBM containers are well-suited for most Korean cosmetic formulations but three formulation categories present compatibility challenges for EVA IBM. High-concentration aromatic solvents: Korean cosmetic formulations with aromatic solvents above 5% (benzyl benzoate at 3-8%, benzyl alcohol at 2-5%, phenoxyethanol above 3%) can swell EVA — the polar vinyl acetate groups in EVA have greater affinity for polar aromatic solvents than LDPE, making EVA more susceptible to swelling with aromatic cosmetic ingredients. Verify EVA container weight gain at 40°C/90 days for Korean cosmetic formulations with aromatic solvent loading above 2%. Concentrated essential oils: Korean natural/organic cosmetic formulations with essential oil at 3-10% (citrus oils, eucalyptus oil, clove oil) contain terpene solvents (d-limonene, eugenol, eucalyptol) that interact with EVA more aggressively than with LDPE. Korean clean beauty formulations with citrus or herbal extract at 5%+ should be verified by accelerated compatibility testing before selecting EVA IBM containers. High-temperature-filled Korean cosmetics: some Korean cosmetic production facilities hot-fill cosmetic products at 50-70°C for sterilisation and filling viscosity management. EVA 18-28% VA begins to soften significantly above 60°C (EVA Vicat softening temperature 50-65°C for 18-28% VA) — hot-filling Korean cosmetics above 55°C into EVA IBM containers risks container deformation during filling. For Korean hot-fill cosmetic applications, HDPE or PP IBM containers are the correct choice. Most mainstream Korean K-beauty cosmetic formulations (aqueous gels, waterless oils, emulsions at ambient fill temperature) are fully compatible with EVA IBM without special compatibility testing.
Q 03
How does the IBM core rod stripping process differ for EVA versus LDPE and HDPE?
EVA IBM stripping requires specific core rod surface treatment to prevent EVA container sticking during the stripping station ejection, which becomes progressively more significant as VA content increases. LDPE and HDPE have low polarity and strip cleanly from standard polished steel core rod surfaces without adhesion because HDPE/LDPE-steel surface energy mismatch produces minimal adhesion. EVA’s vinyl acetate groups introduce polarity into the polymer — increasing EVA-metal surface adhesion at the stripping station. For EVA 5-14% VA: standard polished chrome or nickel-plated core rod surfaces (Ra 0.2-0.4 um) are adequate — the low VA content keeps surface polarity low enough for clean stripping. For EVA 18-28% VA: Korea Ever-Power applies a PTFE (Teflon) release coating (20-30 um thickness) on the IBM core rod to reduce EVA-metal adhesion at the stripping station. The PTFE coating reduces EVA-core rod adhesion by 60-70%, enabling clean stripping at 18-28% VA content without container distortion or base zone marks from sticking. PTFE coating durability: the PTFE release coating requires periodic renewal (every 1-2 million EVA IBM production cycles at 18-28% VA) as the coating gradually wears from repeated stripping contact. Korea Ever-Power maintains PTFE core rod re-coating as part of the EVA IBM mould maintenance schedule for Korean cosmetic EVA IBM production programmes. For EVA 40-50% VA: enhanced PTFE coating (40-50 um) and reduced stripping force (lower stripping cam speed on ZQ40) are both required — high VA content EVA containers approach rubber-like compliance and require very gentle stripping to prevent container collapse during ejection.
Q 04
What is the Korean food contact status of EVA IBM containers?
EVA copolymer is approved for direct food contact under Korean MFDS Food Packaging Material Standards (Korean MFoDS Notification, plastic container and packaging material positive list) and EU EC 10/2011 plastic food contact materials regulation, subject to VA content and additive restrictions. EVA is listed as an approved food contact polymer at VA content below 30% (Korean MFDS) and below 28% (EU EC 10/2011). The specific migration limit for vinyl acetate monomer from EVA food contact containers: 12 mg/kg food simulant (Korean MFDS and EU EC 10/2011) — commercial EVA IBM containers from food-grade EVA with VA content below 25% typically achieve vinyl acetate monomer migration below 2-5 mg/kg in aqueous food simulant, well within the Korean MFDS 12 mg/kg limit. Practical application: EVA 18-28% VA IBM containers are Korean MFDS food-contact approved for Korean food packaging applications including Korean condiment squeeze bottles (ketchup, mustard, soy sauce squeeze at ambient temperature) and Korean honey squeeze containers (ambient fill). Not approved for Korean hot-fill food (above EVA Vicat softening temperature) or Korean oil-based food simulant contact above 50°C. For Korean cosmetic applications, EVA IBM has no additional regulatory hurdle versus food contact — Korean cosmetic contact regulations are comparable to or less restrictive than Korean food contact for EVA polymer at VA content below 30%.
Q 05
Can EVA IBM containers be labelled with the same methods as LDPE IBM containers?
EVA IBM containers require modified labelling approach compared with LDPE IBM for pressure-sensitive labels (PSL) and direct print, because EVA’s vinyl acetate groups create a different surface energy profile from LDPE. Pressure-sensitive labels (PSL): EVA 18-28% VA IBM container surface energy (approximately 32-38 mN/m) is higher than LDPE (30-32 mN/m) but lower than PP (35-40 mN/m). Standard PSL adhesives formulated for polyolefin surfaces provide adequate adhesion to EVA IBM containers without surface pre-treatment — but Korean cosmetic brand PSL adhesion test (crosshatch tape peel test) should be conducted at ambient temperature (23°C) and at 5°C (Korean winter retail storage condition) since EVA IBM container surface becomes slightly more flexible below 10°C, potentially reducing PSL peel adhesion if the adhesive is not EVA-flexible-surface rated. Corona treatment: if PSL adhesion is inadequate on EVA IBM container body, corona surface treatment (raising EVA surface energy to 44-50 mN/m) improves adhesion to standard PSL specification. Heat-shrink sleeve: EVA IBM body at ±0.20 mm diameter consistency allows heat-shrink sleeve application with standard Korean cosmetic sleeve label shrink conditions (90-130°C steam tunnel, 1-2 second dwell) without container softening — EVA Vicat softening temperature for 18-28% VA is 50-65°C, above standard sleeve label tunnel temperature at Korean cosmetic filling line production speeds. Screen and UV print: EVA IBM surface accepts standard UV-curable cosmetic screen inks with light UV corona pre-treatment (EVA surface energy raised to 44+ mN/m for printing-grade adhesion); no corona is needed for adhesion-primed UV inks formulated for flexible polyolefin surfaces.
Q 06
How does Korea Ever-Power handle EVA IBM production sequencing with LDPE and HDPE on the same ZQ40?
Korea Ever-Power manages EVA, LDPE and HDPE IBM production on a shared ZQ40 through structured material changeover sequences and thermal management protocols. EVA-to-LDPE changeover: reduce barrel temperature from EVA range (140-165°C for 18-28% VA) to LDPE range (170-200°C) — barrel temperature increase from EVA to LDPE takes approximately 15-20 minutes. Purge barrel with LDPE resin (5-8 shots) to clear EVA from the barrel before starting LDPE pharmaceutical IBM production; EVA residue at LDPE temperatures is stable and purges cleanly. Mould temperature adjustment: EVA mould (5-12°C) to LDPE mould (8-15°C) is minimal — the 3-7°C difference is within standard chiller adjustment range without significant equilibration time. LDPE-to-EVA changeover: reduce barrel temperature from LDPE (170-200°C) to EVA (140-165°C) — barrel temperature decrease from LDPE to EVA requires approximately 20-30 minutes (cooling is slower than heating in barrel systems). Purge with EVA resin at EVA temperature (5-8 shots) before starting EVA production. HDPE-to-EVA changeover: the largest temperature drop in the ZQ40 multi-material schedule — HDPE barrel at 195-220°C to EVA at 140-165°C. Allow 35-45 minutes for full barrel temperature stabilisation from HDPE to EVA range before starting EVA production. Korea Ever-Power schedules EVA IBM production runs sequentially with LDPE runs to minimise total changeover time across the ZQ40 weekly schedule — EVA and LDPE barrel temperature ranges overlap sufficiently (LDPE lower range 170-180°C, EVA upper range 160-165°C) that LDPE-EVA transitions are the fastest changeovers in the ZQ40 multi-material schedule, typically 20-25 minutes versus 35-45 minutes for HDPE-EVA.
EVA IBM ENQUIRY · KOREA EVER-POWER
Korea Ever-Power provides EVA IBM container production on ZQ40 and ZQ60 with VA content grade selection, PTFE core rod treatment for high-VA grades, formulation compatibility testing support and Korean K-beauty cosmetic brand documentation.
Editor: Cxm
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