IBM in a single ZQ machine operation produces single-wall cosmetic cream jars — IBM cannot produce a double-walled cream jar (two concentric wall layers with an air gap between them) as a single IBM operation because IBM forms one continuous polymer layer from preform to finished container. Double-wall cosmetic cream jars require either two-component assembly (IBM inner jar + IM outer sleeve assembled at the Korean cosmetic brand filling line) or, for premium applications, two-shot IBM with secondary sleeve moulding (not standard Korea Ever-Power ZQ operation). Frosted finish IBM cream jars are achievable on ZQ40/ZQ60 by two methods: mould surface texturing (the blow mould cavity interior surface is bead-blasted or chemically etched to a defined roughness of Ra 0.4–1.6μm, which transfers to the PP cream jar exterior as a uniform frosted texture during blow inflation contact); or PP resin modification (PP filled with 0.5–1.0% fine silica anti-gloss additive produces a frosted matte surface from the PP material itself without mould surface texturing). Korea Ever-Power has produced frosted-finish IBM cream jars for Korean K-beauty brand customers (Innisfree, Etude) using blow mould cavity bead-blast texturing (Ra 0.8–1.2μm), achieving a consistent uniform frosted finish across all production cavities that Korean cosmetic brand QC approves at the cream jar first article approval stage.

Korea Ever-Power designs IBM cream jar neck thread geometry for a removal torque range of 0.3–0.8 Nm at the Korean cosmetic brand’s specified lid material and application torque. The relationship between IBM cream jar neck OD, thread pitch, thread engagement length and lid removal torque is determined by the Korean cosmetic brand’s lid closure specification — Korea Ever-Power’s cream jar mould engineering team calculates the required neck OD and thread geometry from the Korean brand’s lid specification to target 0.4–0.6 Nm removal torque as the Korean cosmetic industry standard for consumer-usable cream jar lids. IBM neck OD tolerance effect on torque: at 53mm mouth OD, each 0.1mm increase in neck OD produces approximately 0.08–0.12 Nm increase in lid removal torque at constant PP hardness — making IBM neck OD control (±0.03–0.05mm) the primary process variable for consistent Korean cosmetic cream jar lid torque across production batches. Korea Ever-Power conducts lid torque validation at ZQ60 cream jar mould qualification: 30-container torque measurement per cavity with Korean brand-supplied lid sample on a calibrated digital torque meter, confirming all cavities within ±0.05 Nm of Korean brand target torque before Korean cosmetic production approval.

Korea Ever-Power verifies IBM PP cream jar compatibility with Korean cosmetic formulations through a three-stage protocol aligned with Korean cosmetic product registration and Korean brand stability testing standards. Stage 1: material extractables screening — Korea Ever-Power provides Korean brand customers with PP resin manufacturer’s FDA 21 CFR compliance declaration and REACH restriction substance compliance certificate for the specific LG Chem SP191 or Lotte RP243 PP grade used in the cream jar production. Stage 2: Korean brand stability testing — the Korean cosmetic brand fills IBM cream jar samples (from ZQ60 first article production) with their cream formulation and conducts 45–90 day real-time stability testing at 25°C/60% RH and 40°C/75% RH accelerated conditions (Korean MFDS cosmetic stability test protocol). Stability testing checks: cream colour change, cream viscosity change, cream pH change, jar weight change (headspace vapour loss through PP wall), lid torque change after temperature cycling, and PP jar visual inspection for cream staining, deformation or odour. Stage 3: filling line validation — Korea Ever-Power IBM cream jar is validated on the Korean brand’s cosmetic filling line (automated cream filling machine) for fill accuracy, lid application torque, labelling adhesion and cartoning line compatibility before Korean cosmetic IBM container commercial supply approval.

Korea Ever-Power’s minimum annual volume threshold for dedicated IBM cream jar mould development varies by jar format and mould cavity count: for a standard 50ml PP cream jar on ZQ60 8-cavity mould, Korea Ever-Power requires a minimum annual volume commitment of 500,000 jars/year (approximately 2 weeks’ ZQ60 production time) to justify the mould development investment of KRW 8–15M for an 8-cavity cream jar mould set. For smaller Korean cosmetic brand programmes (50,000–200,000 jars/year), Korea Ever-Power offers two alternatives: shared mould programme (Korea Ever-Power’s standard cream jar mould in a commonly used Korean format — available in 30ml, 50ml and 100ml standard thread sizes — with the Korean brand’s colour programme, label design and lid selection applied to the standard jar form); or reduced-cavity mould (4-cavity cream jar mould at reduced tooling investment of KRW 5–8M, producing 50ml cream jars at 1,800 jars/hour on ZQ60 for Korean programmes up to 250,000 jars/year). For Korean cosmetic export programmes targeting global beauty brand supply (Sephora vendor, Ulta private label), Korea Ever-Power recommends 8-cavity mould with dedicated Korean IBM customer programme to achieve container cost competitiveness versus Korean cosmetic container imports from Chinese PETG jar suppliers.