UnionFill with Lidocaine — Korean Strong Bond HA Dermal Filler in Soft, Deep & Hard
A Korean dermal filler series from Double J Holdings featuring 24 mg/mL cross-linked hyaluronic acid and 3 mg/mL lidocaine. Built on the proprietary HCCL (Homogeneous HA Crosslinking) technique, with lab-tested BDDE residue not detected and endotoxin levels below 0.5 EU. Three variants — Soft, Deep, Hard — cover the spectrum from upper dermis fine lines to lip contour and deep volume placement.
Last reviewed: May 2026 · Manufacturer: Double J Holdings, Seoul, South Korea
Homogeneous HA Crosslinking — The Strong Bond Behind UnionFill
Homogeneous Matrix
HCCL creates a uniform cross-linked HA network rather than the patchy biphasic structure found in some legacy fillers. The homogeneous matrix maintains viscosity over time and resists premature degradation, supporting consistent in-tissue performance across the treatment window.
BDDE Not Detected
Third-party lab testing of UnionFill confirms BDDE residue is below detection limits (specification: ≤ 2.0 ppm; actual: N.D.). This is below the safety threshold required for CE-class HA fillers, addressing one of the historical safety concerns around BDDE-cross-linked products.
Low Endotoxin
Endotoxin levels in UnionFill measure below 0.5 EU per gram in standard product testing. Low endotoxin reduces the risk of inflammatory reactions at the injection site, which matters particularly for the Hard variant used in lip and vermillion border placements.
UnionFill Soft, Deep & Hard — Choosing the Right Texture
UnionFill Soft
Lowest viscosity in the UnionFill series. Engineered for upper dermis placement targeting fine lines, crow’s feet, and superficial smoothing. Lightweight texture flows easily through a 30G needle.
UnionFill Deep
Mid-dermis variant for moderate volume correction. Targets nasolabial folds, marionette lines, and contour shaping where a balance of projection and tissue integration is needed.
UnionFill Hard
Highest viscosity for deep dermis and subcutaneous placement. Engineered for lip volume, vermillion border definition, and structural augmentation requiring sustained projection.
UnionFill Active Ingredients & Lab-Verified Purity
Cross-Linked Hyaluronic Acid
Cross-linked using the proprietary HCCL (Homogeneous HA Crosslinking) technique to form a uniform, stable gel matrix. The 24 mg/mL concentration sits within the specified range of 21.6–26.4 mg/mL across the product line. pH measures 6.9 (within the 6.0–8.0 spec range), consistent with native skin pH for biocompatibility.
Lidocaine HCl
Built-in local anaesthetic for injection comfort. Premixed at 3 mg/mL across all three UnionFill variants — particularly relevant for the Hard variant placed in the highly innervated lip and vermillion border zones.
Purity Testing Results
- BDDE residue: Not detected (specification: ≤ 2.0 ppm)
- Endotoxin: < 0.5 EU per gram (specification: ≤ 0.5 EU/g)
- Sterility: Complies — no microbial growth
- Net content: > 1.0 mL per syringe
UnionFill vs Revolax vs Belotero
| Feature | UnionFill | Revolax | Belotero |
|---|---|---|---|
| HA Concentration | 24 mg/mL | 24 mg/mL | 22.5–25.5 mg/mL |
| Lidocaine | 3 mg/mL | 3 mg/mL | 3 mg/mL (Lidocaine line) |
| BDDE Residue (tested) | Not Detected | ≤ 2 ppm (manufacturer spec) | ≤ 2 ppm (manufacturer spec) |
| Cross-Linking Tech | HCCL Homogeneous | Monophasic Mono-densified | CPM (Cohesive Polydensified Matrix) |
| Variants Available | 3 (Soft / Deep / Hard) | 3 (Fine / Deep / Sub-Q) | 5+ (Soft / Balance / Intense / Volume etc.) |
| Volume Per Syringe | 1.0 mL | 1.1 mL | 1.0 mL |
| Origin | South Korea (Double J Holdings) | South Korea (Across) | Germany (Merz) |
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Comparison based on manufacturer published data and third-party lab testing where available. See our top dermal filler comparison guide for broader context.
UnionFill Product Specifications
Manufacturer
- Brand: Double J Holdings
- Location: Seoul, South Korea
- Tagline: Strong Bond HA Filler
- Audience: Licensed practitioners
Formula
- Hyaluronic Acid: 24 mg/mL cross-linked
- Lidocaine HCl: 3 mg/mL
- Cross-linker: BDDE (residue N.D.)
- pH: 6.9 (range 6.0–8.0)
Purity
- BDDE: Not detected
- Endotoxin: < 0.5 EU/g
- Sterility: Complies
- Technology: HCCL
Packaging & Storage
- Pack: 1 mL prefilled syringe per box
- Storage: Room temperature, no direct sunlight
- Shelf life: 24 months
- Use: Single-use sterile
For market pricing context, see our dermal filler pricing guide.
UnionFill with Lidocaine — Frequently Asked Questions
What is UnionFill with Lidocaine dermal filler?
UnionFill is a Korean cross-linked hyaluronic acid dermal filler manufactured by Double J Holdings in Seoul, South Korea. Each 1 mL prefilled syringe contains 24 mg/mL HA and 3 mg/mL lidocaine. The product is built on HCCL (Homogeneous HA Crosslinking) technology and is available in three variants — Soft, Deep, and Hard — covering superficial fine lines through to lip volume and structural augmentation.
What is the difference between UnionFill Soft, Deep, and Hard?
All three share 24 mg/mL HA and 3 mg/mL lidocaine but differ in viscosity and injection depth. UnionFill Soft (lowest viscosity) targets upper dermis fine lines. UnionFill Deep (mid viscosity) addresses nasolabial folds and cheek contour. UnionFill Hard (highest viscosity) is engineered for lip volume, vermillion border definition, and structural augmentation in the deep dermis.
What does “BDDE not detected” mean for UnionFill?
BDDE (1,4-butanediol diglycidyl ether) is the cross-linking agent used to create stable HA matrices in most modern fillers. CE-grade fillers must keep residual BDDE below 2.0 ppm. Third-party lab testing of UnionFill confirms BDDE residue is not detected — below the detection limit of the test method. This addresses a historical concern around BDDE residue in cross-linked HA products.
What is HCCL technology in UnionFill?
HCCL stands for Homogeneous HA Crosslinking — the proprietary technique Double J Holdings uses to produce UnionFill. The technology creates a uniform cross-linked HA matrix rather than the patchy biphasic structure of some legacy fillers. This homogeneous matrix supports consistent viscosity, predictable extrusion, and resistance to premature degradation in tissue.
Where is UnionFill manufactured and who makes it?
UnionFill is manufactured by Double J Holdings, a Korean medical device company based in Seoul, South Korea. The product is positioned in the Korean filler market as a “Strong Bond HA Filler” emphasising cross-linking density and the resulting in-tissue durability. Manufacturing follows Korean medical device quality system requirements.
Is UnionFill FDA approved or CE certified?
UnionFill is KFDA registered in South Korea. Specific FDA or CE certification status should be confirmed with the manufacturer for your jurisdiction; regulatory approval varies by country and changes over time. Buyers are responsible for verifying that import and clinical use are permitted in their region before ordering.
Can UnionFill variants be combined in the same session?
Yes — UnionFill Soft, Deep, and Hard can be layered across different anatomical zones in one treatment session. A common approach is UnionFill Hard in the lip body, UnionFill Deep in the nasolabial folds, and UnionFill Soft for perioral fine lines. All three share the same HA chemistry and cross-linking technique, so layered biocompatibility is consistent.
How long do UnionFill results last?
Duration depends on the variant chosen and the anatomical site treated. Higher cross-linking density in UnionFill Deep and Hard supports longer in-tissue durability than the Soft variant. Final duration varies by individual patient metabolism, injection technique, lip or facial movement intensity, and dose. Most cross-linked HA fillers in this concentration range deliver 8–18 months depending on placement.
How should UnionFill be stored?
Store UnionFill at room temperature, away from direct sunlight. Do not freeze. Shelf life is 24 months from the manufacturing date printed on the box. Once a syringe is opened, contents must be used immediately — partial syringes cannot be retained for later use.
Does UnionFill contain animal-derived ingredients?
No. UnionFill uses non-animal hyaluronic acid produced by bacterial fermentation — the standard manufacturing approach for modern HA dermal fillers. The product contains no animal proteins or by-products, making it suitable for patients who avoid animal-derived medical products.
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Browse category →Read Before Clinical Use
UnionFill is a prescription medical device for use only by licensed aesthetic practitioners. Common reactions include injection-site bruising, swelling, redness, and tenderness, generally resolving within days. Like all hyaluronic acid dermal fillers, treatment carries rare but serious risks. The Hard variant placed in highly vascular zones such as the lip and vermillion border warrants heightened anatomical awareness. Full contraindications, vascular complication protocols, aftercare, and emergency guidance are detailed on the dermal filler safety page.
Read Full Dermal Filler Safety Information →Fillersfairy.com is a distributor and does not provide medical advice. This page is for informational purposes only and does not replace the manufacturer’s official Instructions for Use, which remains the authoritative source for clinical administration. Regulatory status varies by jurisdiction — buyers are responsible for verifying legal status before ordering.
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