35mm – 80mm Neck Finish

The “Easy Refill” Revolution

Narrow necks are a bottleneck for production speed and consumer convenience. Our Wide Opening Series is engineered for high-viscosity filling, zero-waste evacuation, and effortless cleaning.

View Neck Standards →

Figure 1: The anatomy of a user-friendly refillable container.

Solving the Viscosity Challenge

Thick creams, masks, and gels struggle to flow through standard 24/410 necks. Widening the aperture solves multiple friction points in the supply chain.

+30%

Filling Line Speed

Wider target area allows for faster nozzle insertion/retraction without back-pressure splattering.

Product Waste

Consumers can access every last drop with a spatula or finger, unlike pump bottles which leave 15% residue.

100%

Washability

Fits a standard sponge or bottle brush, removing biofilm risks for safe refilling.

Consumer Logic: How It Works

The “Refill Revolution” fails if the process is messy. Our wide mouth design eliminates the need for funnels.

Open & Inspect
Twist-off cap reveals the full aperture (55mm+). User inspects for cleanliness.
Pour Direct
Refill pouch nozzle fits inside the jar neck. Gravity filling with zero side-spillage.
Seal & Store
Heavy-duty thread engagement ensures a hermetic seal for long-term storage.

One Concept, Many Applications

The “Wide Opening” philosophy isn’t limited to a single material. Golden Soar engineers this feature across our entire substrate portfolio to suit different chemical compatibilities.

🧴

Personal Care

Hair masks, body butters, scrubs (PP/PET).

💊

Wellness

Protein powders, supplements (HDPE).

🥣

Food

Spices, jams, dried goods (Tinplate).

🕯️

Home Fragrance

Candles, solid balms (Aluminum).

Figure 3: Versatility of wide mouth designs across different product categories.

Precision Injection Molding

Creating a large threaded opening requires extreme dimensional stability. If the neck ovalizes (becomes non-round) during cooling, the cap won’t seal.

We utilize High-Tonnage Injection Molding for our wide-mouth jars and caps. Unlike blow molding, this process forces molten plastic into a solid steel mold cavity under high pressure.

The Result: Thread tolerance of ±0.05mm. This precision ensures that even an 89mm cap screws on smoothly with a satisfying “lock” feeling, preventing cross-threading by the consumer.

Figure 4: Automated quality control ensuring circularity of wide neck finishes.

Neck Finish Specifications

Neck Standard	Opening ID (mm)	Thread Type	Recommended Application
38/400	28mm	Continuous	Vitamins, Gummies, Spices
53/400	43mm	Continuous	Body Creams, Hair Masks
70/400	60mm	Continuous	Protein Powder, Industrial Paste
89/400	79mm	Continuous	Bulk Food, Paint, Wax

Engineering FAQ

Do wide mouth jars require induction sealing? +

For products containing water or volatile oils, we highly recommend Induction Heat Sealing (IHS). The wide land area of our jars provides an excellent surface for foil adhesion, ensuring a hermetic seal that prevents leakage during shipping.

Are the caps lined? +

Yes. All our wide-mouth caps come with standard PE foam liners (F217) to ensure a tight closure. We can also upgrade to pressure-sensitive (PS) or heat-induction (HIS) liners upon request.

Can I get custom colors for the jars? +

Yes. For PP and PE jars, the MOQ for custom Pantone colors is typically 10,000 pieces. For Aluminum tins, we offer offset printing or custom anodized colors for orders over 30,000 pieces.

Ready to Optimize Your Filling Line?

Request a sample kit of our Wide Mouth series to test filling speed and cleaning ease.

Request Samples Back to Support