Soy Candle Wick Size Chart:
CD & ECO Sizing for Golden Wax 464
Published on October 9, 2026 • By MakerRatio Studio Team • Calibrated to Heinz Verhaegh & CandleScience TDS
Combustion Science: Matching container internal diameter to cotton/paper flat braid wick series across Golden Brands 464 soy wax.
What size wick should you use for soy wax candles? For a standard 3.0-inch (76mm) diameter container made with Golden Wax 464 and an 8% fragrance load, use a Heinz Verhaegh CD 10 or a CandleScience ECO 8 wick. Soy wax requires a larger wick than paraffin because molten natural soybean lipids have higher viscosity and higher melt points. Any container wider than 3.0 to 3.25 inches (76–82mm) requires double-wicking with two smaller wicks spaced 1 inch apart to prevent tunneling without overheating the vessel.
Calculate Container Wick Size & Burn Hours
Select container diameter, soy wax brand, and fragrance percentage to compute exact wick recommendations and total burn pool hours.
Few craft mistakes are as frustrating as lighting a handcrafted candle after two weeks of patient curing, only to watch the flame drill a narrow 1-inch hole straight down the core—drowning in its own melt pool while leaving half the jar's wax frozen to the glass walls.
This classic defect is called candle tunneling, and it happens when your container's internal diameter doesn't match your wick's fuel draw rate.
Conversely, makers who overcompensate by choosing a giant industrial wick face the opposite disaster: tall, flickering torch flames, excessive black soot streaks, giant carbon "mushrooms" that pop hot embers, and thermal shock that can crack glass jars. Here is the practical wick sizing chart for Golden Brands 464, along with the rules for fragrance load and container diameter.
Why Soy Wax Demands Specialized Wicks (CD & ECO Series)
Unlike petroleum paraffin, which consists of short, highly refined hydrocarbon chains that melt into a water-thin liquid (compare burn profiles in our detailed Candle Wax Types Guide: Soy vs Paraffin vs Coconut), 100% natural soy wax (such as Golden Brands 464 or NatureWax C-3) is composed of hydrogenated soybean triglycerides:
1. Molten Viscosity Barrier
When melted, natural soy wax has a significantly higher kinematic viscosity than paraffin. Standard zinc-core or flat cotton wicks lack sufficient capillary suction pressure to draw viscous plant lipids upward against gravity, starving the flame and causing it to extinguish.
2. The Solution: CD & ECO Series
CD (KRA-CD) Series: Flat braided cotton wicks interwoven with special paper filaments. The paper filaments provide rigid structure and directional curl, creating a self-trimming 90° angle that consumes carbon build-up cleanly.
ECO Series: Flat cotton wicks braided with thin paper filaments designed specifically for lower-melt-point vegetable waxes.
Master Wick Size Chart for Golden Brands 464 Soy Wax
This empirical sizing matrix matches internal container diameter (measured across the widest point inside the jar) to the correct wick code at a standard 6% to 8% fragrance load:
| Container Inside Diameter | Heinz Verhaegh CD Series | CandleScience ECO Series | Atkins & Pearce HTP Series | Melt Pool Window |
|---|---|---|---|---|
| 1.5" – 2.0" (Votives & Sample Tins) | CD 4 | ECO 2 | HTP 41 | 1.0 – 1.5 Hours |
| 2.0" – 2.5" (Small 4 oz Jelly Jars) | CD 6 | ECO 4 | HTP 62 | 1.5 – 2.0 Hours |
| 2.5" – 2.8" (Standard 8 oz Mason Jars) | CD 8 | ECO 6 | HTP 83 | 2.0 – 2.5 Hours |
| 2.8" – 3.1" (Straight Sided Tumblers) | CD 10 | ECO 8 | HTP 104 | 2.5 – 3.0 Hours |
| 3.1" – 3.4" (Wide 12 oz Libbey Jars) | CD 12 – CD 14 | ECO 10 – ECO 12 | HTP 126 | 3.0 – 3.5 Hours |
| > 3.25" – 4.0" (Large Vessels / Bowls) | MANDATORY DOUBLE WICK: 2 × CD 4 or 2 × ECO 2 | 2.5 – 3.0 Hours | ||
The Fragrance Load Step-Up Rule
Wick size charts are calibrated using unfragranced, uncolored soy wax. Adding aromatic fragrance oils introduces dense, heavy organic esters and solvent carriers that alter fuel delivery:
If your fragrance oil load is 8% to 10% by weight (calculate your exact oil weight with our Fragrance Load Calculation Guide), or if you use heavy resinous base notes (vanilla, amber, patchouli, oud), the oil molecules physically constrict the capillary pores of the wick braid. Step up one full wick size from the baseline chart (e.g., if a 2.8" jar calls for CD 8, use CD 10 to maintain an edge-to-edge melt pool).
The 3-Inch Rule: When and How to Double-Wick
A single cotton wick has a maximum thermal radius. For pure soy wax, that radius caps out at approximately 1.5 inches (38mm) in every direction from the center (a 3.0-inch total burn pool diameter).
Attempting to force a single giant wick (like a CD 22 or ECO 14) to melt a 3.75-inch bowl creates an extreme vertical heat column. The flame reaches 2+ inches tall, throws thick black carbon soot, and overheats the glass bottom, yet still fails to melt the outer perimeter.
Recommended Materials for Soy Candle Testing
Calibrate your craft formulations with industry-standard Golden Wax 464, digital thermometer probes, and genuine German CD wicks:
Recommended Materials & Tools for this Project
Craft Candle Fragrance Oils Aromatherapy Set
Specification: High-flash-point concentrated fragrance oils formulated for clean binding with soy, coconut, and paraffin waxes.
Precision Digital Gram Scale (0.01g Accuracy)
Specification: Tare-capable digital scale with 0.01g to 500g range for exact Part A and Part B chemical weight measurement.
Transparency Notice: As an Amazon Associate, MakerRatio earns from qualifying purchases at zero extra cost to you. Product recommendations are selected based on verified Manufacturer Technical Data Sheets (TDS). Always consult chemical safety data before pouring.
Related Candle Formulation Guides & Precision Tools
Frequently Asked Questions About Soy Candle Wick Sizing
How deep should a candle melt pool be?
A properly wicked soy candle should form an edge-to-edge liquid pool between 1/4 inch and 1/2 inch (6mm to 12mm) deep within 2 to 3 hours of lighting.
Why does my candle wick form a carbon mushroom?
Carbon mushrooms occur when the wick is oversized or the fragrance load exceeds 10%, causing unburned carbon and heavy oils to collect at the top of the wick.
What is the difference between CD and ECO wicks?
Both are flat cotton braids with paper filaments. CD wicks curl tightly at a 90° angle for clean self-trimming, while ECO wicks burn slightly cooler with lower curl.
At what container diameter is double-wicking required?
Any container with an inside diameter exceeding 3.0 to 3.25 inches (76–82mm) requires double-wicking to prevent tunneling without creating an unsafe, smoking torch flame.
How long should soy candles cure before burn testing?
Cure Golden Wax 464 candles for a minimum of 7 to 14 days. Burning too early gives false burn test data because soy wax crystalline polymorphism continues to harden over two weeks.