Buying an air-blowing shoe mold is not only a matter of sending a shoe photo and asking for a price. The mold has to work as part of a complete production system: the shoe design, compound, injection machine, air-control arrangement, size run and approval standard must all be compatible.

A clear request for quotation helps an air-blowing shoe mold manufacturer evaluate the tooling structure before machining begins. It also makes quotations easier to compare because each supplier is working from the same technical brief. This checklist covers the information footwear factories, brands and sourcing teams should prepare.

1. Identify the Exact Product Construction

Begin with the product type. State whether the project is a full injected shoe, slipper, sandal, clog, casual shoe or separately molded sole. Similar-looking products may use different mold structures, lasts and opening sequences.

Send clear views of the top, sides, bottom and heel. A physical reference sample is useful when available, but photographs alone are not enough for tooling. Provide a dimensioned drawing, approved 3D file or a sample that the mold maker can measure. Mark any features that must remain unchanged, including straps, ventilation openings, tread geometry, logos and decorative textures.

2. Clarify What “Air-Blowing” Means in Your Factory

Terminology varies between markets and equipment suppliers. “Air-blowing shoe” can refer to a particular air-assisted production method, while “foamed shoe” describes a cellular material structure. The terms can overlap, but they are not automatically interchangeable.

Explain the process used on your production line instead of relying on the product name alone. Confirm whether the machine supplies air to the mold, how the mold connects to that system and whether the compound is designed to expand. For a fuller process comparison, read our guide to foamed shoes versus air-blown shoes.

3. Provide the Injection Machine Brand and Model

The machine specification is one of the most important items in an air-blowing shoe mold RFQ. Include the manufacturer, model, number of stations and any available technical drawing for the mold carrier.

The mold maker should review the available mold space, mounting pattern, nozzle position, opening stroke and clamping arrangement. If the machine has dedicated air connections, cooling connections or ejector interfaces, show their locations and connection types. A mold designed around assumptions may require avoidable rework when it reaches the factory.

4. Share the Existing Mold Interface

If the factory already runs compatible molds, provide photographs and measured drawings of one approved mold set. Useful dimensions include the overall mold envelope, plate thickness, locating features, mounting holes and the relationship between the gate and machine nozzle.

Do not send only a single overall length and width. The location of interfaces matters as much as their size. Clearly label left and right shoes, machine-side orientation and the direction of mold opening.

5. Specify the Compound and Material Supplier

State the exact compound family and grade planned for production. Air-blowing footwear equipment is commonly marketed for materials such as PVC or TPR, but that does not mean one mold specification suits every compound.

Provide the material supplier's technical data where possible, along with the target hardness, density or finished weight required for the approved product. If the compound already contains a foaming package, state that clearly. The mold maker should not invent a recipe or processing setting; those decisions need coordination with the compound supplier and production team.

6. Define the Target Shoe Weight and Feel

Words such as “light,” “soft” and “flexible” are subjective. Give measurable targets based on an approved sample. Record the sample size, finished pair weight, hardness test method and the areas where flexibility matters.

If no approved sample exists, identify the comparison product and explain which properties should be matched. This gives the mold designer a clearer basis for discussing cavity geometry, wall distribution and sampling criteria without claiming that the mold alone controls every material property.

7. List the Complete Size Range

Include every planned size and the sizing system, such as EU, UK or US. Confirm whether half sizes are required and whether the same project includes men's, women's or children's lasts.

Size grading should follow approved fit and design rules. Foot length, width, instep volume, tread proportions and upper openings do not always scale at one identical percentage. State who supplies the lasts and whether each last has already been approved for production.

8. Define Color and Surface Requirements

List the planned colors and whether the finish should be glossy, matte or textured. Identify areas that need polishing, leather grain, fabric-like texture, embossed branding or a functional tread.

For molded logos, provide vector artwork and exact dimensions. Confirm the location and whether the mark should be raised or recessed. Late logo changes can require recutting a finished cavity, so branding should be approved before CNC machining or final engraving.

9. Explain Gate, Trim and Appearance Priorities

Show which surfaces are most visible to the customer and where a gate vestige or trim line would be unacceptable. The gate and runner arrangement must support filling, but it also affects trimming and appearance.

Provide an approved sample with the preferred trim condition if possible. If the product includes thin straps, deep tread, narrow ribs or enclosed details, highlight them for flow and venting review. These areas may need particular attention during mold design and trials.

10. Describe Air, Venting and Cooling Connections

For an air-assisted process, document the factory's connection layout and operating sequence. Include photographs or drawings of hoses, fittings, seals and machine-side interfaces. Do not assume that a connection used by one machine model will fit another.

Venting and air-control features should be reviewed together with the compound and filling pattern. Cooling arrangements also affect how the product stabilizes before demolding. The RFQ does not need to prescribe unverified settings, but it should identify the available utilities and interfaces.

11. Set a Sample Approval Standard

Agree in advance on how trial samples will be evaluated. Typical checkpoints include finished dimensions, pair weight, left-right consistency, surface condition, tread definition, hardness, fit and the absence of unacceptable short fill, burns, bubbles, flash or deformation.

Record the material batch and machine used for the trial. Measure samples after the agreed cooling or conditioning period. When a result is outside the target, separate mold, material and process causes before requesting a steel change.

12. State Commercial and Project Requirements

Include the number of mold sets required, expected production use, delivery destination and the documents needed with the shipment. Ask what is included in the quotation: design review, 3D development, sampling, revisions, spare parts, packing and technical documentation may be handled differently by each supplier.

Also identify the person responsible for technical approval. Consolidated feedback from one authorized contact reduces conflicting revisions and helps keep the approved design traceable.

Air-Blowing Shoe Mold RFQ Checklist

• Product type and construction
• Physical sample, dimensioned drawing or approved 3D file
• Actual air-blowing process used by the factory
• Injection machine brand, model and station configuration
• Mold mounting, nozzle, air and cooling interfaces
• Compound family, grade and supplier data
• Target size, weight, hardness and appearance
• Complete size range and approved lasts
• Colors, textures, logos and tread requirements
• Preferred gate, trim and cosmetic zones
• Sample evaluation and approval criteria
• Quantity, destination and required documentation

Why a Complete RFQ Saves Time

A complete RFQ does not lock the buyer into a finished engineering solution. It gives the mold maker enough information to identify missing decisions and propose a compatible tooling approach. It also reduces the risk of comparing quotations that cover different mold structures or different levels of service.

Apollo Mold manufactures custom injection footwear tooling in Jieyang, Guangdong. Our work covers air-blowing shoes, PVC jelly shoes, rain boots and other molded footwear. Explore our injection shoe mold services or contact Apollo Mold with your shoe design, machine information, material details and size range.

Frequently Asked Questions

What is the most important information for an air-blowing shoe mold quotation?

The approved product design, injection machine model, air-system interface, compound and complete size range are the essential starting points. Without them, the supplier cannot reliably assess compatibility.

Can a mold be designed from a shoe photograph?

A photograph can begin a discussion, but it does not define dimensions, fit, cavity structure or machine interfaces. A physical sample, technical drawing or approved 3D model is needed before tooling.

Can the same air-blowing shoe mold run on different machines?

Not automatically. Compatibility depends on mold size, mounting, nozzle location, clamping, opening stroke, air connections, cooling and the production sequence. Each proposed machine should be reviewed.

Should the mold maker choose the PVC or TPR recipe?

The compound should be selected and validated with the material supplier and production team. The mold designer uses the confirmed material and process information to develop compatible tooling.

What should be checked during the first mold trial?

Check finished dimensions, weight, surface appearance, tread detail, hardness, fit, left-right consistency and visible defects. Record the material and machine conditions so the approved result can be reproduced.