90 cm Animal Sculpture Mold: RTV Silicone Skin, FRP Mother Mold and Cost Drivers

A 90 cm animal sculpture mold should not be quoted from height alone.

Two sculptures with the same overall height can have very different tooling costs because cost is driven by:

• master-model complexity;
• total silicone skin area;
• deep undercuts;
• number of mold sections;
• FRP shell area and flange structure;
• hollow vs solid casting strategy;
• labor to assemble and demold;
• freight volume.

For a standing bird, dog, deer or similar animal, the useful quote is a tooling-system quote, not "USD per kilogram of silicone."

Cost driver 1: how the master is created

If the buyer already has approved CAD/STL, the project can move directly into mold DFM.

If only photos exist, the project may require:

• 3D sculpting;
• proportion adjustment;
• turntable approval;
• master printing/CNC;
• surface finishing;
• assembly of printed sections.

For a realistic animal, the head, feathers/fur, legs and feet often require more modeling time than a simple geometric sculpture.

A low-resolution AI mesh may be useful for concept review but is not automatically production-ready.

Cost driver 2: sculpture surface area, not only height

A 90 cm tall slender bird can use less silicone than a 90 cm wide, thick animal.

Estimate:

• body circumference;
• wings/arms;
• legs;
• tail;
• accessories;
• base.

The RTV is usually applied as a controlled skin, not a full solid block.

The skin needs:

• detail coat;
• structural build;
• local reinforcement;
• keys/flanges.

Do not estimate silicone only from an external bounding box.

Cost driver 3: undercuts and section count

The most expensive geometry often sits around:

• legs;
• tail;
• wing/body gaps;
• horns;
• ears;
• open mouth;
• handles or accessories.

Each locked region may require:

• silicone slit;
• local removable plug;
• additional mold section;
• extra FRP shell section.

More sections mean more:

• flange fabrication;
• keys;
• hardware;
• assembly labor;
• fitting;
• QA.

A sculpture that can be released from two major sections is cheaper to operate than one requiring eight small plugs.

Cost driver 4: FRP mother mold complexity

The rigid mother mold holds the RTV skin in its approved shape.

FRP cost depends on:

• shell surface area;
• number of sections;
• laminate stiffness;
• flange width;
• local reinforcements;
• bolts/clamps;
• handles;
• trimming and fitting.

A tall narrow shell may need reinforcement to prevent long-span flex.

The FRP should be designed around the filled load and handling method.

Cost driver 5: final casting material

The mold structure changes if the buyer pours:

• polyurethane resin;
• epoxy;
• plaster/gypsum;
• concrete/mineral composite;
• wax;
• another material.

Heavy solid casting

Requires more external support.

Hollow resin casting

May use slush/rotational layers or an inner-core strategy.

Brittle plaster

Needs a gentler demolding path.

Concrete

Adds high wet load, vibration and abrasive wear.

The quote should name the casting material.

Cost driver 6: solid vs hollow final sculpture

A life-size decorative animal is often better as a hollow casting.

Hollow production can reduce final product weight, but the mold/process becomes more complicated if it needs:

• inner core;
• rotational/slush access;
• shell reinforcement;
• staged resin layers;
• internal support.

Do not decide mold construction until the final production method is clear.

Example procurement scenario: 90 cm standing bird

Assume the buyer has only reference photos and wants a realistic standing bird around 900 mm tall.

A reasonable development scope may include:

1. 3D reconstruction from multi-angle references;
2. turntable render approval;
3. master model split into printable/machinable sections;
4. final master finishing;
5. brush-on RTV detail skin;
6. planned local openings around legs/wings;
7. multi-section FRP support shell;
8. hardware and assembly labels;
9. one full test casting;
10. photo/video approval before shipment.

That is why a quote that lists only "silicone mold: USD X" is difficult to compare.

How to compare two quotes

Ask both suppliers to separate:

• 3D modeling;
• master;
• RTV silicone;
• FRP mother mold;
• hardware;
• test casting;
• packaging;
• freight.

Then ask:

• How many silicone sections?
• How many FRP sections?
• Is the master included?
• Is one test casting included?
• Who owns the master?
• Can the RTV skin be recast from the same master later?
• Is the shell reusable with replacement skins?

This creates an apples-to-apples comparison.

Freight can be a major cost driver

Large shell sections consume dimensional volume.

Design choices that reduce freight:

• shell splits sized for a crate;
• nested FRP sections where safe;
• removable hardware;
• silicone shipped seated in shell;
• clear assembly labels.

Do not fold a large RTV skin simply to reduce carton size unless the material/geometry has been proven to recover without permanent set.

First full casting is the real acceptance test

Before shipment, verify:

• global sculpture shape;
• seam;
• detail reproduction;
• shell registration;
• opening sequence;
• support under full load;
• safe demolding;
• reassembly.

A dry-fit photo does not prove a 90 cm mold works.

Relationship to other RUUIPON pages

P41 should remain the general large-sculpture engineering guide.

P71 is different:

a concrete 90 cm procurement scenario with cost scope and quote-comparison logic.

Link P71 to:

• P41 large sculpture;
• P35 FRP process;
• P37 removable plugs;
• P38 core design.