Silver clay firing tips and info

Silver clay firing tips and info

What You Need to Know Before Firing Silver Clay

Firing silver clay jewellery is one of the most exciting stages of the silver jewellery making process — and also the one that causes the most anxiety. Questions around temperatures, timings, compatibility between clays, and what can and can’t be fired together are extremely common, even among experienced makers.

At Louise Anne Designs, firing knowledge is something we build carefully and confidently through our silver clay jewellery courses and Art Clay Diploma tuition. 

Understanding how different silver clays behave in the kiln allows you to work more freely, design more complex pieces, and avoid costly mistakes.

In this guide, we will cover:

  • Whether you can fire different types of silver clay together

  • The differences between fine silver clay and sterling silver clay

  • Firing clays from different manufacturers with different schedules

  • Refiring silver clay safely

  • Adding unfired silver clay to fired silver clay

  • Firing silver clay jewellery with glass

Whether you fire using a kiln, torch, or combination of both, these firing tips will help you get consistent, professional results.


Understanding Silver Clay Before Firing

Silver clay is made from microscopic silver particles combined with an organic binder and water. During firing, the binder burns away and the silver particles sinter together, creating solid metal.

What varies between different types of silver clay is:

  • The size and shape of the silver particles

  • The binder formulation

  • The firing temperature and hold time required for full sintering

These differences are what affect whether clays can be fired together and how forgiving they are when refired or combined.

Can I Fire Different Types of Silver Clay Together?

This is one of the most frequently asked questions in silver clay jewellery making — and the answer is:

Sometimes yes, sometimes no — it depends on the clay.

The key factors to consider are:

  • Fine silver vs sterling silver

  • Manufacturer firing requirements

  • Kiln temperature accuracy

  • Thickness and complexity of the pieces

Let’s break this down clearly.

Firing Fine Silver Clay and Sterling Silver Clay Together

Fine Silver Clay

Fine silver clay (99.9% silver) is the most forgiving and widely used type of silver clay. It generally fires at:

  • 650°C–800°C

  • With hold times ranging from 30 minutes to 2 hours, depending on the brand and thickness

Examples include:

  • Art Clay Silver (Standard, 650)

  • PMC+ and PMC3

  • Most low-fire fine silver clays

Sterling Silver Clay

Sterling silver clay contains copper (usually 7.5%), which introduces complexity during firing. It requires:

  • Higher temperatures

  • Often carbon firing

  • Longer, more precise schedules

Examples include:

  • Art Clay Silver Sterling

  • PMC Sterling

  • Other alloyed silver clays

Can they be fired together?

No — fine silver clay and sterling silver clay should NOT be fired together in the same firing cycle.

Reasons:

  • Sterling clay needs higher temperatures and often a carbon environment

  • Fine silver fired at sterling temperatures risks:

    • Slumping

    • Over-sintering

    • Surface damage

  • Fine silver fired in carbon unnecessarily can dull surfaces and reduce control

Best practice:
Fire fine silver clay and sterling silver clay in separate firings, even if they are part of the same jewellery collection.

Firing Different Brands of Fine Silver Clay Together

This is where things become more flexible — but still require care.

Different manufacturers produce fine silver clays with different recommended firing schedules, for example:

  • One clay may require 650°C for 30 minutes

  • Another may recommend 800°C for 2 hours

The golden rule

You can fire different fine silver clays together only if you fire to the highest required temperature and time — and only if all pieces can safely tolerate that schedule.

Practical example

If you are firing:

  • Clay A: 700°C for 30 minutes

  • Clay B: 800°C for 2 hours

You must fire everything at 800°C for 2 hours.

Before doing this, ask:

  • Are any pieces thin, delicate, or hollow?

  • Are there textures that could soften or distort?

  • Has the clay manufacturer stated a maximum temperature?

If the answer to any of these is yes, separate firings are safer.

Refiring Silver Clay Jewellery: Is It Safe?

Yes — refiring silver clay is not only safe, it is often necessary.

Silver clay jewellery can be refired multiple times provided:

  • The piece is fully sintered

  • You do not exceed the clay’s maximum firing temperature

  • You understand what changes refiring can cause

Common reasons for refiring

  • To improve strength

  • To repair cracks

  • To add new elements

  • To correct under-firing

  • To fuse additional silver clay

What happens during refiring?

Refiring allows further sintering, which can:

  • Increase density

  • Improve durability

  • Slightly reduce porosity

However, repeated refiring at high temperatures can:

  • Soften fine details

  • Round sharp edges

  • Increase grain growth

Tip: If you are refiring purely for strength, increase time rather than temperature wherever possible.

Adding Unfired Silver Clay to Fired Silver Clay

This is an incredibly useful technique and one that opens up advanced design possibilities.

Yes — you can add unfired silver clay to fired silver clay

But preparation is essential.

How to do it successfully

  1. Clean the fired silver thoroughly

    • Use a fibre brush, fine sandpaper, or abrasive sponge

    • Remove polish, grease, oxidation, and fingerprints

  2. Moisten the fired silver slightly

    • Use water or silver clay slip

    • This helps adhesion

  3. Apply fresh silver clay securely

    • Ensure good contact

    • Avoid thin joins unless reinforced

  4. Dry completely

    • Any moisture trapped at the join can cause cracking

  5. Refire according to the new clay’s firing schedule

Best uses for this technique

  • Adding bails

  • Repairing breaks

  • Building layers

  • Attaching embellishments

  • Fixing mistakes without starting again

At Louise Anne Designs, this method is taught as part of our intermediate and diploma-level silver clay jewellery courses.

Firing Silver Clay Jewellery with Glass

Glass and silver clay can work beautifully together — but only when handled correctly.

The main challenge

Glass and silver expand and contract at different rates. Incorrect firing can cause:

  • Cracking

  • Glass popping out

  • Stress fractures

Types of glass commonly used

  • Kiln-formed glass

  • Dichroic glass

  • Frit

  • Cabochons designed for metal clay use

Key firing considerations

  • Glass must be rated for kiln temperatures compatible with silver clay

  • Many glasses begin to soften around 700°C

  • Most fine silver clays sinter well at 650–700°C

Best practice for firing with glass

  • Use low-fire fine silver clay

  • Fire at the lowest temperature that still achieves full sintering

  • Shorter hold times reduce stress on the glass

  • Always support glass mechanically rather than relying on shrinkage alone

Never:

  • Fire standard glass at sterling silver temperatures

  • Assume all glass can tolerate kiln firing

  • Rapid cool pieces containing glass

Pro tip: Always test new glass on a sample piece before committing it to a finished design.

Can I Torch Fire Pieces That Have Been Kiln Fired?

Yes — with caution.

Torch firing is ideal for:

  • Small repairs

  • Reattaching elements

  • Spot sintering

However:

  • Sterling silver clay should not be torch fired

  • Glass should not be torch fired once set

  • Even heating is difficult with complex pieces

For professional results, kiln refiring is always preferred.

Common Firing Mistakes to Avoid

  • Mixing sterling and fine silver in the same firing

  • Guessing firing schedules instead of checking manufacturer guidance

  • Over-firing delicate pieces “just to be safe”

  • Refiring without cleaning fired silver first

  • Firing glass without testing

  • Rushing cooling times

Building Confidence with Silver Clay Firing

Understanding firing is one of the biggest steps from hobbyist to confident jewellery maker. Once you understand:

  • How different silver clays behave

  • When clays can be fired together

  • How refiring works

  • How to safely combine materials

You gain far more freedom in your designs.

At Louise Anne Designs, firing knowledge is built step-by-step through our silver clay jewellery workshops and Art Clay Diploma courses, ensuring students leave with both practical skills and technical understanding.

Final Thoughts

Silver clay firing does not need to be intimidating. With the right knowledge, careful planning, and respect for each material’s limits, it becomes a powerful creative tool rather than a source of stress.

If you ever feel unsure, remember:

  • Separate firings are always safer

  • Test pieces save heartbreak

  • There is almost always a way to fix or refire silver clay

And if you’d like guided, hands-on experience with kiln firing, troubleshooting, and advanced silver clay techniques, you’ll find them woven throughout our courses at Louise Anne Designs.

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