Crib 5 Testing: What It Is, Why It Matters & When You Need It

The final performance can depend on the complete upholstery combination, including the face fabric, filling materials, construction, and intended end use.

And when projects move into environments with more demanding fire-performance requirements, one test you may encounter is Crib 5.

But what exactly is Crib 5 testing? Why is it called “Crib 5”? And how do you know when your upholstery needs to meet it?

Let’s break it down.

Unlike tests that use a cigarette or small flame as the ignition source, Source 5 testing introduces a significantly greater ignition challenge using a specifically constructed wooden crib.

The test helps evaluate how an upholstered seating combination responds when exposed to this more demanding ignition source.

And that’s an important distinction:

Crib 5 isn’t simply a test of a piece of fabric.

The performance of an upholstered assembly can be influenced by the interaction between its different components. That’s why understanding the construction and intended application is an important part of determining the appropriate testing approach.

The small wooden sticks are arranged in layers to create a structure resembling a miniature crib. When ignited, the crib produces a more substantial fire challenge than the smaller ignition sources used at lower testing levels.

This allows the laboratory to evaluate how the upholstery combination performs under a more demanding ignition scenario.

For example, low-hazard environments can include:

• Offices
• Schools
• Universities
• Colleges
• Museums
• Exhibitions
• Day centers

These applications generally require cigarette and match ignition resistance, although a higher performance level may be needed when a space is used for sleeping.

However, as you move into medium-hazard environments, the requirements increase.

These environments can include:

• Hotels and hotel bedrooms
• Hospitals
• Restaurants
• Bars and public houses
• Casinos
• Hostels
• Public buildings
• Public halls
• Places of public entertainment

This is where understanding the project’s intended end use becomes especially important.

Rather than assuming a textile needs a particular test, the first step should be identifying the applicable performance requirement for the environment where the upholstered product will ultimately be used.

Requirements should always be confirmed for the specific project,
occupancy, location, and specifying authority.

Different components can interact differently when exposed to heat and flame.

That’s why testing provides something assumptions can’t:

Real performance data.

At Applied Lab, we evaluate textile and upholstery combinations against application-specific requirements so manufacturers, designers, suppliers, and other project stakeholders can make decisions based on actual test results.

Common U.S. upholstery requirements such as CAL TB 117 and NFPA 260 use a smoldering cigarette as the ignition source.

Crib 5 introduces a substantially more severe flaming ignition source.

And there’s another important consideration:

You’re not simply testing a piece of fabric. You’re evaluating an upholstery combination.

The cover fabric, foam, backing, interliner, and other components can influence how the assembly performs.

For BS 5852 Source 5 testing, the material is evaluated over filling material meeting the applicable BS 7176 requirements, typically combustion-modified high-resilience (CMHR) foam.

When a fire-retardant treatment is used, water soaking is also required as part of the test preparation.

To meet the Source 5 requirements, the upholstery assembly cannot exhibit unsafe escalating combustion or progressive smoldering and must remain within specified flaming and smoldering limits.

That’s a very different challenge from a cigarette ignition test.

A fabric that performs successfully against a smoldering cigarette ignition source may respond very differently when exposed to the more severe flaming ignition source used for Crib 5 testing.

We’re seeing textile companies with great fabrics and real opportunities in the contract market struggle to achieve the required Crib 5 performance.

A mill may have a collection that has historically been successful in residential applications.

Then a hospitality designer wants to specify it for a hotel.

A distributor sees an opportunity in the UK.

A manufacturer wants to use it on seating for an international project.

Suddenly, Crib 5 becomes part of the conversation.

And when that upholstery combination doesn’t perform as required, the consequences can extend far beyond a failed laboratory report.

It can mean a lost specification.

A delayed project.

Another round of development and testing.

A designer being forced to substitute a fabric they originally loved.

Or an entire collection remaining limited to markets where less stringent fire performance is required.

Applied Textiles has spent more than 35 years engineering textiles to perform for their intended environments. And as they’ve worked with customers pursuing international and contract opportunities, they’ve seen the Crib 5 challenge become increasingly common.

So, they approached it the way they approach any textile performance problem.

They engineered for it.

Their team evaluated how different textiles responded to Crib 5 requirements, considering factors such as fiber content, construction, backing, and processing.

We tested.

They adjusted.

We tested again.

From that work, they’ve developed an Alta™ fire-performance solution engineered to help customers overcome Crib 5 challenges.

That’s where Applied Lab comes in.

We can evaluate the textile and its construction, understand the intended market and applicable performance requirements, engineer the textile accordingly, and test the resulting upholstery combination.

This process helps replace uncertainty with something far more useful:

Confidence.

Confidence that the appropriate requirement has been identified.

Confidence that the right test has been selected.

And confidence backed by actual laboratory data, not assumptions.

A material may already have been specified. Furniture may be moving toward production. Project deadlines may be approaching.

Testing earlier gives project teams an opportunity to understand performance before those decisions become more difficult—or more expensive—to change.

For projects involving unfamiliar constructions, new textile combinations, or more demanding fire-performance requirements, early testing can provide valuable information before moving forward.

You shouldn’t have to guess which requirement applies or whether an upholstery combination will perform as expected.

Applied Lab can help identify the appropriate testing pathway and provide the data you need to move forward with confidence.