What Is Sanforisation? Sanforised and Sanforising Explained for Interior Designers

What Is Sanforisation? Sanforised and Sanforising Explained for Interior Designers

What it is: A mechanical pre-shrinking finishing process applied to woven fabric before it leaves the mill. Named after Sanford Lockwood Cluett, who patented the process in 1930.
Which fabrics: Most commonly applied to cotton and linen. Also used on some cotton-blend upholstery and shirting fabrics.
Why it matters: Fabric that has not been sanforised may shrink when used in curtains or upholstery that are subsequently washed or exposed to moisture. Sanforised fabric has been pre-shrunk to defined limits at the mill, reducing but not eliminating subsequent shrinkage.
On the label: Sanforised is a registered trademark. Fabric labelled Sanforised has been tested and certified to shrink no more than 1% in either direction. Sanforised-Plus is the rating for fabrics with even greater dimensional stability.

Sanforising is a mechanical finishing process applied to woven fabric to reduce the shrinkage that would otherwise occur when the fabric is exposed to moisture or heat after making up. Interior designers encounter the term on fabric data sheets and labels, most commonly on cotton and linen upholstery and curtain fabrics. Understanding what it means and what it does not guarantee is a practical specification consideration.


How the Process Works

Sanforising passes the woven fabric through a machine that compresses it mechanically in the warp direction — along the length of the fabric. A rubber blanket is stretched and then released, and the fabric is carried through this process so that the yarns are forced into a more compact arrangement in the warp direction before they are set by steam. The result is a fabric whose yarns have already been displaced into the position they would naturally move to if the fabric were washed. When the finished curtain or upholstered piece is subsequently washed or exposed to moisture, the fabric has less remaining tendency to shrink because the displacement has already occurred.

The process addresses warp shrinkage — shrinkage along the length of the fabric. Weft shrinkage — shrinkage across the width — is controlled by a separate process called tentering, in which the fabric is held to a defined width during drying and heat setting. Sanforised fabric has typically been through both processes.


What Sanforised Means on a Label

Sanforised is a registered trademark owned by Cluett, Peabody and Co. Fabric carrying the Sanforised mark has been independently tested and certified to shrink no more than 1% in either the warp or weft direction when washed. This is the residual shrinkage after the sanforising process — fabric may still shrink by up to 1% in each direction, but no more.

Sanforised-Plus is a higher standard, certifying residual shrinkage of no more than 0.5% in either direction. It appears on some high-quality cotton fabrics and performance linens.

Fabric described as pre-shrunk rather than Sanforised may have been through a similar mechanical process but without independent certification to the same standard. The level of residual shrinkage permitted under a pre-shrunk claim is not standardised.


What It Does Not Guarantee

Sanforised certification applies to shrinkage caused by washing. It does not address all the dimensional changes that fabric may undergo in use. Natural fibre fabrics — cotton and linen in particular — absorb and release atmospheric moisture as humidity changes. This hygroscopic behaviour causes minor dimensional changes that are distinct from washing shrinkage and are not addressed by sanforising. In environments with significant humidity variation — a room that alternates between very dry and very damp conditions — even sanforised linen or cotton may show minor dimensional change over time.

Sanforised certification also does not address the relaxation shrinkage that may occur in curtains hung under their own weight over time, particularly in heavy cotton or linen fabrics. This is a tension-release effect rather than a moisture-induced shrinkage and is unrelated to the sanforising process.


Relevance for Upholstery Specification

For upholstery fabrics that will not be washed — most contract upholstery is dry-clean or spot-clean only — sanforised certification has limited direct relevance to the face fabric performance. Where it matters most is in curtain fabrics that will be laundered, and in loose covers and cushion covers in domestic settings where machine washing is planned.

For linen upholstery fabrics, the dimensional stability of the fabric during making-up is more practically significant than its washing shrinkage. A fabric that relaxes or distorts during the tension applied in upholstery construction will affect the alignment of the finished piece regardless of its sanforised status. Confirm dimensional stability under tension with the supplier for any linen or cotton fabric being used in tight upholstery applications.


For linen upholstery fabric specification, see our upholstery linen page. For fabric care and cleaning codes, see our fabric care symbols guide. For fabric hand and how natural fibres behave in use, see our fabric hand and tactile properties guide.

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Velvet

Velvets have become increasingly popular over the last 5 years. Both residential and contract usage of velvets have increased tremendously. Having been produced for hundreds of years velvets never seem to have lost the attention of discerning designers.

Interior Designers are often interested in the properties and manufacture of velvet – the two being necessarily related. The depth of the pile, the durability of the finish, the ease of maintaining the beautiful finish.

Velvet is made in one of two ways – cut or uncut:

1. Cut pile

a. Here the loom is configured to Continue reading “Velvet”

What are the finest yacht linens?

The world’s most luxurious linens are feted by business leaders, top entertainers and royalty the world over. They are found extensively in the villas, yachts and chalets that few are rarely are privileged to see.

Quality, excellence by the use of the finest natural fibres and craftsmanship establish and maintain the leading linen companies’ reputations in that market.

KOTHEA’s unmistakeable handwoven linens continue to set the highest standards for the competition to follow.

Cashmere throws – bespoke / custom sizes

To supplement our range of coloured cashmere throws (147 x 183 cm), we now have the ability to weave 100% cashmere throws in any size up to a maximum width of 220cm in off-white and natural colours.

Our hand woven linen throws (pictured) can also be woven in bespoke dimensions, to order.

Martindale Rub Count Thresholds for Hotel and Restaurant Upholstery

For guidance on Martindale rub count thresholds for hotel and restaurant upholstery — including recommended rub counts by room type and how to specify for contract environments — see our complete guide: Hotel Fabric Specification Guide: Martindale, Crib 5, Cleaning and Dye Lots.

For the Martindale rub test explained in full, see our Martindale rub test guide. For Crib 5 fire certification for contract upholstery, see our Crib 5 guide.

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Sheer Fabrics & The Rub Test

Kothea was recently asked: do sheer fabrics have a rub test?

The Martindale rub test is an abrasion test. It mimics the wear a fabric experiences when used on upholstered seating. Any fabric can be put through the test procedure.

Sheer fabrics are used for curtains and blinds, not for upholstery. So the answer is no. A rub test is not relevant to sheer fabrics because they are not used on sofas.

For sheer fabrics and contract curtains the most important performance test is for flame retardancy. If you need guidance on fire rating standards for curtain fabrics, contact Kothea directly.

Textile Performance Guidelines (USA Only)

ACT is the acronym for Association for Contract Textiles, which is a not-for-profit trade organization made up primarily of the companies that supply textiles to the contract interior design industry.

The ACT Textile Performance Guidelines

In order to make textile specification easier, ACT member companies adopted a body of popular tests that measure important performance criteria for textiles in the contract interior textiles market. The results of these specific tests are represented by graphic symbols, which are used on ACT-member company textile sampling to indicate that a specific textile performs to contract standards for its recommended application.

The Guidelines are a selection of the numerous tests for textile performance that have been established (and are periodically reviewed) by standards organizations, such as ASTM (American Society for Testing and Materials: www.astm.org) and AATCC (American Association of Textile Chemists and Colorists: www.aatcc.org).

ACT has developed the following voluntary Performance Guidelines to make textile specification easier. The 5 symbols give architects, designers, and end-users a vast amount of performance information in a succinct visual way. Look for these symbols on INSTYLE CONTRACT TEXTILE sampling to assure that the textiles you specify perform to contract standards and pass all applicable testing.

These categories describe a textile’s performance features as measured by specified methods under standard laboratory conditions.’


Flammability

The measurement of a fabric’s performance when it is exposed to specific sources of ignition.
Note: ACT guidelines specify different flammability tests dictated by the intended end use for the fabric.

ACT Guidelines
Upholstery
California Technical Bulletin #117 Section E – Class 1 (Pass)

Direct Glue Wallcoverings
ASTM E 84-03 (Adhered Mounting Method) – Class A or Class 1

Wrapped Panels and Upholstered Walls
ASTM E 84-03 (Unadhered Mounting Method) – Class A or Class 1

Drapery
NFPA 701-89 (Small Scale)* – Pass* NFPA 701-99 Test #1 is being phased in at this time, but is not yet cited in all relevant codes. Therefore, the small-scale test remains the ACT standard until further notice.

TEST METHODS
California Technical Bulletin #117
Section E* – Class 1 (Pass)

The California TB #117 Section E is a test method of the California Bureau of Home Furnishings and Thermal Insulation. It is a vertical flame test measuring the ease of ignition and the burning rate when a small open flame hits the surface of the test fabric for 1 second. A Class 1 (Pass) rating is assigned if:

1. A 5.0 inch section of the fabric is consumed in 3.5 or more seconds (less than 3.5 seconds is a failure). For raised surface fabric, the minimum burn time is increased to 4.0 seconds.

2. An average char length of less than 6.5 inches or an individual specimen over 7.5 inches.

* For complete technical details about California Bulletin #117 Section E:
https://www.bhfti.ca.gov/techbulletin/117.pdf

ASTM E 84-03* Tunnel Test
The ASTM E-84 test is a test method of the American Society for Testing and Materials (ASTM). Commonly called the Tunnel Test, this test can be performed under two different methods adhered or non adhered where the only difference is in specimen preparation:

Adhered: The fabric is bonded to either a CA board substitute or gypsum board. This is the prescribed method for wall coverings whose actual use will be adhered .

Non adhered: If the fabric is a panel fabric or upholstered walls, it is tested in a frame without being bonded to any other material.

In each instance (adhered and non adhered), the fabric is placed in the ceiling of the test tunnel and subjected at one end to a high intensity flame which spreads over the first 4.5 feet of the 24 foot test specimen.

The distance of flame front progression and total burning time are used to calculate a flame spread index. Smoke monitors are used to calculate a smoke developed value. The flame spread index and smoke developed value are calculated from the results of the test fabric compared to the characteristics of cement board and red oak materials resulting in the indexes.

Typically, the code classes are as follows:
Class A: Flame Spread Index of 25 or less and Smoke Developed value of 450 or less
Class B: Flame Spread Index of 26 to 75 and Smoke Developed value of 450 or less
Class C: Flame Spread Index of 76 to 200 and Smoke Developed value of 450 or less

Caution: The ASTM E 84 test is only valid if the textile or vinyl wall covering is used in a sprinklered occupancy. If not, the Room Corner Test (NFPA 265 for textiles; and NFPA 286 for vinyl) is mandated in many jurisdictions.

* For complete technical details about ASTM E 84-03: https://www.astm.org

NFPA 701-89 (Small Scale)*
The NFPA 701-89 (Small Scale) is a test method of the National Fire Protection Agency. It measures the ignition resistance of a fabric after it is exposed to a flame for 12 seconds. The flame, char length and flaming residue are recorded. The fabric will pass the test if all samples meet the following criteria (if one sample fails the fabric fails):

1) an after flame of less then 2.0 seconds

2) a char length of less then 6.5

3) the specimen does not continue to flame after reaching the floor of the test chamber

Note: NFPA 701-99 Test #1 is being phased in at this time, but is not yet cited in all relevant codes. Therefore, the small-scale test remains the ACT standard until further notice.

* For complete technical details about NFPA 701: https://www.nfpa.org

Revised October 2003


Wet & Dry Crocking

Transfer of dye from the surface of a dyed or printed fabric onto another surface by rubbing.

ACT GUIDELINES
Upholstery

AATCC 8-2001
Dry Crocking, Grade 4 minimum.
Wet Crocking, Grade 3 minimum.

Direct Glue Wallcovering
AATCC 8-2001
Dry Crocking, Grade 3 minimum.
Wet Crocking, Grade 3 minimum.

Wrapped Panels & Upholstered Walls
AATCC 8-2001
Dry Crocking, Grade 3 minimum.
Wet Crocking, Grade 3 minimum.

Drapery
AATCC 8-2001 (Solids)
Dry Crocking, Grade 3 minimum.
Wet Crocking, Grade 3 minimum.

AATCC 16-2001 (Prints)
Dry Crocking, Grade 3 minimum.
Wet Crocking, Grade 3 minimum.

TEST METHODS
AATCC 8-2001*

The AATCC 8-2001 is a test method of the American Association of Textile Chemists and Colorists (AATCC). This method uses a standard white cotton fabric that is rubbed against the surface of the test fabric. To test for wet crocking the standard fabric is wet before rubbing against the test fabric. After rubbing under controlled pressure for a specific number of times the amount of color transferred to the white test squares is compared to an AATCC color chart and a rating is established.

Grade 5 = no color transfer
Grade 1 = high degree of color transfer

* For complete technical details about AATCC 8: https://www.aatcc.org

AATCC 116-2001*
The AATCC 116-2001 is a test method of the American Association of Textile Chemists and Colorists (AATCC). This test is specifically used for printed fabrics that do not lend themselves to the AATCC 8-2001 method. The test fabric is held at the base of a Rotary Vertical Crockmeter and rubbed with a standard cotton white fabric either dry or wet. After rubbing under controlled pressure for a specific number of times the amount of color transferred to the white test squares is compared to an AATCC color chart and a rating is established.

* For complete technical details about AATCC 116: https://www.aatcc.org

Revised October 2003


Colorfastness to Light

A material’s degree of resistance to the fading effect of light.

ACT GUIDELINES
Upholstery

AATCC 16 Option 1 or 3-2003 Grade 4 minimum at 40 hours

Direct Glue Wallcoverings
AATCC 16 Option 1 or 3-2003 Grade 4 minimum at 40 hours

Wrapped Panels and Upholstered Walls
AATCC 16 Option 1 or 3-2003 Grade 4 minimum at 40 hours

Drapery
AATCC 16 Option 1 or 3-2003 Grade 4 minimum at 60 hours

TEST METHOD
AATCC 16 Option 1 or 3 – 2003*

The AATCC 16 Option 1 and 3 are test methods of the American Association of Textile Chemists and Colorists (AATCC). ACT recognizes both methods where the only difference is the light source being used. In AATCC 16 Option 1 a Carbon-Arc lamp is used as the light source and in AATCC 16 Option 3 a Xenon-Arc lamp is used. Under both methods a strip of fabric (part of which is protected by a special paper card) is placed in a fadometer and exposed to 40 hours of accelerated fading units (AFU). After the exposure the difference in color between the exposed and protected parts of the fabric are compared to the AATCC gray scale and the degree of fading is rated.

Grade 5 = no fading
Grade 4 = slight fading
Grade 1 = high degree of fading

* For complete technical details about AATCC 16 Option 1 or 3 – 2003: https://www.aatcc.org

Revised October 2003


Physical Properties

Physical property tests include: Brush Pill, Breaking Strength and Seam Slippage. Pilling is the formation of fuzzy balls of fiber on the surface of a fabric that remain attached to the fabric. Breaking strength is the measurement of stress exerted to pull a fabric apart under tension. Seam Slippage is the movement of yarns in a fabric that occurs when it is pulled apart at a seam.

ACT GUIDELINES
Upholstery

Brush pill
ASTM D3511-02, Class 3 minimum

Breaking strength
ASTM D5034-95 (2001) (Grab Test)
50 lbs. minimum in warp and weft

Seam slippage
ASTM D3597-02-D434-95
25 lbs. minimum in warp and weft

Wrapped Panels and Upholstered Walls
Breaking strength
ASTM D5034-95 (2001) (Grab Test)
35 lbs. minimum in warp and weft

Seam slippage
ASTM D3597-02-D434-95
25 lbs. minimum in warp and weft

Drapery
Seam slippage
ASTM D3597-02-D434-95
for fabrics under 6 oz./sq. yard
15 lbs. minimum in warp and weft

Seam slippage
ASTM D3597-02-D434-95
for fabrics over 6 oz./sq. yard
25 lbs. minimum in warp and weft

TEST METHODS
ASTM D3511-02*

The ASTM D3511-02 is a test method of the American Society of Testing and Materials (ASTM). This test utilizes nylon bristles to rub the surface of the test fabric for a specific amount of time. The number of pill balls are counted and given a 1 – 5 rating.

Class 5 = no pilling
Class 1 = severe pilling

* For complete technical details about ASTM D3511: https://www.astm.org

ASTM D5034-95 (2001) (Grab Test)*
The ASTM D5034-95 (2001) (Grab Test) is a test method of the American Society of Testing and Materials (ASTM). To evaluate, the fabric being tested is put into a machine that grips the fabric with two clamps. One clamp is stationary and the other moves away applying tension until the fabric breaks or ruptures. This test is performed in both the warp and weft directions. The number of pounds required to cause a fabric to break or rupture determines the rating.

* For complete technical details about ASTM D5034-95 (2001) (Grab Test): https://www.astm.org

ASTM D3597-02-D434-95*
The ASTM D3597-02-D434 is a test method of the American Society of Testing and Materials (ASTM). To measure a fabric’s ability to resist seam slippage, a seam is sewn in the test fabric using a standard thread, specific seam allowance and specific number of stitches per inch. The sewn fabric is then clamped at opposing side of the seam. One clamp is moved away from the other applying tension at the sewn seam. This test is performed in both the warp and filling directions. The tension is increased until the seam separates to a specific distance. The number of pounds required to cause separation due to yarn slippage determines the rating.

* For complete technical details about ASTM D3597-02-D434-95: https://www.astm.org

Revised October 2003


Abrasion

The surface wear of a fabric caused by rubbing and contact with another fabric.

ACT GUIDELINES
General Contract Upholstery

ASTM D4157-02 (ACT approved #10 Cotton Duck)
15,000 double rubs Wyzenbeek method

ASTM D4966-98 (12 KPa pressure)
20,000 cycles Martindale method

Heavy Duty
ASTM D4157-02 (ACT approved #10 Cotton Duck)
30,000 double rubs Wyzenbeek method

ASTM D4966-98 (12 KPa pressure)
40,000 cycles Martindale method

End use examples of heavy-duty installations where upholstery fabrics rated at 30,000 double rubs should be appropriate are single shift corporate, hotel rooms/suites, conference rooms and dining area usage.

ACT acknowledges that there are extreme wear situations that may require higher levels of abrasion resistance. End use examples that may require higher than 30,000 double rubs include: 24 hours transportation terminals, 24 hour telemarketing, 24 hour healthcare emergency rooms, 24 hour casino gambling areas, and such public gathering places as theatres, stadiums, lecture halls and fast food restaurants.

It is strongly suggested that double rubs exceeding 100,000 are not meaningful in providing additional value in use. Higher abrasion resistance does not necessarily indicate a significant extension of the service life of the fabric.

The Wyzenbeek and Martindale tests are the two methods commonly used to predict wear-ability. Actual performance is determined by many factors such as fiber content, weaves, finishes, furniture design, maintenance, cleaning, and usage. Durability of an upholstery fabric is a complex interaction (combination) of a number of performance tests that, in addition to abrasion, includes seam slippage, pilling, tensile strength, and usage.

There is no correlation between the Wyzenbeek and Martindale tests so it is not possible to estimate the number of cycles that would be achieved on one test if the results from the other test were known.

TEST METHODS
ASTM D4157-02**

Oscillatory Cylinder (Wyzenbeek)
The ASTM D4157-02 is a test of the American Society of Testing and Materials. A Wyzenbeek machine is used for this test allowing samples of the test fabric to be pulled tight in a frame and held stationary. Individual test specimens cut from the warp and weft direction are then rubbed back and forth using an ACT approved #10 cotton duck fabric* as the abradant. The number of double rub cycles achieved before two yarn breaks occur or noticeable wear is observed is recorded as the fabric s abrasion rating.

** For complete technical details about ASTM D4157-02: https://www.astm.org

* The wire screen abradant is recommended by ACT for use with vinyl and polyurethane coated upholstery and may also be used for testing 100% olefin fabrics.

ASTM D4966-98* Martindale
The ASTM D4966-98 is a test method of the American Society of Testing and Materials (ASTM). This is an oscillating test. Fabric samples are mounted flat and rubbed in a figure eight like motion using a piece of worsted wool cloth as the abradant. The number of cycles that the fabric can endure before fabric shows objectionable change in appearance (yarn breaks, pilling, holes) is counted. Number of cycles determines abrasion rating.

Source: Association for Contract Textiles

Colourfastness – Testing to US standards

Colorfastness to Light

A material’s degree of resistance to the fading effect of light.

ACT GUIDELINES (USA :: Association for Contract Textiles)

Upholstery
AATCC 16 Option 1 or 3-2003 Grade 4 minimum
at 40 hours

Direct Glue Wallcoverings
AATCC 16 Option 1 or 3-2003 Grade 4 minimum
at 40 hours

Wrapped Panels and Upholstered Walls
AATCC 16 Option 1 or 3-2003 Grade 4 minimum
at 40 hours

Drapery
AATCC 16 Option 1 or 3-2003 Grade 4 minimum
at 60 hours

QuickTime Movies (click link to play)
Colorfastness to light

TEST METHOD
AATCC 16 Option 1 or 3 – 2003*
The AATCC 16 Option 1 and 3 are test methods of the American Association of Textile Chemists and Colorists (AATCC). ACT recognizes both methods where the only difference is the light source being used. In AATCC 16 Option 1 a Carbon-Arc lamp is used as the light source and in AATCC 16 Option 3 a Xenon-Arc lamp is used. Under both methods a strip of fabric (part of which is protected by a special paper card) is placed in a fadometer and exposed to 40 hours of accelerated fading units (AFU). After the exposure the difference in color between the exposed and protected parts of the fabric are compared to the AATCC gray scale and the degree of fading is rated.

Grade 5 = no fading
Grade 4 = slight fading
Grade 1 = high degree of fading

* For complete technical details about AATCC 16 Option 1 or 3 – 2003: https://www.aatcc.org

Source: Association for contract textiles (USA)

What is wet (or dry) crocking in relation to fabric?

What Is Crocking? Wet and Dry Crocking on Fabrics Explained

Crocking is the transfer of dye from the surface of a dyed or printed fabric onto another surface by rubbing. Wet crocking occurs when the fabric is damp or wet; dry crocking occurs when the fabric is dry. Wet crocking is almost always more severe than dry crocking because moisture mobilises dye molecules that would otherwise remain fixed.

Crocking is tested to ISO 105-X12 using a standard rubbing cloth that is pressed against the fabric sample and rubbed a defined number of times under controlled pressure. The degree of colour transferred to the rubbing cloth is assessed against the Grey Scale, with 5 indicating no transfer and 1 indicating severe transfer. Contract upholstery fabrics should achieve a minimum of grade 4 dry and grade 3 wet to be acceptable for general use.

For a complete guide to crocking, colour fastness testing, and what the grades mean for specification, see our colour fastness and crocking guide. For dye types and how they affect crocking risk, see our dye types guide.

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Match & Cigarette Tests :: Equivalents in USA

Flammability


The measurement of a fabric’s performance when it is exposed to specific sources of ignition.

Note: Association of Contract Textiles (ACT) guidelines specify different flammability tests dictated by the intended end use for the fabric.

Association of Contract Textiles
Guidelines

Upholstery
California Technical Bulletin #117 Section E –
Class 1 (Pass)

Direct Glue Wallcoverings
ASTM E 84-03 (Adhered Mounting Method) –
Class A or Class 1

Wrapped Panels and Upholstered Walls
ASTM E 84-03 (Unadhered Mounting Method) –
Class A or Class 1

Drapery
NFPA 701-89 (Small Scale)* – Pass*NFPA 701-99 Test #1 is being phased in at this time, but is not yet cited in all relevant codes. Therefore, the small-scale test remains the ACT standard until further notice.

QuickTime Movies (click links to play)NFPA 701-99 (Small Scale) California TB #117 Section E

TEST METHODS
California Technical Bulletin #117
Section E* – Class 1 (Pass)
The California TB #117 Section E is a test method of the California Bureau of Home Furnishings and Thermal Insulation. It is a vertical flame test measuring the ease of ignition and the burning rate when a small open flame hits the surface of the test fabric for 1 second. A Class 1 (Pass) rating is assigned if:

1. A 5.0″ section of the fabric is consumed in 3.5 or more seconds (less than 3.5 seconds is a failure). For raised surface fabric, the minimum burn time is increased to 4.0 seconds.

2. The fabric does not ignite.

* For complete technical details about California Bulletin #117 Section E: https://www.bhfti.ca.gov/techbulletin/117.pdf

ASTM E 84-03* Tunnel Test
The ASTM E-84 test is a test method of the American Society for Testing and Materials (ASTM). Commonly called the Tunnel Test, this test can be performed under two different methods adhered or non adhered where the only difference is in specimen preparation:

Adhered: The fabric is bonded to either a CA board substitute or gypsum board. This is the prescribed method for wall coverings whose actual use will be adhered .

Non adhered: If the fabric is a panel fabric or upholstered walls, it is tested in a frame without being bonded to any other material.

In each instance (adhered and non adhered), the fabric is placed in the ceiling of the test tunnel and subjected at one end to a high intensity flame which spreads over the first 4.5 feet of the 24 foot test specimen.

The distance of flame front progression and total burning time are used to calculate a flame spread index . Smoke monitors are used to calculate a smoke developed value. The flame spread index and smoke developed value are calculated from the results of the test fabric compared to the characteristics of cement board and red oak materials resulting in the indexes.

Typically, the code classes are as follows:

Class A: Flame Spread Index of 25 or less and Smoke Developed value of 450 or less

Class B: Flame Spread Index of 26 to 75 and Smoke Developed value of 450 or less

Class C: Flame Spread Index of 76 to 200 and Smoke Developed value of 450 or less

Caution: The ASTM E 84 test is only valid if the textile or vinyl wall covering is used in a sprinklered occupancy. If not, the Room Corner Test (NFPA 265 for textiles; and NFPA 286 for vinyl) is mandated in many jurisdictions.

* For complete technical details about ASTM E 84-03: https://www.astm.org

NFPA 701-89 (Small Scale)*
The NFPA 701-89 (Small Scale) is a test method of the National Fire Protection Agency. It measures the ignition resistance of a fabric after it is exposed to a flame for 12 seconds. The flame, char length and flaming residue are recorded. The fabric will pass the test if all samples meet the following criteria (if one sample fails the fabric fails):

1) An after flame of less then 2.0 seconds

2) An average char length of less than 6.5″ or an individual specimen of 7.5″.

3) The specimen does not continue to flame after reaching the floor of the test chamber

Note: NFPA 701-99 Test #1 is being phased in at this time, but is not yet cited in all relevant codes. Therefore, the small-scale test remains the ACT standard until further notice.

* For complete technical details about NFPA 701: https://www.nfpa.org

Revised October 2003:

Source: Association For Contract Textiles