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Item # LD32CN, Low Density Polyethylene

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The Azote brand products comprise a range of cross linked, closed cell foams, physically blown using pure nitrogen gas, and sold under the trade marks Plastazote®, Evazote®, Propozote® and Supazote®. All grades are thermoformable, though the degree of detail and complexity of moulding possible will vary between grades.

The Azote brand products are manufactured and sold as essentially rectangular sheets (sometimes known as buns or blocks) in a range of sizes, all having process skin surfaces. Talc residues or other processing aids may be present on the skin surfaces.

Specifications  · Void Level  · Product Size  · Product Properties  · Product Appearance  · Variants on the Foams



Plastazote Foam


32 kg/m³

Min. Sheet Density

28 kg/m³

Max. Sheet Density

39 kg/m³

Min. Cell Size

0.6 mm

Max. Cell Size

1.3 mm

Void Category



Low Density Polyethylene

Special Properties

Electrically Conductive




Void Level

1mm< D <2mm [No./m2]


2mm< D <4mm [Σ(D)3/m2]d


4mm< D <5mm [No./15m2]


Product Size
  • Sheets [Test method: ISO 1923:1995]
    Sheet sizes are defined by length, width and thickness. Nominal dimensions are the dimensions specified on the acknowledgement of order. For skin/skin sheets nominal dimensions (process skins are considered an integral part of the sheet) are the minimum dimensions and will always be met or exceeded. For cell/cell and skin/cell tolerances see Fabricated Items below.

    A skin/skin sheet showing any surface fault or defect is considered to be in specification providing that a specification cell/cell sheet of nominal/minimum dimensions and thickness 3 mm less than the nominal/minimum sheet thickness can be obtained (e.g. a 2000 mm x 1000 mm x 27 mm specification cell/cell sheet shall be obtainable from nominal 2000 mm x 1000 mm x 30 mm skin/skin sheet).

  • Fabricated Items [Test method: ISO 1923:1995]
    Fabrication tolerances are shown in Tables 5, 6 & 7 of TIS01.

Product Properties
  • Density [Test method: BS ISO 7214:1998]
    Foam densities are measured with process skins intact unless otherwise stated. The density range applies irrespective of foam sheet size or color.

  • Mechanical Properties [Test method: Table 4 (TIS01) &/or Technical Data Sheets]
    Technical data sheets are published listing a range of property values relating to Zotefoams Azote brand foam products. The data sheet property values are typical of the material and are intended to provide guidance to customers; they do not constitute a specification and should not be used for specification development. The data sheet property values however, in combination with details given in Table 4 (TIS01) do give the expected range of product properties.

    Certain grades are produced with crosslink levels significantly different from standard, in order to provide special properties (such as enhanced thermoformability or enhanced resilience). Such grades may deviate more substantially from data sheet indications - all necessary specification requirements for these products should be made and agreed in writing with Zotefoams pic Quality Assurance Department.

  • Thermoformability [Test method: Zotefoams lnternal]
    The test involves compression moulding of a 28 mm thick piece of foam into a test mould having areas of different depth/width moulding (draw) ratios. Details of the test mould can be provided on request. Products with nominal densities of 29 kg/m3 or less and conductive/static dissipative grades are typically thermoformable to a draw ratio 1:1.5 without losing structural integrity, e.g. by surface tearing. All other grades are typically thermoformable to a draw ratio of 1:2.5 and above.
Note: Thermoformability is affected by many variables and under optimum moulding conditions thermoformability beyond these draw (depth:width) ratios may be achieved by specialists in the foam moulding field.

Product Appearance
  • Voids [Test Method: Zotefoams lnternal]
    The method takes into account the perceived seriousness of the void in so much as small voids (1 mm to 2 mm diameter) are assessed by physical count of an area of a square meter, medium sized voids (2 mm to 4 mm diameter) are counted and then the sum of the cube of all the diameters is quoted per square metre (i.e. one 3 mm diameter void in 1 m2 = 27). Large voids (4+ mm in diameter) are physically counted over an extended area of 15m2.

    The above are arranged into void categories and these categories are quoted for the different grades in Tables 1 and 2 (TIS01). The category description and the void levels these represent are given in Table 3 (TIS01).

  • Cell Size [Test method: Zotefoams lnternal]
    Cell size ranges by product are given in Table 1 (TIS01).

  • Color [Test method: Zotefoams lnternal]
    The color shall be essentially visually uniform within the foam structure of a sheet. However, variation may be found between production Lots and/or individual sheets. The colour appearance of product will be affected by cell size; for the same colour product, larger cell size appears darker, smaller cell size appears lighter. Perceived colour will therefore be affected by the cell size ranges in Table 1 (TIS01).

  • Surface Condition [Test method: Zotefoams lnternal]
    The products as manufactured will normally show an embossed pattern on one process skin surface. All process skins may occasionally have slight surface marks, indentations or discolouration. Talc residues, water, other processing aids or paint marks used by Zotefoams pic during manufactuer may be present on the skin surfaces and/or edges. No guarantee is offered in relation to the skin surface.

  • Internal Condition [Test method: Zotefoams lnternal]
    The products as manufactured may show internal patterns and markings within the cellular structure. Such appearance faults may be very subtle and would not normally affect foam performance.

  • Sheet Flatness [Test method: Zotefoams lnternal]
    When sheets are split some waviness may occur at the edges of the sheet. The amplitude and frequency is dependent on the thickness of the split sheet, the original sheet thickness, the product density and the process history of the sheet. Typically a 6 mm thick split from a 30 mm flat sheet would be expected to have 1.5 to 2.5 waves along its length. These would be more frequent with a 50 mm thick sheet and less frequent with 15 mm splits or for trimmed sheets. This waviness would not normally affect the sheet performance and may be further alleviated by trimming of the product prior to splitting through the thickness - note that minimum size specifications detailed earlier will apply.

  • Distortion [Test method: Zotefoams Internal]
    Distortion is the maximum curvature of a sheet and is the measured difference between the apparent thickness over the curvature and the actual thickness of the sheet. Distortion is measured using a standard measuring table and for all skin/skin sheets, except HD and HL grades, shall be no more than 20 mm. For HD and HL grades the maximum distortion shall be no more than 30 mm.

Variants on the Foams
  • Colors
  • Conductives & Static Dissipative
  • Flame Retardant
  • Cell sizes
    • Fine Cell
    • Medium Cell
    • Large Cell
  • Crosslink Levels


·  Density Conversion

·  Material Characteristics


TIS01 Product Specification
(PDF, 4421KB)

TIS02 Health and Safety Information
(PDF, 531KB)

TIS03 Quality
(PDF, 385KB)

TIS04 Environmental Perspective
(PDF, 579KB)

TIS05 Summary of Specifications
(PDF, 350KB)

TIS06 Chemical Resistance
(PDF, 323KB)

TIS07 Flexural Properties
(PDF, 194KB)

TIS08 Thermal Stability
(PDF, 325KB)

TIS09 Energy Absorption Capacity
(PDF, 171KB)

TIS10 Thermal Conductivity
(PDF, 258KB)

TIS11 Behavior in Fires
(PDF, 345KB)

TIS12 Compliance with Fire and Flammability standards
(PDF, 349KB)

TIS13 Weathering
(PDF, 282KB)

TIS14 Compliance with Automotive Standards
(PDF, 359KB)

TIS15 Adhesive Bonding
(PDF, 733KB)

TIS16 Conductive Foams
(PDF, 269KB)

TIS17 Static Dissipative Foams
(PDF, 278KB)

TIS18 Use with ESD Sensitive Devices
(PDF, 293KB)

TIS19 Compliance with Standards for Toy Safety
(PDF, 267KB)

TIS20 Toxicity Testing
(PDF, 280KB)

TIS21 Compliance with Buoyancy Standards and Specifications
(PDF, 310KB)

TIS22 Advice for Splitting and Slicing
(PDF, 225KB)

TIS23 Advice for Thermoforming
(PDF, 303KB)

TIS24 Cleaning, Disinfecting and Sterilisation
(PDF, 363KB)

TIS25 Compliance with Standards for Medical Applications
(PDF, 401KB)

TIS26 Recycling and Reuse
(PDF, 306KB)

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Registered office: 675 Mitcham Road, Croydon CR9 3AL