The “Ford WSS-M4D815 Polypropylene (PP) foam, closed cell” standard, developed by Ford Motor Company (FORD), consists of the following three parts under the same title:
The materials defined in these standards are closed-cell polypropylene foams produced by compression molding expanded polypropylene beads for non-visible applications.
These standards were originally designed for materials used in door trims, seat and carpet backings, instrument box reinforcements, and energy-absorbing mechanisms in instrument panel interior components.
Since these materials do not contain ultraviolet (UV) stabilizers, prolonged exposure to direct sunlight will cause chalking and loss of properties.
This specification requires the use of approved sources. When this specification is listed in a drawing, CAD file or other document, only sources identified in the Ford approved source list may be used. The list of approved sources is available on the Ford official website or can be obtained from Ford Materials Engineering.
All test values are based on material conditioned in a controlled environment at 24 degrees plus/minus 23 degrees and 2 percent plus/minus 50 percent relative humidity for at least 7 hours prior to testing. Testing of material shall be performed in the conditioning environment or immediately after removal.
The infrared (IR) spectra and thermograms from the initial material approval constitute the reference standard and are filed with the designated materials laboratory. The material supplier shall ensure that all future materials supplied to the specification produce IR spectra and thermograms corresponding to the reference standard when tested under the same conditions.
The standard requirements for production materials are as follows: Many 2011D resin standards prior to 4 defined specific requirements with a symbol indicating that the average and plus/minus 3 sigma values must be reported. The minimum, maximum, or range of the standard was determined using 3 sigma data. The number of samples required for each test for 2011 and later is included in the table provided in the standard. This specification is based on virgin material and does not allow for the addition of recycled content.
All test samples must be free of molded leather. All testing is performed on production materials produced from the production process, unless the relationship to a non-production process has been reviewed and approved by Ford materials engineering.
Polypropylene is widely used in the automotive industry to manufacture batteries, bumpers, dashboards, interior elements and door trims. Polypropylene is a semi-rigid, cost-effective and durable thermoplastic linear hydrocarbon polymer resin that offers excellent chemical, electrical and fatigue resistance at high temperatures. It is considered a non-hazardous plastic and is therefore used in the manufacture of a variety of products from plastic furniture and machinery to pill boxes and syringes.
Despite its versatility and durability, this material has some disadvantages, such as its susceptibility to oxidation, high flammability, and sensitivity to chlorinated solvents and aromatics.
Polypropylene is a thermoplastic material and as such can be heated to its melting point, cooled, and then heated again without significant degradation. This property, along with its ability to liquefy rather than burn when exposed to high temperatures, are two critical properties that make polypropylene a popular choice for manufacturing applications such as injection molding.
Polypropylene is the most commonly used plastic in automotive manufacturing. Being a thermoplastic polymer, it can be easily formed into almost any shape. It has excellent chemical and heat resistance and is generally impact resistant. Polypropylene is used in car bumpers, gas cans, and even the carpet fibers of car interior upholstery.
In general, high-performance plastics used in automobiles provide the necessary safety and security in vehicles. Polyurethane foam is commonly used in instrument panels and door panels to provide insulation and reduce noise levels inside the vehicle. The foam helps absorb vibrations and reduce road noise, making the interior of the vehicle quieter and more comfortable for passengers.
Among the numerous testing, measurement, analysis and evaluation studies that our organization has carried out for businesses in various sectors, it also provides testing services defined in the “Ford WSS-M4D815 Polypropylene (PP) foam, closed cell” standard with its trained and expert staff and advanced technological equipment.
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