SN EN ISO 306-2014 pdf free.Plastics – Thermoplastic materials – Determination of Vicat softening temperature (VST) (ISO 306:2013).
SN EN ISO 306 specifies four methods for the determination of the Vicat softening
temperature (VST) of thermoplastic materials:
— method A50 using a force of 10 N and a heating rate of 50 K/h;
— method B50 using a force of 50 N and a heating rate of 50 K/h;
— method A120 using a force of 10 N and a heating rate of 120 K/h;
— method 11120 using a force of 50 N and a heating rate of 120 K/h.
The methods specified are applicable only to thermoplastics, for which they give a measure of the
temperature at which the thermoplastics start to soften rapidly.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are indispensable to its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 291, Plastics — Standard atmospheres for conditioning and testing
ISO 293, Plastics — Compression moulding of test specimens of thermoplastic materials
ISO 294-1, Plastics — Injection moulding of test specimens of thermoplastic materials — Part 1: General principles, and moulding of multipurpose and bar test specimens
ISO 2942, Plastics — Injection moulding of test specimens of thermoplastic materials — Part 2: Small tensile bars
ISO 294-3, Plastics — Injection moulding of test specimens of thermoplastic materials — Part 3: Small plates
ISO 472, Plastics — Vocabulary
ISO 2818, Plastics — Preparation of test specimens by machining
ISO 20753, Plastics — Test specimens
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 472 and the following apply.
3.1 penetration distance over which the indenting tip has to penetrate into the specimen under test
3.2 load force applied to test specimen by means of the indenting tip
Note I to entry: It is expressed in Newtons (N).
3.3 Vicat softening temperature VST temperature at which a flat-ended needle penetrates the specimen to a depth of 1 mm under a specified load using a selected uniform rate of temperature rise
Note ito entry: It is expressed in degrees Celsius (°C).
4 Principle
The temperature at which a standard indenting tip with a flat point penetrates 1 mm into the surface of a plastic test specimen is determined. The indenting tip exerts a specified force perpendicular to the test specimen, while the specimen is heated at a specified and uniform rate.
The temperature, in degrees Celsius, of the specimen, measured as close as possible to the indented area at 1 mm penetration, is quoted as the VST.
5 Apparatus
5.1 Heating equipment, consisting of one of the following (5.1.1. 52 or &L) that will accept a minimum of two test frame assemblies and a cooling device (&L4).
The heating equipment shall be provided with means of temperature control, enabling the temperature to be raised at a uniform rate of(50 ± 5) K/h or (120 ± 10) K/h.
The heating rate shall be verified
— either by checking and recording automatically over the whole temperature range, or
— by manually checkingand recordingthe temperature change at 6-mm intervals overthe temperature range being verified.
The requirement for the heating rate shall be considered satisfied if, over every 6-mm interval during the test, the temperature change is (5 ± 0,5) °C or (12 ± 1) °C, respectively. For multiposition heating equipment, the heating rate shall be verified at each test station. The apparatus may be designed to shut off the heat automatically and sound an alarm when the specified indentation has been reached.SN EN ISO 306 pdf free download.
Tags: Plastics
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