ISO 812-2017 pdf free.Rubber, vulcanized or thermoplastic一Determination of low-temperature brittl eness.
8.1.1 Bring the bath or test chamber to a temperature below the expected lowest temperature of non-failure. In the case of a liquid heat-transfer medium, place sufficient liquid in the bath to ensure approximately 25 mm depth or more of the liquid over the test piece(s). Pre-cool the test piece clamp by immersing it in the cooled bath or test chamber.
8.1.2 Quickly mount the test piece(s) in the test piece clamp and immerse them for 5 mm at the
test temperature when using a liquid medium or for 10 mm when using a gaseous medium (see also
Iso 23529).
NOTE 1 For very soft materials, it might be necessary to use a device to support the test piece horizontally
until just before the striker is released.
The free length of the test piece(s) shall be greater than 19 mm.
Test five type A or type B test pieces. If the available striking energy has the minimum value specified in 4.1.2. they may all be tested at the same time.
Proper tightening of the clamp is of the utmost importance. The clamp shall be tightened so that each test piece is held with approximately the same clamping torque.
NOTE 2 Ii has been reported that the temperature at which a test piece fails can be affected by the clamping torque. Clamping to a torque of 0,15 N•m to 0,25 Nm is suggested.
8.1.3 After immersion for the specified time at the test temperature, record the temperature and deliver a single impact blow to the test piece(s).
8.1.4 Remove the test pieces from the test piece clamp and allow them to reach standard laboratory temperature. Examine each test piece to determine whether or not it has failed. Failure is defined as any crack, fissure or hole visible to the naked eye or complete separation into two or more pieces. Where a test piece has not completely separated, bend it to an angle of 90° in the same direction as the bend caused by the impact. Then, examine it for cracks at the bend.
8.1.5 Repeat the test at each of a series of successively higher temperatures 10 °C apart, using a new set of test pieces at each temperature until no failure is obtained. Then, decrease the temperature to the highest value at which a failure was observed and carry out tests at temperatures increasing at 2 °C intervals to determine the temperature at which no failure is observed. Record this as the brittleness temperature.
If crystallization or time-dependent effects of plasticizers are to be studied, longer conditioning periods in a gaseous medium may be used.ISO 812 pdf free download.
Tags: Rubber, vulcanized or thermoplastic
-
ISO 8600-1-2013 pdf free download.Endoscopes – Medical endoscopes and endotherapy devices – Part 1: General requirements. 6 Marking 6.1 Minimum marking Iach individual endoscope or endotherapy device shall have the lollowing minimum marking: a) model number and/or other mark sufficient to identify the endoscope or endotherapy device and its manufacturer; b) maximum insertion portion width, minimum instrument channel width, working length, field of view and/or direction of view where such identification is necessary for the intended use of the endoscope or endotherapy device. The Insertion portion width and instrument channel width units shall be in millimetres. The insertion portion width and instrument channel width can also be marked in French size as defined in 3.5, shown by either ‘Fr or an encircled number; c) wherever reasonable and practicable. the endoscope or endotherapy device and detachable component(s) shall be identified in terms of lot numbers or serial numbers, etc. 6.2 Marking legibility The marking shall remain legible over the lifetime of the device when the endoscope or endotherapy device is used, cleaned, disinlected, sterilized and stored in accordance with the instruction manual. 6.3 Marking exceptions When marking on the endoscope or endotherapy device or detachable component(s) is impossible to achieve due…
-
ISO 15688-2012 pdf free download.Road construction and maintenance equipment – Soil stabilizers 一 Terminology and commercial specifications. This International Standard establishes the terminology, definitions of operation and commercial specifications for soil stabilizers and their components intended for use in road construction and pavement works. It does not apply to soil stabilizers used in agricultural applications. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for 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 3911, Wheels and rims for pneumatic tyres — Vocabulary, designation and marking ISO 6746-1, Earth-moving machinery — Definitions of dimensions and codes — Part 1: Base machine ISO 6746-2, Earth-moving machinery — Definitions of dimensions and codes — Part 2: Equipment and attachments ISO 7134. Earth-moving machinery — Graders — Terminology and commercial specifications 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 soil stabilizer self-propelled machine, either towed or transported, with the function of pulverizing, breaking-up, aerating, homogenizing, and loosening existing and imported soil or paving materials and mixing them…
-
ISO 18436-1-2012 pdf free.Condition monitoring and diagnostics of machines – Requirements for qualification and assessment of personnel一 Part 1: Requirements for assessment bodies and the assessment process. 5 Requirements for assessment body personnel 5.1 General provisions In order to ensure that the assessment process is carried out effectively and uniformly, the competence requirements for personnel involved in the entire process shall be defined by the assessment body and, in the case of a third party, be approved by the responsible TCC (in accordance with ISO/IEC 17024). The assessment body shall require its personnel (internal or external) to sign a contract, or other document, by which they commit themselves to comply with the rules defined by the assessment body, including those relating to confidentiality and those relating to independence from commercial and other interests, and from any prior or present link with the persons to be examined that would, in the opinion of the interested parties, compromise impartiality. Clearly documented instructions shall be available to the personnel, describing their duties and responsibilities. These instructions shall be maintained up to date. All personnel involved in any aspect of assessment activities shall possess appropriate educational qualifications, experience and technical expertise, which satisfy defined…