AS 4758.2:2015 pdf free download – Lifejackets Part 2: Materials and components—Requirements and test methods

AS 4758.2:2015 pdf free download – Lifejackets Part 2: Materials and components—Requirements and test methods.
6.1 CONSTRUCTION
Closures and adjusters, such as buckles and slide adjusters shall comply with the criteria
specified in Table 6.1 when subjected to the tests specified in that table.
6.2 PERFORMANCE
6.2.1 Tensile strength
The assembly shall consist of the hardware component with two lengths of webbing 1 50 mm in length attached as they are for use.
A constant rate-of-extension tensile testing machine with a rate of’ extension of 300 ±10 mm/s and jaws not less than the width of the webbing shall be used.
A tensile load shall be applied until breakage, disengagement, slipping in excess of 75 mm or a similar condition occurs.
The tensile load at failure shall be reported.
6.2.2 Strength/slippage
An assembly consisting of the hardware component with webbing attached as for use shall he subject to a tensile load for 10 mm using either the fixed straight-length method or the loop assembly methods as follows:
(a) Fixed straight-length method
Two lengths of webbing not less than 600 mm in length shall be used to make up the assembly as shown in Figure 6.1(a).
One end of the assembly shall be secured to a fixed point and a steady load shall be applied to the other.
The assembly shall he made up with a single piece of webbing not less than 1200mm in length as shown in Figure 6.1(h).
The assembly loop shall be supported vertically over a cylinder and a second cylinder shall provide the means for applying a steady load [see Figure 6.1(b)].
6.2.3 Tab disengagement
The assembly shall consist of the hardware component with two lengths of webbing not less than 600 mm in length attached as for use.
One end of the assembly shall he secured to a rigid fixture and a mass of 2.25 kg shall he attached to the other end.
The mass shall be raised 300 mm above the attachment point and shall be released to apply a shock load to the assembly.
8.6 COLD FLEXIBILITY
When foam buoyancy material is tested as follows there shall he no cracking when examined under a magnification of 5x.
Within 5 s of conditioning for 4 h at a temperature of 18±1°C the longest dimension of a sample of foam buoyancy material is wrapped around a bar with a diameter not greater than twice the thickness of the foam and examine for cracking under a magnification of 5x.
8.7 POLYMERIC FOAM COATINGS
8.7.1 Performance
Structural polymeric foam coating material shall comply with the requirements specified in Table 8.1.
The cold flexibility performance of polymeric foam coating material shall he determined as follows:
A sample of polymeric foam coating, 25mm x 200mm is bent within 5 s of conditioning at
—30 ±2°C for 4 h around steel mandrel 10 mm in diameter that has been conditioned with
the sample. The sample is examined for cracking or other damage under 5x magnification.
8.7.3 Blocking resistance
The blocking resistance of polymeric foam coating material shall he determined as follows:
(a) Fold a sample of polymeric foam coaling. 200 mm x 200 mm, along its centre-line with external surfaces laid together.
(b) Place sample in a chamber at a temperature of 82 ±2°C under a load of 50 N per 50 cm2 for 30 mm.
(c) Remove sample from chamber and allow to cool to ambient temperature for 2 h.
(d) Unfold the sample and examine it for blocking under 5x magnification. Blocking is defined as follows:
(i) blocking Surfaces are free or adhere slightly.
(ii) Slight blocking Surfaces need to be lightly peeled to separate. (iii) Blocking Surfaces separate with difficulty.