AS 4758.2:2015 – Lifejackets Part 2: Materials and components—Requirements and test methods
AS 4758.2:2015 – Lifejackets Part 2: Materials and components—Requirements and test methods.
8.6 COLD FLEXIBILITY
When foam buoyancy material is tested as follows there shall be no cracking when examined under a magnification of 5x.
Within 5 a of conditioning for 4 h at a temperature of 18 ±l°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 POl.YIFklC FOAI COATINCS
Structural polymeric foam coating material shall comply with the requirements specified in Table 8. I
8.7.2 (old flesihilily
The cold flexibility performance of polymeric foam coating material shall be determined as follows:
A sample of polymeric foam coating. 25 mm x 200mm is bent within 5 a of conditioning at
—30 ±2°C for 4 h around steel mandrel 10 mm in diameter that has been eondiioncd with the sample. The sample is examined for cracking or other damage under Sx magnification.
8.7.3 BlockIng resistance
The blocking resistance of polymeric foam coating material shall be determined as follows:
(a) Fold a sample of polymeric foam coating, 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 cm for 30 mm,
(c) Remove sample from chamber and allow to cool to ambient temperature for 2 h.
(d) Lnfold the sample and examine it for blocking under 5x magnification.
Blocking is defined as follows:
(i) No blocking Surfaces are free or adhere slightly.
(ii) Slight blocking Surfaces need to be lightly peeled to separate.
(iii) Blocking Surfitces separate wih dirnculty.
8.7.4 Water absorption
The water absorption property of polymeric foam coating material shall he determined as follows:
A weighed sample. 25 mm x 75 mm. of polymeric foam coating material is immersed in grade 3 water complying with ISO 3696 at 21 ±2°C for 214 h and weighed again after removal from the waler and the removal of adherent water
An inflation operating head shall withstand a force oF 220 N applied to it in any direction without any evidence of fracture, leakage of gas from the buoyancy chamber, or other damage.
Automaic inflation systems shall initiate tiring in automatic mode within S s of immersion.
The force required to operate the pull toggle on an inflation operating head shall be not greater than 75 N, but shall be greater than 20 N when tested and when pulled in the direction stated by the manufacturer.
Any exposed edge or projection of an inflation system shall not be so sharp as to damage the material of an inflatable compartment or constitute a risk of injury to persons during intended use.
Infialion systems shall be non-return, allowing the inflation gas to flow in the direction that supplies the buoyancy chambers only, unless intentionally over-ridden.
10.2 METAlLIC COMPONENTS
Aflcr exposure to a neutral salt spray in accordance with ISO 9227 11r 720 h, metallic components of an inflation system, except for the following, shall be capable of performing their intended functions and there shall be no visible pitting or other damage to the surfaces:
(a) An expendable Component, such as a gas cylinder when the component is provided with a durable zinc coating or an equivalent protection against corrosion.
(b) A component where failure does not affect the ability of the device to meet the requirements of this Standard.
(c) Sacrificial anodes, where fitted.
Combination of metal components shall be compatible unless otherwise protected against
Inflatable lifejackets shall have a simple method for deflation.
10.4 ORAL INFLATION SYSTEMS
The oral inflation tube shall be free from burrs and shall incorporate an effective non-return valse. The non-return valve shall open at an applied pressure of between 1.0 kPa and 3.0 kPa.