Kahulugan at paggamit
4.1 The ability of plastic materials to resist deterioration of electrical, mechanical and optical properties due to exposure to light, heat and water is important for many applications. This practice is designed to cause changes in properties related to end-use conditions, including the effects of sunlight, moisture and heat. The exposures used in this practice are not intended to simulate deterioration caused by local weather phenomena, such as atmospheric pollution, biological attacks, and salt water exposure.

4.2 Precautions – Results may change when operating conditions vary within the accepted limits of this practice. Kaya nga, reference to the use of this practice must not be made unless accompanied by a report prepared in accordance with section 9 describing the specific operating conditions used. For more information about the precautions that apply to using results obtained under this practice, see Practice G151.

Tala 2: For additional information on sources of variability and strategies to address variability in the design, execution, and data analysis of laboratory accelerated exposure tests, see Guide G141.

4.2.1 The spectral power distribution of light from an open flame carbon arc is significantly different from that produced by light and water exposure devices using other carbon arc configurations or other light sources. The type and rate of degradation and performance rankings produced by exposure to filtered open flame carbon arcs may be very different from those produced by exposure to other types of laboratory light sources.

4.2.2 Inter-laboratory comparisons are valid only if all laboratories use the same type of carbon arc, filters and exposure conditions.

ASTM D1499-2021 Practice for the Manipulation of Exposure and Water Blasting Devices (Carbon Arc Type) for Plastic Exposure

4.3 The reproducibility of test results between laboratories has been shown to be good when evaluating the stability of a material according to its performance class compared to other materials or controls. 5,6 Kaya nga, Mahigpit na inirerekomenda na ilantad ang mga katulad na materyales na may mga kilalang katangian (mga kontrol) kasabay ng pagsubok na materyal. At least three repetitions of each material are recommended to enable statistical evaluation of the results.

4.4 Test results will depend on the degree of care taken to operate the equipment in accordance with practice G152. Important factors include regulation of line voltage, absence of salt or other water deposits, temperature and humidity control, and electrode conditions.

Radius
1.1 This practice covers specific procedures and test conditions applicable to plastic exposure in filter open flame carbon arc installations conducted in accordance with Practices G151 and G152. The practice also includes the preparation of the sample, the test conditions suitable for the plastic, and the evaluation of the test results.

1.2 This practice does not include closed carbon arc exposure of plastics, which is allowed by practice D1499. Closed carbon arc exposure of plastics is described in practice D6360 and G153, where the requirements for exposure of non-metallic materials in a closed carbon arc device are set forth.

ASTM D1499-2021 Practice for the Manipulation of Exposure and Water Blasting Devices (Carbon Arc Type) for Plastic Exposure

1.3 Values expressed in SI units shall be treated as standard values. The values in parentheses are for reference only.

1.4 Ang pamantayang ito ay hindi nilayon upang matugunan ang lahat ng mga alalahanin sa kaligtasan, kung meron man, na nauugnay sa paggamit nito. Responsibilidad ng mga gumagamit ng pamantayang ito na magtatag ng angkop na kaligtasan, mga kasanayan sa kalusugan at kapaligiran at upang matukoy ang pagiging angkop ng mga paghihigpit sa regulasyon bago gamitin.

Tala 1: This practice is technically equivalent to ISO 4892-4.

1.5 Ang internasyonal na pamantayang ito ay batay sa mga prinsipyo ng standardisasyon na kinikilala ng internasyonal na itinatag sa Desisyon sa mga Prinsipyo para sa Pag unlad ng mga Internasyonal na Pamantayan, Mga Patnubay at Rekomendasyon na inilabas ng WTO Committee on Technical Barriers to Trade.