Full-face test

Full-face test. A panel of 60 healthy adults is recruited. 20 panellists are provided with the test material, 20 with control material, and 20 act as untreated controls. The 60 panellists are balanced according to sex, hand dominance, and initial skin grades of reaction. Panellists are asked to apply the materials to their forehead, cheeks, nose, chin, and neck after washing at least twice a day for 21 days. The levels of irritation in each of the three panels are compared to assess the irritancy of the test material relative to the control and the untreated groups. Subjective comments are also taken into consideration. At intervals throughout the study, the face is assessed for the standard parameters, primarily for erythema and dryness at six sites (forehead, right cheek, left cheek, nose, chin, and neck). All relevant panellists comments are recorded and considered in the final evaluation. 

Respiratory protective devices - Classification superseded BS 6928 1988 Respiratory protective devices - List of equivalent terms. Supersedes BS 6930 1988 Respiratory protective devices - Full face masks - Requirements, testing, marking. Supersedes BS EN 136-10 1992 and BS 7355 1990... 

AMD 2 Respiratory protective devices - Compressed air line breathing apparatus for use with a full face mask, half mask or a mouthpiece assembly - Requirements, testing, marking (AMD 10774J dated Januai-y 2000. With BS EN 138, BS EN 269 and BS EN 270, superseded BS 4667-3 1974... 

Figures 3 and 4 show the results of tests completed on single lots of the commercially available Soundcoat Dyad 606 and 3M ISD 112 damping polymer films. The measured results are plotted without the application of any time or temperature shifts. For each material, one sample was assembled using two specimens of the full face dimensions of the sample block. The 1.27-mm (0.050-in.)-thick Dyad specimens were cemented to the sample blocks using Soundcoat B-Flex epoxy, whereas the 0.051-mm (0.002-in.)-thick 3M specimens used 3M Type 1838 epoxy.

EN 136 1997 Respiratory protective devices - Full face masks - Requirements, testing, marking. 

The lumped thermal mass equation also describes the heating-up process of flat face or clamp flanges, where the failure mode is, however, the loss of tightness and consequent secondary leak and fire. It should be noted that when the limped thermal mass heat transfer model was used for the calculation of time-to-failure of flanges engulfed by fire, the results agreed well with the full scale tests in Ref 4. 

All tight-fitting respirators, whether halfmask or full face piece, required for use must be fit-tested on an annual basis. The purpose is to ensure a specific make, model, style and size respirator properly fit a user. Annual fit testing also ensures all users are properly trained on donning procedures, at minimum once per year. Fit testing is accompanied by a medical evaluation to reinforce that the user is fit to wear the respirator. 

They found the absorber pliable at room temperature and rigid and breakable at freezing temperatures. Although unsupported heets qf absorber sagged when exposed to the sun and smelled of coal tar (like creosote), the odor lessened with time and was not a serious disadvantage. Fire tests produced a gagging odor and full-face respirators were advisable if entry into the fire test chamber was necessary before ventilation. The toxicity of the absorber is unknown, but respiratory protection is warranted in the event of fire. 

Some of the numbers pass the red-face test, others do not. The Hazards Analysis estimate, for example, seems defensible. Such an analysis will typically utilize a team of about six people for at least 2 weeks. An additional two-man week is generally needed for preparation and report writing. If a cost of 100 per person-hour is assumed, then a full Hazards Analysis will cost 76,000—close to the estimate of 98,000 in Table 1.10. 

Data about the ability of equipment to protect against a particular hazard is provided by manufacturers who carry out tests under controlled conditions which are often specified in national or international standards. Performance requirements for face masks, for example, are contained in two British Standards which specify the performance requirements of full-face and half/quarter masks for respiratory protective equipment. The method used to determine the noise attenuation of hearing protectors at different frequencies (octave bands) throughout the audiWe range is specified in a European standard . 

British Standards Institution, BS EN 136 1998 Respiratory protective devices. Full face masks. Requirements, testing, marking. BS EN 140 1999 Respiratory protective devices. Half masks and quarter masks. Requirements, testing, marking BSI, London 1999... 

Where risk assessment shows air-purifying respirators are appropriate use a full-face respirator with multipurpose combination (US) or type ABEK (EN 14387 respirator cartridges as a backup to engineering controls. If the respirator is the sole means of protection, use a full-face supplied air respirator. Use respirators and components tested and approved under appropriate government standards such as NIOSH (US) or CEN (EU). 

One of the methods is to use shotcreting on the faces of masonry infills which can increase the stiffness and the lateral load capacity of the infilled frame and reduce the lateral drift at the ultimate load. Calvi and Bolognini (2001) have performed full-scale tests in which they have placed a 10 mm plaster on both sides of a masonry infill wall covering either reinforcement (05 mm or 06 mm) or wire meshes and have studied the behavior of the strengthened infilled frame. Based on their observations from the experiments, the introduction of some reinforcement in the mortar layers, with a geometrical percentage lower than 1 %, will almost double the acceleration levels for the occupational and damage limit states. 

Experimentation with test animals and laboratory and plant experience indicate that the fluorophosphoric acids are less toxic and dangerous than hydrogen fluoride (58). However, they contain, or can hydrolyze to, hydrofluoric acid and must be treated with the same care as hydrofluoric acid. Rubber gloves and face shields are essential for all work with these acids, and full mbber dress is necessary for handling larger quantities. The fumes from these acids contain HF. 

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