SPRAYFOAM Professional - Spring 2016 - (Page 34)

SPF RESEARCH SPF RESEARCH ON AIR QUALITY - PART 2 REDUCING OCCUPATIONAL EXPOSURE DURING OPEN CELL INSTALLATIONS BY DAN NELSON, GACO WESTERN I n the previous issue of SPRAYFOAM Professional (Winter 2015) results of research being conducted with open cell foam installation was introduced. This research is expected to lead toward reductions in occupational, trade and occupant exposure to chemicals with the potential for substantially reduced re-entry times. Per ongoing research being performed by Gaco Western, self-compressing polyurethane foam technology - when used along with a pre-installed membrane - has equated to better air quality during open cell foam installations. Detailed occupational exposure results for both the sprayer and the helper, which resulted from this study, are outlined in Part 2 of this article. As the summary chart from Part 1 showed, dramatic reductions in occupational chemical exposure resulted from the installation of foam utilizing Gaco's new ProFill membrane system. Air Sampling and Hazard Analysis All installations were performed under conservative scenarios such as utilizing minimal air flow (low ACH ranging from 0.042 to 0.400). In this regard and contrary to normal and recommended practices, no exhaust fans were used. All windows were either closed or sealed over with plastic. Front doors were open to receive hoses, otherwise the structures only exhibited ventilation through seams and unsealed penetrations. All personnel in the area wore all appropriate PPE at all times. Air sampling was performed ONLY during the foam application period. Spray times and proportioner stroke counts were monitored during foam installations. Air sampling tubes were attached to both the sprayer and the helper, with tube openings near their breathing zones. The collection tubes were attached to an air pump attached to each individual's belt. 34 SPRAYFOAM PROFESSIONAL | Spring 2016 The isocyanate sampling method uses a dry sampler that is composed of two sections: a filter located at the base of the sampler and a denuder section that runs the length of the sampler. The resulting collections were analyzed analytically by LC/MS. TCPP and amines are also collected and were later analyzed by GC with an NPD detector. Air Sampling Collection Tubes. Note that during the installations of the GacoProFill foam, there were instances where the applicator triggered the gun too early (prior to penetrating the membrane) or held the trigger as the gun was being pulled back. This causes a small amount of foam to splatter onto the sprayer, and potentially released volatiles into the air that would not have been released if procedures were more carefully followed. The air quality analysis results include these "real world" installation errors. Results - Combined Occupational Chemical Exposure Thresholds: * BDMAEE Amine - ACGIH TLV-TWA - 0.0 5ppm - (continuous 8 hr timeweighted avg exposure value) * TCPP - none * 4,4-MDI - OSHA Permissible - 0.020 ppm - (ceiling value) * 4,4-MDI - ACGIH TLV-TWA - 0.005 ppm - (continuous 8 hr time-weighted avg exposure value)

Table of Contents for the Digital Edition of SPRAYFOAM Professional - Spring 2016

EXECUTIVE DIRECTOR’S CORNER
PRESIDENT’S POST
FOAM BUSINESS NEWS
SPFA TODAY
LEGISLATIVE UPDATE
KEYNOTE SPEAKER – RICHARD R. RAWLINGS
OSHA STANDARD FOR CONFINED SPACES:
SUSTAINABLE CONSTRUCTION: TRANSPARENCY AND CHOICE
INDUSTRY’S CHALLENGES SHAPE OUR EVOLUTION
SPF RESEARCH ON AIR QUALITY – PART 2
NEW CONSTRUCTION NEEDS OPEN DOORS FOR SPF INDUSTRY
TOP TRUCKS FOR SPF CONTRACTORS
BEHIND THE FOAM
2015 SPFA CONTRACTOR AWARDS
SPEAKING SENSIBLY
ABAA NEWS
ASK THE EXPERT – How to Write Clear Contracts
UPCOMING EVENTS
INDEX OF ADVERTISERS | ADVERTISERS.COM

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