Back SearchTitle: TRANSPORT OF 1,1,1,3,3-PENTAFLUOROBUTANE (HFC-365mfc) IN RIGID POLYURETHANE FOAM AND POLYETHYLENE
Page Range: p.155-164
Author(s): Mangs S; Froeling M; Ramnas O; Jarfelt U
File size: 96K
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Issue Year: cp
Volume: 21
Issue No: No. 3
Abstract
The mass transfer properties of HFC-365mfc in the insulating system used in most district heating pipes produced today, i.e. rigid PU foam with a protective layer of HDPE, were studied. The solubility, permeability and diffusion coefficients for HFC-365mfc in PU foam and HDPE were determined. The coefficients for HFC-365mfc in PU foam were very similar to those of cyclopentane, currently the most commonly-used blowing agent in PU foams used for district heating pipes in Europe. The PE casing was a better diffusion barrier for HFC-365mfc than it was for cyclopentane. The main mass transfer resistance of HFC-365mfc in a district heating pipe was, however, found in the PU foam. 14 refs.
Title: EFFECT OF CELL SIZE ON THE PHYSICAL PROPERTIES OF CROSSLINKED CLOSED CELL POLYETHYLENE FOAMS PRODUCED BY A HIGH PRESSURE NITROGEN SOLUTION PROCESS
Page Range: p.165-194
Author(s): Rodriguez-Perez M A; Gonzalez-Pena J I; Witten N; de Saja J A
File size: 219K
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Issue Year: cp
Volume: 21
Issue No: No. 3
Abstract
The thermal conductivity, thermal expansion, mechanical properties at low strain rates and dynamic mechanical properties of a collection of crosslinked closed cell PE foams manufactured by a high pressure nitrogen solution process were studied as a function of the cell size. The main mechanisms that influenced each property and the foam microstructure were examined in an attempt to explain the results. A theoretical model was used to examine the thermal conductivity values. The results showed the extent to which reducing the cell size could improve the insulating capabilities of these materials. The effect of cell size on the mechanical properties at low strain rates was very small, so the thermal expansion did not depend on cell size. The structural characteristics, however, influenced the dynamic mechanical response at temps. below 15C. 25 refs.
Title: DEVELOPMENT OF A NEW LARGE FLAMING IGNITION SOURCE FOR UPHOLSTERED SEATING AND MATTRESS TESTS. I. CHARACTERISATION OF IGNITION SOURCES
Page Range: p.195-210
Author(s): Laperre J; Paul K T
File size: 200K
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Issue Year: cp
Volume: 21
Issue No: No. 3
Abstract
The development of a large flaming ignition source for upholstered seating and mattress tests is discussed. Ignition sources considered include newspaper, wood, CEN multi-jet gas burner and solvent/paper. Ignition sources are characterised in terms of heat release rate by oxygen consumption cone calorimetry and heat flux distribution measurements carried out towards the back and the base of an inert L-shaped test rig simulating the seating test rig. 6 refs.