| by Duncan Geddes
What is UL94v-0? UL94v-0 is a fire standard set by UL – an American worldwide safety consulting and certification company headquartered in Northbrook, Illinois. UL94v-0 is used to determine the flammability of a specified material. Why we test and measure to UL94v-0? UL94v-0 is tested and measured to allow engineers to understand the flammability characteristics […]
| by Duncan Geddes
Polyurethane foams which are based on aromatic isocyanates will all exhibit various shades of yellowing when exposed to light, including to ultra violet radiation. Yellowing is a surface effect and has no significant impact on the physical properties of the foam. The degree of yellowing depends on the intensity of the radiation. Ultra violet radiation […]
| by Duncan Geddes
Flexible polyurethane (PU) foam, because of its relatively low cost and attractive property profile, is used in a variety of applications such as automotive seating, transportation, upholstery and bedding, packaging and medical applications. However, due to its low density and open cellular structure PU foam has a large surface area and high air permeability […]
| by Duncan Geddes
Various types of materials are used as sealing and gasket materials in a number of sectors, some of which are:- automotive, aerospace and aeronautics, transportation, biotechnology, chemical industry, construction industry, electronics, food and beverages, oil and gas, water treatment and pharmaceuticals. Types of sealing foam One class of materials that find use in various […]
| by Duncan Geddes
Amino polymers are defined as polymers formed by the interaction of amines or amides with aldehydes, the two most common amino polymers are urea-formaldehyde and melamine-formaldehyde. Basotect® (BASF registered trademark) is an open celled melamine-formaldehyde foam. How melamine works Melamine is produced by heating urea in the presence of ammonia at high temperatures and […]
| by Duncan Geddes
Polyurethane (PU) foams are renowned for their superior resilience and versatility, the likes of which make them the ideal choice for use across the construction and automotive industries. This article aims to uncover even more about the physical properties of polyurethane foam and establish how these characteristics have helped to make this type of foam […]
| by Duncan Geddes
Airflow, cell size and density, are the main factors influencing the effectiveness of sound absorption in acoustic foams(aka sound deadening foams). Increasing the cell count (ie the number of cells per 25mm of length) of the foam improves the sound absorption at all frequencies. The acoustic absorptivity a specifies the ratio of un-reflected sound in […]
| by Duncan Geddes
Flexible polyurethane open-cell foam is manufactured in a wide range of densities. This is due to the huge number of different applications that foam is used within, ranging from washing up sponges and bath sponges, up to heavy-duty packaging and mattresses. Within Europe, the lowest density is 10kg/m3, which in reality is so light that […]
| by Duncan Geddes
Within the foam industry, the disposal of scrap foam is becoming an increasingly important subject for both the manufacturers and converters of polyurethane foam. Foam is inherently a volumetric, but light-weight material, so what methods are there to dispose of scrap foam? A brief history of scrap foam Flexible polyurethane foams were […]