Correlations between Microscale Combustion Calorimetry and Conventional Flammability Tests for Flame Retardant Wire and Cable Compounds

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Microscale combustion calorimetry (MCC) has recently become commercially available for assessing flammability of polymers using only milligrams of test specimen. Although significant data and correlations with conventional flammability tests such as UL 94, Limiting Oxygen Index, and cone calorimetry are available in the literature, correlation data for polymers containing flame retardants are still limited. In this study, we conducted MCC on 15 commercially available flame retardant wire and cable compounds. The MCC parameters measured include heat release capacity, temperature at peak specific heat release rate, total heat release, and char yield. These parameters were correlated with the conventional flammability tests and the results are discussed in this paper.

A novel polymeric intumescent flame retardant: Synthesis, thermaldegradationmechanism and application in ABS copolymer

This article was published in Polymer Degradation and Stability, 16 June 2012.


A novel polymeric intumescent flame retardant containing phosphorous-nitrogen (PSPTR) was synthesized and characterized by FTIR, 1H NMR and 31P NMR. Moreover, a new IntumescentFlameRetardant (IFR) system, which was composed of PSPTR and Phenol Formaldehyde Resin (PF), was used to impart flame retardancy for ABS. Flammability properties of ABS/IFR composites were investigated by Limiting Oxygen Index (LOI) and Vertical Burning Test (UL-94), respectively. The results showed that when the total addition content was 30wt%, the weight ratio of PSPTR to PF is 1:1, the LOI value of ABS/IFR reached 28.2, and UL-94 reached V-1 rating. A distinct synergistic flameretardant effect exists between PSPTR and PF. The TGA data showed that the IFR (PSPTR/PF=1:1, wt %) had three weight-loss stages and had a high residue of 50.21wt% at 700 ºC. The thermaldegradation process of PSPTR and char-forming mechanism of IFR was studied by thermogravimetric analysis/infrared spectrometry (TG-IR) detailedly.

New Flame Retardant Foam Created

Woodbridge announced the development of a flame retardant foam, for a range of under-hood acoustical and thermal insulating applications, to meet increasingly stringent OEM needs. This new material represents a significant breakthrough in flammability performance for Noise, Vibration and Harshness (NVH) solutions, offering enhanced sound absorption and transmission loss properties, versus competing materials including metals and engineered fibres.

WhisperTech UL-94 V0 rated foams self extinguish, once exposed to an open flame, in both horizontal and vertical test protocols. This formulation can also be specifically engineered to meet specifications including; Coloring including black, Heat Aging, Humidity Aging and No-Drip performance.

WhisperTech foams can be fabricated in mechanically cut sheets, or molded into custom fit complex geometries, to meet exacting levels of acoustical performance. Domenic Sinopoli, Executive Director of Sales and General Manager StrataForm, The Woodbridge Group, states “WhisperTech UL-94 V0 rated, low density flexible urethane formulations are used to balance cost and NVH performance requirements, for Hood Liners and Dash Insulators. This solution also offers excellent thermoforming performance, using a variety of face materials to optimize the finished product.”

Pejman Hashemi, WhisperTech NVH Solutions Product Manager, The Woodbridge Group, notes “These extreme flame retardant formulations, are available for a wide range of molded components in contact with the engine such as: Beauty Covers and various acoustical insulators for Manifolds, Valve and Cam Covers, Fuel Rails, Air Intakes and Pumps. Additionally, these products can integrate fasteners and mounting brackets for ease of assembly.”


Pejman Hashemi, WhisperTech™ NVH Solutions Product Manager The Woodbridge Group®


Trends and technical developments in the international flame retardant industry

Trends and technical developments in the international flame retardant industry, 14-15 June 2012, Grand Hyatt Denver, Denver, CO, USA, Organized by Applied Market Information LLC (AMI)

Fire Retardants in Plastics 2012 will take place June 14 – 15, 2012 at the Grand Hyatt Denver in Denver, Colorado, United States.
This second annual conference will provide an international forum for all companies involved in flame resistance plastics to learn about the latest developments influencing the industry. The conference will provide an overview of flame retardants, looking at material developments, new additives and formulations, an overview of standards and testing, as well as the current market trends and technical challenges.
Fire Retardants in Plastics 2012 will have lively interaction between the international panel of speakers and delegates stimulating debate in all sectors providing a comprehensive overview of the latest material, technology and business trends.


Please find here an interesting document! (Author: R.E. Lyon, Fire Research Program, Fire Safety Section AAR-422, FEDERAL AVIATION ADMINISTRATION-USA)

Design and optimization of an intumescent flame retardant coating using thermal degradation kinetics and Taguchi’s experimental design

This intersting article was published on Feb. 15, 2012 in Polymer International.


Two supplementary approaches in terms of thermal degradation kinetics and Taguchi’s experimental design were employed toward developing a design effort for intumescent coatings. A model intumescent system including ammonium polyphosphate (APP), pentaerythritol (PER), melamine (MEL), thermoplastic acrylic resin and liquid hydrocarbon resin was chosen and then subjected to thermogravimetric analysis and heat insulation tests to provide experimental data. Kinetic analysis of the thermogravimetric data based on the Friedman and Kissinger methods revealed that activation energy (Ea) and reaction order (n) could be used as parameters to accurately judge whether the selected intumescent components represented coordinated thermal characteristics. Examination of the calculated Ea and n values showed that the decomposition of thermoplastic acrylic resin and liquid hydrocarbon resin occurred first and that the APP, PER and MEL components were degraded immediately after. Such a degradation sequence was quite consistent with the functional mechanism of intumescent systems. In addition, simultaneous implementation of analysis of variance and mean effect assessment on the Taguchi data demonstrated that the designed formulation, based on the optimized coupling of 10 g MEL into APP/PER 25 g/11 g, exhibited the highest fireproofing time among the prepared coating samples. The APP content had the most important contribution to the flame retardant behaviour, and APP versus PER interactions showed the highest severity index. Scanning electron microscopy showed that the higher flame retardancy of the optimized sample was related to the presence of a large number of micropores in the expanded charring layer structure.

Flame Resistant Transparent Resin Technology collaboration REQUEST

A major materials US manufacturer seeks joint development partners for technologies to make resins incombustible in order to develop flame-resistant transparent resins. They are interested in joint development, technology licensing.

Closing date: 01/07/2012


Technologies that increase the flame resistance of polymeric materials have been sought for many years, as ease of burning is an intrinsic shortcoming of polymers. Various technologies for flame resistance have been developed, but no technologies have been implemented that confer a high degree of flame resistance while maintaining the transparency of resin. The client, who manufactures construction materials (e.g. roofing materials and windows) already has strong market penetration, and if the desired material was realized, it will be possible to enter the market quickly. The goal is to implement incombustible transparent resins ahead of other companies.

Anticipated approaches include, but are not necessarily limited to the following and wide-ranging proposals will be accepted:

-Using flame retardants or incombustible materials as additives

-Surface treatment of polycarbonate that make it incombustible.

Elemental technologies that enable transparency as well as incombustibility in a long term are also anticipated.

The following approaches are not under consideration at the present time:

-The use of toxic substances or the use of materials that generate toxic substances

-Technologies that cannot be applied to making polycarbonates flame resistant.

Technical Specifications / Specific technical requirements:

The client is developing polycarbonate materials that are incombustible or highly flame resistant for the purpose of realizing polycarbonate plates

(thickness: 2mm to 6mm) that can be used in place of glass plates as construction materials. In particular, the client is seeking innovative technologies

for conferring incombustibility or flame resistance that can solve the current issues of low light transmittance and the difficulty in producing thick films.

Desired flame-resistant resin materials:

-Resin: polycarbonate

-Thickness of the resin layer: 2mm to 6mm

-Flame resistance (safety Cone calorimeter method: according to ISO 5660-1 standard):

Total Heat Release under external heat flux of 50 KW/m² for 20 min: <8MJ/m²

Peak Heat Release Rate of >200 KW/m²: never continue for >10 sec

-Transparency: as high as possible

Light transmittance >60%

Haze: <5%

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