RFP - Rubber Fibres Plastics International

I have loved you with an everlasting love

Yes, I have loved you with an everlasting love;
therefore with loving kindness
have I drawn you.
(Confirmation quote 1948)


Dear friends,

when you read these lines, Heinz Gupta no longer walks this earth. – Or does he? – In your hearts?

For thousands of years monumental tombs, pyramids or cathedrals have been built to keep alive the memory of the deceased. The most beautiful cathedrals, however, are the very hearts of friends in which a person lives on.

Many people have been very good to me and have supported and protected me.
I thank them all!

And, regretfully, I also hurt other people by knowingly or unknowingly doing them wrong. For this I ask for forgiveness.
Please forgive me!

I hope you all will have many more joyful and happy years. Be kind to each other and
to the animals and plants, to all of God’s creation.

Your Heinz Bijoy Prosad Gupta



We mourn the loss of
Dr. Heinz Bijoy Prosad Gupta
*31.7.1932    †30.9.2020

Indira Gupta
and the staff of the
Dr. Gupta Verlag


Climate change and rubber economy – How can natural rubber be part of the climate change actions?

The International Rubber Study Group (IRSG) in collaboration with CIFOR/FTA, CIRAD and the International Rubber Research and Development Board (IRRDB) has organised a workshop on “Climate Change and Natural Rubber Systems” to review scientific knowledge about impacts of climate change on natural rubber (NR), potential means for its adaptation and what can be its contribution to mitigation of climate change. The overall purpose was to take stock of what is known, identify gaps and areas for research and action.


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Renewable Carbon – Alternative carbon sources for the chemical and plastics industry

All fossil carbon is prone to end up, mainly as CO2, in the atmosphere sooner or later. In order to fight climate change, consumption of fossil resources needs to be curbed. In the energy sector “decarbonisation” strategies are being implemented to end the use of fossil carbon. In the chemical and plastics industries the equivalent to decarbonisation would be a transition to renewable carbon. To shed a light on this strategy, nova-Institute has published a comprehensive background paper on renewable carbon. The twelfth edition in the nova-Paper series outlines the cornerstones of the transition from fossil carbon to renewable carbon for all organic chemicals and materials.


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Historical study on Continental’s role in the Third Reich – The company was a pillar of the National Socialist armaments and war economy

In an independent academic study presented on 27 August 2020, Continental has undertaken a comprehensive review of the company’s involvement with the German National Socialist regime. The study traces in detail how Continental became a pillar of the National Socialist armaments and war economy and at the same time benefited economically from the regime’s mobilisation and armament policy. The broad-based study entitled “Zulieferer für Hitlers Krieg. Der Continental-Konzern in der NS-Zeit” (Supplier to Hitler’s War. The Continental Group in the Nazi Era)” was conducted by historian Prof. Paul Erker (LMU Munich), who is a renowned expert on corporate history in the Nazi era. The study pursues the conceptually innovative approach of the “virtual corporation” by including those companies that were not yet part of today’s Continental in the period under review, i.e. Teves, VDO, Phoenix and Semperit.


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Without thermal chamber – Fraunhofer LBF develops dynamic plastics testing even at low temperatures

Plastics behave dependent on temperature and strain rate. When designing components, it is therefore important to know the behaviour of the plastic used, not only under laboratory conditions, but also under the subsequent conditions of use. The entire spectrum of possible temperatures must be considered. To this end, scientists at the Fraunhofer Institute for Structural Durability and System Reliability LBF have expanded the dynamic possibilities at the institute’s own modified high-speed testing machine with a device that enables plastics to be examined even at low temperatures – validated down to -40 °C – without a thermal chamber.


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Five days packed with foam, adhesive and bonding innovations – Virtual double event Foam Expo Connect and Adhesive & Bonding Expo Connect

During five days packed with innovation, more than 2,500 foam, adhesive and bonding professionals from leading supply chain and OEM organizations connected. From 24 – 28 August 2020 industry experts had the chance to hold meetings, attend conference sessions, discuss opportunities, share ideas, and conduct business.


Certified compounds for use in the gas industry – Gummiwerk Kraiburg compound generation in line with DVGW standards

Approval from a competent institution is required for seals and membranes used in sensitive areas such as gas supply. Gummiwerk Kraiburg offers elastomer compounds for the gas industry which are certified according to the DIN (German Institute for Standardization) standards EN 549 and EN 682. The certifications confirm that the compound generations meet the requirements for use in gas supply as well as in gas devices and systems.


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Scientific exchange in times of Corona – 30th International Colloquium Plastics Technology of the IKV

The International Colloquium Plastics Technology 2020 marked both an anniversary and a premiere. It was the 30th time that IKV’s wide range of research topics was presented at a colloquium, but for the first time – due to the corona pandemic – in digital form. Main topics were circular economy, industry 4.0 and additive manufacturing.


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Preview to Chinaplas 2021 – “New Era – New Potential – Innovation for Sustainability”

The 34th edition of Chinaplas has been rescheduled to 13 – 16 April 2021, at a new venue – Shenzhen World Exhibition & Convention Center. The trade fair will from 2021 on alternate between Shenzhen (odd years) and Shanghai (even years). Chinaplas organiser Adsale Exhibition Services Ltd. held a press conference on 23 June to give an outlook to the event 2021. Stanley Chu, Chairman of Adsale, Ada Leung, General Manager of Adsale, and Norris Chu, Project Director of Adsale, announced updates about the trade show and discussed post-pandemic opportunities in the plastics and rubber industries.


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The EU Circular Economy Package and Plastics Strategy – An overview and what they mean for bio-based plastics

Very few policy initiatives in the last few years have received as much public attention as the recently adopted Single-Use Plastics Directive – also known as the single-use plastics ban. This legal act, however, is only one piece of the puzzle with which the European Union is attempting to curb plastic littering and transform the European economy into a circular one. The following article gives an overview on the EU Circular Economy Package and Plastics Strategy and explains what they mean for bio-based plastics.


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New modified silica for optimized tire tread development

In addition to high performance targets for tires, modern car tread development places increasing value on problem-free and resource-saving processing. In the course of the introduction of silica mixtures and their optimization over the past 25 years, the processability of the increasingly filled mixtures became more difficult and more energy intensive. The next step in improving both tire performance and compound processing is the fundamental chemical redesign of the raw materials rubber and filler. This article shows ways to significantly improve both the technical performance and the processing of tread compounds and to reduce resource consumption by using optimized surface-modified silica.


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Access to compound extrudability by using a 5-finger die – Application of standardized test formulations

Body sealing profiles are highly sophisticated in terms of lip forming and overall extrusion process. Especially the introduction of electrical isolating compounds has increased the demands in this area. The work presented in this paper proposes and describes a lab method to get access to the extrudability of compounds by means of lip shaping: the use of a 5-finger die, where the five lips have an increasing degree of difficulty, and also represent the variety of thin profile lips in sealing profiles. The sensitivity of the methodology is demonstrated by applying model compounds derived from ISO 4097 EPDM polymer testing standard. The standard is slightly modified for the curatives and more relevantly for the flow properties in adding a variation of type and amount of white filler into the recipe. On one hand this represents the need of the market for cost effective recipes. But also, the necessity to compound with low carbon black loadings in order to meet electrical isolating properties requires smart compounding with specific fillers. In total, that compounding approach leads to flow characteristics substantially different from conventional compounds, worth to be analyzed. In order to mirror the derived 5-finger die results to other existing methods, frequency sweep investigations by using an RPA on the model compound, a DoE study is conducted. If the 5-finger die results are summarized into a single number (like a cost function) a general correlation to delta-delta or shear thinning of the complex viscosity curve can be demonstrated.


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Methods for simultaneous dynamic-mechanical and dielectric analysis – Part 3: Dielectric investigation of elastomer composites under dynamic deformation

Elastomer materials are often reinforced with electrically conductive fillers such as carbon black. The carbon black structures in the rubber matrix change under mechanical deformation and can therefore be used as “markers” for condition monitoring of elastomer components. Dielectric analysis is a suitable method for measuring this effect. In order to be able to use it for this purpose, it is necessary to know the exact correlation between the mechanical and dielectric properties of the material. The key to understanding this correlation lies in the use of simultaneous dynamic-mechanical and dielectric analysis, which is presented here in a three-part series.

Part 1 (RFP 01 2020) dealt with the influence of a defined static mechanical deformation on the dielectric spectra of a carbon black filled hydrogenated acrylonitrile butadiene rubber (HNBR). Part 2 investigated the temperature influence on the dielectric spectra of a carbon black filled HNBR under static mechanical deformation (RFP 02 2020). The concluding third part of this series presented here, deals with the influence of dynamic-mechanical deformation on the dielectric spectra of a carbon black-filled styrene butadiene rubber (SBR) under dynamic-mechanical deformation. A Diplexor 500 N from Netzsch Gerätebau GmbH was used for these investigations.


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Efficient testing and development of a visco-elasto-plastic material model for thermoplastic elastomers

Thermoplastic elastomers (TPE) show a strong non-linear material behaviour in combination with a stress softening after initial loading and a high residual deformation after unloading. This material property depends on the stress state as well as on the temperature. In order to consider this characteristic during the design and development of TPE parts, suitable material models have to be developed. An isotropic and incompressible TPE was used to develop a visco-elasto-plastic material model based on generally known material models. The calibrated model was validated on a sealing ring in order to show the deficits of the generally known materials. Furthermore, the dependence of the material parameters on the stress state and temperature was investigated to develop an efficient test plan for the calibration of the material model.


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