BAYMOD® N XL 38.43
HIGH PERFORMANCE
MODIFIER FOR FRICTION PARTS
nbr.arlanxeo.com

BAYMOD® N XL 38.43
HIGH PERFORMANCE MODIFIER FOR FRICTION PARTSARLANXEO is a leading supplier of powder products forthe modification of parts for friction applications.
Baymod® N XL 38.43 is a polar pre-crosslinked acrylo­
nitrile-­­butadiene ­copolymer in very fine powder form,
which was especially developed and tailor-made for themodification of phenolic resins and the improvement of­friction articles such as brake pads and clutch facings.

Baymod® N XL 38.43 serves as a ready-to-use modifier
which brings elasticity and improves the impact resistanceof the final product. Consequently, fade (stopping p­ owerreduction) and noise are reduced, while grip and thus
­coefficient of friction are improved, and service lifetime is­increased.

Baymod N XL 38.43®

115 MU38%
100 µmCaCO3
10%

Improvement of the impact resistance of­phenolic resins by adding Baymod® N XL 38.43

The exceptionally fine powder form of Baymod® N XL
38.43 (the lowest particle size powder in the NBR powder­market), together with the regular spherical shape of the­particles, enable, in dry p­ rocesses, a very h­ omogeneous
mix with phenolic resins and other ingredients used in­friction c­ ompounds, which c­ onsequently gives outstanding­properties to the final a­ rticles.
The shape and size of the particles is a result of thespray-drying technology used to produce Baymod® N XL
38.43. Microscopic comparison with standard ground NBR
powder confirms these differences.

30

25Impact ­resistance (kJ/m2)

Pre-crosslinked spray-dried NBR
Mooney viscosity (1+4) 100 °C
ACN content
Average particle size
Partitioning agent
Partitioning agent content

The pre-crosslinked structure of Baymod® N XL 38.43­
allows a significant reduction or even the complete ­removalof the sulfur-curing step, which means less handling ofchemicals, and therefore a safer working environment,­­better storage ­stability of pre-mixes and savings throughthe reduction of production stages (even all-in-one mixes
are possible).

2015105005101520Baymod® N XL 38.43 (weight %)100 µm

WD 8.6 mm

Ground NBR powder

100 µm

WD 8.7 mmBaymod® N XL 38.43

The particle size allows an effective distribution, low heatbuild-up during mixing and shorter mixing times.
The excellent free flowing properties of Baymod® N XL
38.43 allows automatic metering and processing.
2The main purpose of a friction material is to stop the vehicle
by converting mechanical energy smoothly and in a controlled fashion into heat. In practice, brake units can heat
up to such an extent that heat dissipation may become aproblem. Friction materials should have a stable coefficientof friction suitable for the application. This should remain
constant throughout the material’s life under all conditionsof temperature and pressure. The coefficient of friction isthe key property of friction linings and pads. Baymod® N XL
38.43 increases the coefficient of friction in the temperature
range of 50 °C to 200 °C, where most braking action starts
to take place.

Product benefits

Process benefits

Perfect compatibility and miscibility
with phenolic resins
Best impact (+40%) and heat (+20°C) resistance,compared to SBR, standard NBR, BR and tire scrap
Flexibility, grip and coefficient of friction improved
Increased resistance to grease, oil, fuel,tear and wear
Chloride-free product
Fade and noise reduction
Increased service life and quality of friction
safety parts

Enables automatic, short and all-in-one mixes
Low heat build-up and waste level
Lower consumption of energy and cooling waterHigh green strength and storage s­ tabilityof ­premixed compounds
Less (or even no) handling of ­sulfur
curing chemicals
Fewer production stages and costs savings

Coefficient of friction
No NBR

With NBR

0.8

0.8

0.7

0.7

0.6

0.6

0.5

0.5

0.4

0.40.3

0.3

0.2

0.2

0.1

0.1

0.00100

2003004000.00100

Temperature (°C)

200300400

Temperature (°C)

Ageing behavior after 2 days @ 110 °C

80

Mooney Evolution(Values & %)Safety and reliability are key requirements for brake andclutch lining applications for which acrylonitrile-­butadiene
copolymers are essential components in mixtures­­containing phenolic resins and various other inorganic andorganic ingredients. B­ aymod® N XL 38.43 is an effective
co-binder, providing, among all rubber materials, the best
chemical ­compatibility and miscibility with phenolic r­esins,
to increase the flexibility of friction materials. Rubber is­also effective as a material that encapsulates the abrasive­powders, thereby decreasing wear of the metal rotor.

6040200The outstanding ageing resistance of Baymod N XL 38.43
compared with other powdered NBR products on the m­ arket
gives an improved retention of safety critical p­ roperties forfriction materials operating at high temperatures, leading toa more constant service life performance.
®

- 20Baymod® Competitor Competitor Competitor Competitor
N XL 38.43
1234∆ Mooney Units∆ Mooney Values (%)

3

Edition 2019
© 2019 ARLANXEO. All rights reserved.

EMEA
ARLANXEO Deutschland GmbHHigh Performance Elastomers
Dormagen, Germany
nbr.emea@arlanxeo.com
APAC
ARLANXEO High Performance Elastomers(Changzhou) Co. Ltd. Shanghai BranchHigh Performance Elastomers
Shanghai, P.R. China
nbr.apac@arlanxeo.com
NAFTA
ARLANXEO USA LLC
High Performance Elastomers
Pittsburgh PA, USA
nbr.nafta@arlanxeo.com
LATAM
ARLANXEO Brasil S.A.
High Performance Elastomers
São Paulo, Brazil
nbr.latam@arlanxeo.com

Quality & Environmental Management:
ARLANXEO NBR is produced under strict control regarding safety, environmental protection and quality. The supply chain, from production to customer service, is covered by ISO9001, ISO 14001 and ISO 50001 certification.
Product Safety:
Relevant safety data and references as well as the necessary hazard warning labels can befound in the Material Safety Data Sheet.
Health and Safety Information:
Appropriate literature has been assembled which provides information concerning the health and safety precautions that must be observed when handling the A­ RLANXEO productsmentioned in this publication. For materials mentioned which are not ARLANXEO products, appropriate industrial hygiene and other ­safety p­ recautions r­ecommended by theirmanufacturers should be followed. ­Before w­ orking with any of these products, you must
read and become familiar with the available i­nformation on their hazards, proper use andhandling. This cannot be overemphasized. I­nformation is available in several forms, e.g.,material safety data sheets and ­product labels. Consult your ARLANXEO representative orthe Health, Safety, ­Environment and Quality Department (HSEQ) of ARLANXEO.
Regulatory Compliance Information:
Some of the end uses of the products described in this publication must comply with applicable regulations. If you have any questions on the regulatory status of these products,
contact your ARLANXEO representative.
The manner in which you use and the purpose to which you put and utilize our products,
technical assistance and information (whether verbal, written or by way of production
evaluations), including any suggested formulations and recommendations, are beyond ourcontrol.
Therefore, it is imperative that you test our products, technical assistance and i­nformation
to determine to your own satisfaction whether they are suitable for your intended uses andapplications. This application-specific analysis must at least ­include testing to determine
suitability from a technical as well as health, safety, and environmental standpoint. Such
testing has not necessarily been done by us. Unless we otherwise agree in writing, allproducts are sold strictly pursuant to the terms of our standard conditions of sale, which
can be found at the ARLANXEO homepage. All information and technical assistance isgiven without warranty or guarantee and is subject to change without notice. It is expressly
understood and agreed that you assume and hereby expressly release us from all liability,in tort, contract or otherwise, incurred in connection with the use of our products, technicalassistance and information.
Any statement or recommendation not contained herein is unauthorized and shall not bindus. Nothing herein shall be construed as a recommendation to use any product in conflictwith patents covering any material or its use. No license is implied or in fact granted under
the claims of any patent.