Chopped Fiberglass for Polyamides (PA)
Fiberglass chopped strands for the reinforcement of polyamides (standard and specialty PA, but also PPA and PPS) contain a specially designed sizing. Choosing the right sizing, which is a thin coating applied to the fiberglass, is most critical to meet the requirements of downstream thermoplastic part manufacturing, such as high dry-as-molded properties for general purpose, excellent aging and superior fatigue after long-term aging in ethylene glycol and water, and superior dry-as-molded mechanical properties for food contact and drinking water applications.
Karin Demez
Global Portfolio Leader
"Selecting the right fiberglass chopped strands with the best suitable sizing, which has to secure an excellent bonding with the PA6 and PA66 polymer matrix, is critical. Johns Manville's ThermoFlow® chopped strands exhibit exceptional strand integrity, reduced fines content, improved flow and reliable and consistent extruder feeding, and safeguard a uniform fiber distribution. All to increase productivity of the compounding process and the final material performance."
What are fiberglass chopped strands?
Fiberglass chopped strands are produced from continual E-glass fibers, which are chopped to the length of usually 4 mm. They are used to reinforce amorphous or thermoplastic resins. Fiberglass chopped strands are compounded on extruders while the resulting compounds are afterwards injection molded.
The mechanical properties can be measured as follows:
Tensile strength, tensile modulus, elongation, flexural strength and flexural modulus on Zwick Roell 2020 according to ISO 527-2 and ISO 178.
Charpy unnotched and notched on Resil Impactor according to ISO 179/1eU and 179/1eA.
Sona Kurtanska
Product Development Engineer
"Did you know that JM is capable of modifying ThermoFlow® chopped strands in terms of micronage (10 µm and 13 µm), and length of the bundles according to the compounders' requirements? We offer also densified and non-densified versions. Our latest product development, ThermoFlow® 675, was specifically developed for excellent aging and superior fatigue after long-term aging in ethylene glycol and water."
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Johns Manville's Engineered ProductsJohns Manville Engineered Products manufactures fiberglass in Europe and North America and offers chopped strand and roving to a variety of applications to extend the capabilities of thermoplastics and thermosets, and to reinforce gypsum boards. -
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