Editing Syntactic foam (section)

==Characteristics==
Tailorability is one of the biggest advantages of these materials.<ref>{{cite journal|last=Bardella|first=L.|author2=Genna F. |title=On the elastic behavior of syntactic foams|journal=International Journal of Solids and Structures|year=2001|volume=38|issue=2|pages=7235–7260|doi=10.1016/S0020-7683(00)00228-6}}</ref> The matrix material can be selected from almost any metal, polymer, or ceramic. Microballoons are available in a variety of sizes and materials, including [[glass microsphere]]s, [[cenosphere]]s, [[carbon]], and polymers. The most widely used and studied [[foam]]s are glass microspheres (in epoxy or polymers), and cenospheres or ceramics<ref>{{cite journal|last=Shubmugasamy|first=V.|title=Compressive Characterization of Single Porous SiC Hollow Particles|journal=JOM|year=2014|volume=66|issue=6|pages=892–897|doi=10.1007/s11837-014-0954-7|bibcode=2014JOM....66f.892S|s2cid=40553878}}</ref> (in aluminium). One can change the volume fraction of microballoons or use microballoons of different effective density, the latter depending on the average ratio between the inner and outer radii of the microballoons.

A manufacturing method for low density syntactic foams is based on the principle of buoyancy.<ref>{{cite journal |first1=Md Mainul |last1=Islam |first2=Ho Sung |last2= Kim |title=Manufacture of syntactic foams: pre-mold processing |journal=Materials and Manufacturing Processes |volume=22 |pages=28–36 |date=2007 |doi=10.1080/10426910601015857 |s2cid=136610096 |url=https://research.usq.edu.au/download/b194f80efe12906b67f2ea94130e29f635cffffe3a4088825651d266fba4de60/8262727/Islam_Kim_MMP_v22n1_Author_Post-print.pdf}}</ref><ref>{{cite journal |first1=Md Mainul |last1=Islam |first2=Ho Sung |last2=Kim |title=Manufacture of syntactic foams using starch as binder: post-mold processing |journal=Materials and Manufacturing Processes |volume=23 |issue=8 |pages=884–892 |date=October 2008 |doi=10.1080/10426910802413661|s2cid=138333688 |url=http://eprints.usq.edu.au/4592/2/Islam_Kim_MMP_v23n8_Author_version.pdf }}</ref>

===Strength===
The [[compression (physics)|compressive]] properties of syntactic foams, in most cases, strongly depend on the properties of the filler particle material. In general, the [[compressive strength]] of the material is proportional to its density. Cementitious syntactic foams are reported to achieve compressive strength values greater than {{cvt|30|MPa|ksi}} while maintaining densities lower than {{cvt|1.2|g/cm3|oz/in3}}.<ref>{{cite journal |doi=10.1016/S0263-8223(03)00060-6 |title=Hygrothermal studies on syntactic foams and compressive strength determination |author1=Gupta, Nikhil |author2=Woldesenbet, Eyassu |date=September 2003 |volume=61 |issue=4 |pages=311–320 |journal=Composite Structures}}<!--URL: https://d1wqtxts1xzle7.cloudfront.net/75413366/s0263-8223_2803_2900060-620211130-29259-15hzmp6-libre.pdf--></ref>

The matrix material has more influence on the [[tension (physics)|tensile]] properties. [[Tensile strength]] may be highly improved by a chemical surface treatment of the particles, such as [[silanization]], which allows the formation of strong bonds between glass particles and epoxy matrix. Addition of fibrous materials can also increase the tensile strength.{{Citation needed|date=August 2012}}