PVC Boards

From CAMEO
Jump to: navigation, search

Description

Lightweight rigid or flexible* foamed boards made of Polyvinyl chloride. Most have sandwich-like structures of smooth outer skin and interior fine-cell foam.

<bigExamples of various foam boards and their characteristics are presented below:></big>

Product name Company Color Density Shore
hardness
Max service
temp (deg C)
Coefficient
of linear
expansion
(mm/m-k)
 % water
absorption
Min:Max
thickness (mm)
Oddy Test Result Comments
FOREX® Classic 3A Composites white 0.7 40-44 55 0.07 <1 2:19 Pass (British Museum 2013) standard product; PE film on one side
FOREX® Print 3A Composites white 0.5 >32 55 0.07 <1 2:19 Pass (British Museum 2010) more economical; less rigid and resistant; PE film on one side
FOREX® Color 3A Composites 9 colors 0.6 37 55 0.05 <1 3:8
(10, 19 black)
Pass (British Museum 2013) cannot be used outdoors; PE film on one side
KomaCel® Kommerling 0.55-0.7 55-77 56 <0.08 <0.2 4:30 Pass (British Museum 2012) standard product
KomaTex® Kommerling w/b ~0.6 48-55 60 <0.08 <0.3 - 3.0 1:25 (white)
2:19 (black)
Pass/Temp (IMA 2016)
Fail (MMA 2018)
Fail (MMA 2019)
free foamed sheet, (no outer skin)
KomaLite® Kommerling w/b 0.5 58 3:6 NA more economical form of KomaTex
Sintra 3A Composites 9 colors 0.5-0.9 46 1:12.7 Pass (British Museum 2011)
Pass (Brooklyn Museum 2011)
Pass/No Contact (Autry 2011)
Pass (NHM 2012)
Pass (CMA 2012)
Fail (Auttry 2014)
Fail (IMA 2016)
Temp (MMA 2018)
standard product, low gloss; has two release liners - one on each side
Sintra Vers
(formerly ePVC)
3A Composites w/b 3:6 NA more economical and versatile
Sintra Construct 3A Composites w/b 6:19 NA designed for fabrication
Celtec 0.58 55 Fail (Autry 2014)
Temp (Autry 2015)
Fail (Autry 2015)
Fail (MMA 2018)

Synonyms and Related Terms

foam sheet; foam board

Applications

  • Graphic substrates (signs)
  • Case interior elements: mount making (risers, fabric wrapped backers, decks), labels
  • Storage: open shelves, trays (not in proximity to sensitive objects)

Personal Risks

  • Harmful to health when inhaling or ingesting dust and vapors during unpacking, sawing, grinding and thermoforming.
  • Ensure good ventilation and dust extraction on processing machines and at other places where dust may develop.
  • Hazardous thermal decomposition products: Hydrochloric acid (HCl), Carbon dioxide (CO2), Carbon monoxide (CO)

Collection Risks

  • Some PVC board products pass the Oddy test, while some fail.
  • Some PVC boards pose risk to sulfide-sensitive materials and possibly to materials sensitive to acetic acid.
  • Greg Smith and Michael Samide report that some rigid, unplasticized PVC construction boards give off a sulfur containing heat stabilizer (2-ethylhexyl thioglycolate [2-EHTG]) that can tarnish silver (publication forthcoming). However, they also reported finding several specific brands of PVC construction board, namely Komacel (Kommerling) and e-PVC (3A Composites) are safe for use in exhibition casework as they do not contain 2-EHTG.
  • KomaCel is more recently approved for permanent use (vs KomaTex). KomaTex has a heat stabilizing component which leaches out over time.

Physical and Chemical Properties

  • PVCs are generally fire resistant.
  • Not biodegradable but may be recycled in some locations.

Working Properties

Properties of the same product can change over time and may depend on geography.

Can be cut, machined, and joined. Takes acrylic paint relatively well.

To join:

  • Mechanical fasteners (screws)
  • Tetrahydrofuran (solvent weld): need proper extraction, PPE; quick and fast, not much clean up, perhaps more solid bond than 3M epoxy
  • Adhesive: 3M DP605 2 part epoxy - may need to score or rough up smooth surfaces to get good adhesion

Wood, acrylic, and fabric can be adhered to PVC boards:

  • Laminated acrylic to PVC: 3M Scotch-Weld DP605NS two-part epoxy (good for heavier, stronger decks because acrylic has tapping properties
  • Fabric to PVC: ATG 695: Instabond C (double-coated polyester film), 3M 465 Clear Tape

To prevent open-celled edges from showing:

  • Spackle edge before painting
  • Cut at 45 deg angle and miter join
  • Mechanically fasten L angle frame around it so the edge is covered

Fairly rigid, but will sag; not intended to be a weight-bearing substrate. Thus, need for supports like U channels or ribs.

Take DTS (direct to substrate) inks really well.

Presence and number of protective release liners may be used to quickly identify products (i.e. Sintra always has two liners).

Forms and Sizes

  • Most come in full sheet sizes (4x8 feet), usually available in at least white and black. Check product brochures/table for specific info on colors, finishes, sizes available.
  • Need a trusted supplier that does not fill orders with multiple products.

Resources and Citations

  • Canosa et al. (Swedish National Heritage Board), Characterization of Emissions from Display Case Materials, 2019, Link
  • Samide and Smith, “Assessing the Suitability of Unplasticized Poly(Vinyl Chloride) for Museum Showcase Construction,” JAIC, 2020.
  • Samide, Liggett, Mill and Smith, “Relating volatiles analysis by GC–MS to Oddy test performance for determining the suitability of museum construction materials,” Heritage Science 6 (47), 2018.
  • Samide and Smith, “Analysis and quantitation of volatile organic compounds emitted from plastics used in museum construction by evolved gas analysis–gas chromatography–mass spectrometry,” Journal of Chromatography Aug/Sept 2015.