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Since it has been claimed to be the cause of 'sick building syndrome' and chemical hypersusceptibility, indoor air pollution due to low-level emissions of chemical substances, or volatile organic compounds
(VOC), from modern building materials become a major issue of public concern in recent years. In line with the revised Building Standards Law, which is to be put into force on 1 July 2003, the revised
JIS (Japanese Industrial Standards) were issued at the end of March 2003. Introduced below is the Riken Resin FC series, F0.3-compatible absorbing agents that mainly target formaldehyde, newly developed
in view of the restricted use of formaldehyde and chlorpyrifos, the first two VOC of the 14 specified items.
1. Types of formalin-absorbing agents
Riken Resin FC series: characteristics
| Product name |
Appearance |
Solid content |
pH |
| Riken Resin FC-100 |
Transparent, colorless liquid |
6% |
6.5 ± 0.5 |
| Riken Resin FC-200 |
Transparent, colorless liquid |
7% |
8.5 ± 0.5 |
| Riken Resin FC-350P |
Fluorescent liquid |
18% |
8.5 ± 0.5 |
| Riken Resin FC-460 |
Transparent, colorless liquid |
34% |
7.3 ± 0.5 |
| Riken Resin FC-480 |
Transparent, colorless liquid |
32% |
8.3 ± 0.5 |
Riken Resin FC series: types
| Product name |
Usage |
Application |
| Riken Resin FC-100 |
Undiluted |
Plywood |
| Riken Resin FC-200 |
Undiluted |
Rock and glass wool |
| Riken Resin FC-350P |
1:2 dilution |
Fiberboards and other materials that require good penetration |
| Riken Resin FC-460 |
1:2 dilution |
Plywood |
| Riken Resin FC-480 |
1:2 dilution |
FC-460-based, with enhanced penetration |
Riken Resin FC series: features
| (1) |
Used even in small quantities, it removes formaldehyde and acetaldehyde through excellent trap properties. |
| (2) |
It causes minimal metal corrosion. |
| (3) |
The FC-460 series has a cost advantage as used in 1:2 solution with water. |
| (4) |
FE-350P is excellent in penetration. |
2.Performance of formalin-absorbing agents
2-1. Formalin-absorbing properties of FC-460 (in plywood)
I.Comparison by dilution ratio
Conditions/
| Amount used: |
3g/shaku2 (1 shaku = approx. 0.303m), applied on the reverse side |
| Drying: |
80°C x 5min. |
II.Comparison by plywood thickness and quantity applied 
Conditions/
| Composition: |
1:2 dilution, applied on the reverse side |
| Drying: |
80°C x 5min. |
III.Comparison by plywood thickness
Conditions/
| Composition: |
1:2 dilution |
| Amount used: |
3g/shaku2 (1 shaku = approx. 0.303m), applied on the reverse side
|
| Drying: |
80°C x 5min. |
IV.Alteration of formaldehyde diffusion in air over time
Conditions/
| Composition: |
1:2 dilution |
| Amount used: |
3g/shaku2 (1 shaku = approx. 0.303m), applied on the reverse side
|
| Drying: |
80°C x 5min. |
V.Comparison by the kind of plywood
Conditions/
| Composition: |
1:2 dilution |
| Amount used: |
3g/shaku2 (1 shaku = approx. 0.303m), applied on the reverse side
|
| Drying: |
80°C x 5min. |
2-2.Formalin-absorbing properties of FC-350P (particleboard, fiberboard)
I.Performances on particleboards with different thicknesses
Conditions/
| Composition: |
1:2 dilution, spray application |
| Drying: |
80°Cx 5min.
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Sanding after application and drying
| Amount applied: |
20mm M-type = 12g/shaku2, one side only |
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12-30mm U-type = 5 g/shaku2, one side only
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II.Fiberboards (MDF) 
Conditions/
| Composition: |
1:2 dilution |
| Amount used: |
3g/shaku2 (1 shaku = approx. 0.303m), applied on one side only
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| Drying: |
80°C x 5min. |
Developer's comments
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'I think the advantage of using formalin-absorbing agents is now widely recognized, seeing the great response we have received from the building and other industries.'
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K. Nakagawa,
executive manager of Mikiriken Industrial |
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'We are hoping these effective products will be spread not only in Japan but also on a global scale.' |
Y. Nakai,
the adhesives group of Mikiriken Industrial |
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