Carboxylated Terpolymer Latex
Ignition Resistance Performance
Safety & Handling Considerations
Applications
XU 36502 Experimental Latex is part of Dow’s HPL™ Latex family of the high-performance ignition resistant latexes.
HPL™ latexes offer properties not available in standard styrene-butadiene latexes. HPL latex products have chlorine content reacted into the backbone of the polymer that provides a "built in" level of ignition resistance. This inherent ignition resistance enables the formulator to displace some or all of the alumina trihydrate (ATH) with less costly calcium carbonate filler which may result in substantial compound cost savings. The presence of chlorine in the polymer backbone also allows the use of an antimony synergist without the addition of expensive additives.
HPL latexes are used in the precoat compound for both commercial and residential carpet backing applications. HPL latexes are also used in unitary and tile backing applications.
Benefits
High Solids
Ignition Resistant
Blister Resistant
Medium Hand
Typical Latex Properties1
| Property |
Value |
| Solids |
57%
|
| Particle Size |
1250 Å |
| pH |
7 |
| Glass transition temperature (Tg) |
9.5°C |
| Minimum film formation temperature (MFFT) |
48.2°F |
| Brookfield viscosity |
300 cPs (#2 @ 50 rpm) |
| Specific Gravity |
1.08 |
| Carboxylation level |
low |
1 Not to be construed as specifications.
Additional Information
Technical Data Sheet (53KB PDF)
Dow Emulsion Polymers Storage and Handling Guide (2.2MB PDF)
Contact Us for SDS Information.
Ignition Resistance Performance
The test method described in ASTM D2863 is used to determine the ignition resistance of a plastic material. Oxygen Index (OI) is defined as the minimum oxygen concentration required to support candle-like combustion of plastics. In general, a higher oxygen index indicates better ignition resistance properties.
The oxygen index of compound films made with various substitution levels of ATH for calcium carbonate using both standard SB latex and VSB latex can be used to compare ignition resistant formulations. Figure #1 illustrates the impact of ATH level and latex type on OI in typical 600 Load precoat compound films. The use of an antimony synergist further improves the ignition resistance of the compound.
Figure 1
Safety & Handling Considerations
Observation of reasonable care and cleanliness should avoid exposure problems in the handling of Dow latexes. While exposure to most latex products is a relatively low hazard to personnel, the best practice is to avoid human contact and to have workers wear the appropriate personal protective equipment per the product safety data sheet.
Dow latexes contain a biostat to prevent microbial growth when the product is shipped. Latexes are, however, an ideal nutrient medium for microbes, which can grow if conditions are suitable. To limit contamination by airborne microbes, tank hatches and covers should generally be kept closed. A bulk storage system should be cleaned on a regular basis. Generally, a six-month to one-year cleaning frequency is sufficient.
All Dow latexes are filtered during processing. They are also filtered just prior to loading. However, most latexes are excellent film formers and may develop skins or particles during shipping and storage. During storage, a skin layer usually forms on the surface of the latex exposed to air and acts as a floating cover that rises and falls with the level of the latex. Periodic circulation with jet-mixing has been shown to minimize this floating layer as well as skin formation on the walls. Skins and residue can be removed by filtering the latex just prior to use in the production plant. Latexes must be protected against freezing and against extended exposure to temperatures above 100ºF. The desired storage temperature is 40 – 90ºF. Most Dow latexes are storage stable with a shelf life of at least six months. During periods of extended storage, latex may show tendencies to stratify (layer) or pH drift. Such tendencies are accelerated by storage at elevated temperatures. Stratification does not impact latex quality, and periodic recirculation of the latex in the storage tank usually prevents such separation. Occasionally, with long-term storage, a downward drift in pH might be observed and could indicate a product performance change. Latex performance can also be affected by cross contamination with other products or raw materials. Contact your Dow sales representative for assistance if necessary.
NOTICE: Any products with the prefix "XU", "XZ", "XQ", or "XG" are experimental and may not become available for commercial sale. No freedom from any patent owned by Dow or others is to be inferred. Because use conditions and applicable laws may differ from one location to another and may change with time, recipient is responsible for determining whether products and the information in this document are appropriate for recipient’s use and for ensuring that recipient’s workplace and disposal practices are in compliance with applicable laws and other governmental enactments. Dow assumes no obligation or liability for the information in this document. NO WARRANTIES ARE GIVEN; ALL IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR USE FOR A PARTICULAR PURPOSE ARE EXPERSSLY EXCLUDED.
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