Product description
Methyl ethyl ketone peroxide, solution in dimethyl phthalate
Specifications Characteristics
Due to the relatively unstable nature of organic peroxides a loss of quality can be detected over a period of time. To minimize the loss of quality, Akzo Nobel recommends a maximum storage temperature (Ts max.) for each organic peroxide. For Butanox M-50 Ts max. = 25°C
When stored under the recommended storage conditions, Butanox M-50 will remain within the Akzo Nobel specifications for a period of at least three months after delivery.
Thermal stability
Organic peroxides are thermally unstable substances, which may undergo self-accelerating decomposition. The lowest temperature at which self-accelerating decomposition of a substance in the original packaging may occur is the Self-Accelerating Decomposition Temperature (SADT). The SADT is determined on the basis of the Heat Accumulation Storage Test. For Butanox M-50 SADT
The Heat Accumulation Storage Test is a recognized test method for the determination of the SADT of organic peroxides (see Recommendations on the Transport of Dangerous Goods, Manual of Tests and Criteria - United Nations, New York and Geneva).
Major decomposition
Carbon dioxide, Water, Acetic acid, Formic acid, Propanoic acid, Methyl
products Packaging and
The standard packaging is a 30 l HDPE can (Nourytainer®) for 30 kg
transport
peroxide solution. In Asia Pacific the standard packaging is a 30 l HDPE can for 20 kg peroxide solution. Both packaging and transport meet the international regulations. For the availability of other packed quantities contact your Akzo Nobel representative. Butanox M-50 is classified as Organic peroxide type D; liquid; Division 5.2; UN 3105; PG II.
Safety and handling
Keep containers tightly closed. Store and handle Butanox M-50 in a dry well-ventilated place away from sources of heat or ignition and direct sunlight. Never weigh out in the storage room. Avoid contact with reducing agents (e.g. amines), acids, alkalis and heavy metal compounds (e.g. accelerators, driers and metal soaps). Please refer to the Material Safety Data Sheet (MSDS) for further information on the safe storage, use and handling of Butanox M-50. This information should be thoroughly reviewed prior to acceptance of this product. The MSDS is available at www.akzonobel-polymerchemicals.com.
Applications Butanox M-50 is a general purpose methyl ethyl ketone peroxide (MEKP) for the curing of unsaturated polyester resins in the presence of a cobalt accelerator at room and elevated temperatures. The curing system Butanox M-50/cobalt accelerator is particularly suitable for the curing of gelcoat resins, laminating resins, lacquers and castings; moreover the manufacture of light resistant parts may be possible contrary to the curing system benzoyl peroxide/amine accelerator. Practical experience throughout many years has proven that by the guaranteed low water content and the absence of polar compounds in Butanox M-50, this peroxide is very suitable in GRP products for e.g. marine applications. For room temperature application it is necessary to use Butanox M-50 together with a cobalt accelerator (e.g. Accelerator NL-49P).
Depending on working conditions, the following peroxide and accelerator dosage levels are recommended: Butanox M-50
In a high reactive standard orthophthalic resin in combination with Accelerator NL-49P (= 1% cobalt) the following application characteristics were determined: Gel times at 20°C 2 phr Butanox M-50 + 0.5 phr Accelerator NL-49P
2 phr Butanox M-50 + 1.0 phr Accelerator NL-49P
Cure of 1 mm pure resin layer at 20°C The speed of cure is expressed as the time to reach a Persoz hardness of respectively 30, 60 and 120 s. Persoz:
2 phr Butanox M-50 + 0.5 phr Accelerator NL-49P
2 phr Butanox M-50 + 1.0 phr Accelerator NL-49P
Cure of 4 mm laminates at 20°C 4 mm laminates have been made with a 450 g/m2 glass chopped strand mat. The glass content in the laminates is 30% (w/w). The following parameters were determined: - Time-temperature
- Speed of cure expressed as the time to achieve a Barcol hardness
- Residual styrene content after 24 h at 20°C and a subsequent postcure
2 phr Butanox M-50 + 0.5 phr Accelerator NL-49P 13
2 phr Butanox M-50 + 1.0 phr Accelerator NL-49P 8
2 phr Butanox M-50 + 0.5 phr Accelerator NL-49P 3
2 phr Butanox M-50 + 1.0 phr Accelerator NL-49P
Pot life at 20°C Pot lives were determined of a mixture of Butanox M-50 and a non- preaccelerated UP resin at 20°C. 2 phr Butanox M-50 Butanox M-50 is miscible with phthalates and slighthly miscible with water.
Butanox M-50 is available in the colors blue, yellow-A, red-YM and red-YM 1/6. Butanox and Nourytainer are registered trademarks of Akzo Nobel Chemicals BV or affiliates.
All information concerning this product and/or suggestions for handling and use contained herein are offered in good faith and are believed to be reliable. Akzo Nobel Polymer Chemicals, however, makes no warranty as to accuracy and/or sufficiency of such information and/or suggestions, as to the product's merchantability or fitness for any particular purpose, or that any suggested use will not infringe any patent. Nothing contained herein shall be construed as granting or extending any license under any patent. Buyer must determine for himself, by preliminary tests or otherwise, the suitability of this product for his purposes. The information contained herein supersedes all previously issued bulletins on the subject matter covered. The user may forward, distribute, and/or photocopy this document only if unaltered and complete, including all of its headers and footers, and should refrain from any unauthorized use. You may not copy this document to a website.
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Product Data Sheet 
Pot life at 20°C